UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

For the fiscal year ended December 31, 2022

OR

Commission File Number: 001-39979

VOR BIOPHARMA INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (617) 655-6580

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐ No ☒

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes ☐ No ☒

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of June 30, 2022, the last day of the registrant’s most recently completed second fiscal quarter, the aggregate market value of the registrant's common stock, $0.0001 par value per share (“Common Stock”), held by non-affiliates of the registrant was approximately $115,730,496 based upon the closing price of the Common Stock on June 30, 2022.

The number of shares of registrant’s Common Stock outstanding as of March 17, 2023 was 66,373,784.

Table of Contents

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Note Regarding Company References

Throughout this Annual Report on Form 10-K (“Annual Report”), the “Company,” “Vor,” "Vor Bio," “Vor Biopharma Inc.,” “we,” “us,” and “our,” except where the context requires otherwise, refer to Vor Biopharma Inc. and its consolidated subsidiary, and “our board of directors” refers to the board of directors of Vor Biopharma Inc.

Special Note Regarding Forward-Looking Statements and Industry Data

This Annual Report contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts, contained in this Annual Report, including statements regarding our strategy, future operations, future financial position, future revenue, projected costs, prospects, plans, and objectives of management, are forward-looking statements. In some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “would,” “expect,” “plan,” “anticipate,” “could,” “might,” “intend,” “target,” “ongoing,” “project,” “estimate,” “believe,” “estimate,” “predict,” “potential” or “continue” or the negative of these terms or other similar expressions intended to identify statements about the future. These statements speak only as of the date of this Annual Report and involve known and unknown risks, uncertainties and other important factors that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by the forward-looking statements. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition and results of operations. These forward-looking statements include, without limitation, statements about:

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You should read this Annual Report and the documents that we have filed as exhibits to this Annual Report completely and with the understanding that our actual future results may be materially different from what we expect. The forward-looking statements contained in this Annual Report are made as of the date of this Annual Report, and we do not assume any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law. We have included important factors in this Annual Report, particularly in the “Summary Risk Factors” and “Risk Factors” sections, that could cause actual results or events to differ materially from the forward-looking statements that we make.

This Annual Report includes statistical and other industry and market data, which we obtained from our own internal estimates and research, as well as from industry and general publications and research, surveys, and studies conducted by third parties. Industry publications, studies, and surveys generally state that they have been obtained from sources believed to be reliable, although they do not guarantee the accuracy or completeness of such information. While we believe that each of these studies and publications is reliable, we have not independently verified market and industry data from third-party sources. While we believe our internal company research is reliable and the market definitions are appropriate, neither such research nor these definitions have been verified by any independent source.

Summary Risk Factors

Our business is subject to a number of risks that if realized could materially affect our business, financial condition, results of operations, cash flows and access to liquidity. These risks are discussed more fully in the “Risk Factors” section of this Annual Report. Our principal risks include the following:

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PART I

Item 1. Business.

Overview

Vor Bio is a clinical-stage company with a vision to cure blood cancers through cell and genome engineering. Our mission is to change the standard of care for patients with blood cancer by engineering hematopoietic stem cells (“HSCs”) to enable the use of targeted therapies post-transplant.

Our initial focus is on patients suffering from acute myeloid leukemia (“AML”). For many of these patients, hematopoietic stem cell transplant (“HSCT”) is the standard of care treatment and the only way to achieve durable remission or a cure. Despite undergoing HSCT, approximately 40% of patients experience a relapse of their cancer and subsequently face an extremely poor prognosis, with two-year survival rates of less than 20%.

The traditional tumor targeting approach to treating blood cancers such as AML focuses on cancer cells expressing a target antigen. However, very few targets are tumor-specific, as healthy cells usually express these same target antigens alongside cancer cells. While technologies may improve the specificity of target antigen binding or enhance potency, these approaches are subject to the same fundamental biological limitation of killing healthy cells expressing these targets, known as on-target toxicity. A number of targeted therapies have failed in clinical development, and those that have succeeded possess limited utility and narrow applicability, in part due to their on-target toxicity.

Vor Bio’s proprietary platform aims to change the traditional target tumor approach by genetically engineering healthy cells by removing therapeutic targets, thereby enabling the use of targeted therapies post-transplant.

Changing the Thinking on Tumor Targeting

Leveraging our expertise in HSC biology and genome engineering, we genetically modify HSCs to remove surface targets and then provide these cells as hematopoietic stem cell transplants to patients. Once these cells engraft into bone marrow, the patient’s healthy cells should be protected because they no longer express the surface target, leaving only the cancerous cells exposed. We believe this will unlock the potential of targeted therapies to

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selectively destroy cancerous cells while sparing healthy cells. As a result, our engineered HSCs (“eHSCs”) are designed to limit the on-target toxicities associated with these targeted therapies, thereby enhancing their utility, and broadening their applicability.

A Novel Treatment Approach for Blood Cancers

We are developing our lead eHSC product candidate, tremtelectogene empogeditemcel (trem-cel), formerly VOR33, which we believe has the potential to transform the treatment for AML and other blood cancers. CD33 is a clinically validated target for AML, and we use genome engineering technology to remove CD33 surface targets from HSCs to create trem-cel. Data from preclinical studies from multiple independent laboratories, alongside data from human genetics databases, show that CD33 can be removed from HSCs without any deleterious impact on cell biology.

We have initiated VBP101, a Phase 1/2a clinical trial in patients with CD33-positive AML who are at high risk of relapse. The primary goals of the trial are to evaluate tolerability and feasibility of the trem-cel stem cell transplant, with a focus on confirming that trem-cel can engraft normally. Following engraftment, patients are eligible to be treated with Mylotarg®, a CD33-directed antibody drug conjugate (“ADC”) therapy, in order to potentially prolong leukemia-free survival and provide evidence that trem-cel protects against the myelosuppression that typically accompanies treatment with Mylotarg. Initial clinical data from one patient from VBP101 showed trem-cel exhibited robust engraftment five months post-transplant through multiple cycles of Mylotarg, at the initial dose level.

Our proprietary eHSC technology is designed to confer advantages and address several limitations associated with existing cell therapy processes. Our manufacturing of eHSCs is a fast and elegant process that leads to a rapid vein-to-vein time which we believe can easily integrate into existing standard of care. Additionally, preclinical studies of trem-cel demonstrated a high degree of genome engineering precision with highly reproducible results across multiple independent healthy donors, which we have now replicated across large-scale clinical batches.

We intend to pair future eHSC product candidates with targeted therapeutics such as our VCAR33 programs, chimeric antigen receptor (“CAR”)-T therapies designed to target CD33, as well as with potentially best-in-class targeted therapies from collaborators, to bring potentially transformative outcomes to patients and establish new standard of care Treatment Systems for blood cancers.

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We believe that the combination of trem-cel followed by treatment with VCAR33ALLO, our in-house CD33-directed CAR-T program, which we refer to as the trem-cel + VCAR33 Treatment System, in the post-transplant setting has the potential to transform patient outcomes and may offer the potential for cures for patients that have limited treatment options. The Treatment System would utilize the same healthy donor allogenic cell source for both trem-cel and VCAR33ALLO. We plan to collect initial data on trem-cel from the VBP101 clinical trial and initial clinical data from the first-in-human trial studying the VCAR33ALLO program prior to the Investigational New Drug (“IND”) submission for the Treatment System. We believe this approach may allow for a methodical development pathway for this novel-novel treatment combination.

We are also pursuing our first multi-targeted CD33-CLL1 Treatment System comprising a CD33-CLL1 multiplex-edited eHSC therapy and a CD33-CLL1 multi-specific CAR-T therapy. These next-generation, multiplex-edited eHSCs may enable a wide range of treatment options post-transplant, including the use of multi-specific CAR-T therapies.

We believe our proprietary technology has broad applicability beyond CD33, including targets such as CD123, EMR2, and CD5. Leveraging our platform, we are rapidly advancing the creation and preclinical testing of multiplex-engineered eHSCs, in which multiple surface targets are removed, potentially obviating concern around tumor heterogeneity and potential escape mechanisms.

Acute Myeloid Leukemia Overview

AML is the most common type of acute leukemia in adults and is characterized by excessive proliferation of myeloid stem cells and their failure to properly differentiate into mature blood cells. There are an estimated 42,500 new diagnoses of AML each year in the United States, Europe and Japan. The median five-year survival rate for patients with AML is less than 30%, but there are significant differences in prognosis depending on several factors, including the age of the patient at diagnosis.

Current first-line treatments for patients with AML typically involve aggressive combination chemotherapy regimens with the goal of inducing disease remission long enough to allow the patient to undergo a potentially curative HSCT. The recommended treatment for AML for patients younger than 60 years and for older patients who can tolerate intensive chemotherapy is a regimen referred to as 7+3, involving seven days of continuous dosing with the chemotherapy agent cytarabine along with short infusions of the chemotherapy agent daunorubicin on days one through three. These induction chemotherapy regimens are usually not curative, and without post-remission therapy such as HSCT, AML is likely to return within several months.

Following successful induction chemotherapy and prior to HSCT, patients undergo myeloablation, a procedure designed to eliminate more of the remaining tumor cells, but one that also leads to the destruction of the patient’s HSCs. These HSCs are then replaced using cells from a matched healthy donor, resulting in reconstitution of the patient’s hematopoietic system.

Over the past 20 years, there has been an increasing trend in HSCTs for AML patients with over 16,000 allogeneic HSCT procedures performed in the United States between 2013 and 2017. AML was the most common disease treated by allogeneic HSCT, representing over 35% of all allogeneic HSCT procedures performed during this time period.

Unfortunately, in approximately 40% of AML patients who undergo HSCT, some tumor cells persist, and the patient’s cancer relapses. As shown in the figure below, AML patients treated with HSCT who were identified prior to HSCT as high risk of relapse, given presence of Minimal Residual Disease (“MRD”) biomarkers or active disease in bone marrow samples, or had MRD had an even higher relapse rate of 67%, with the vast majority of these patients relapsing within one year. Patients who had MRD negative disease, meaning that the number of tumor cells had been reduced to a level of approximately 0.1% of cells in a bone marrow sample, had a much lower and slower risk of relapse.

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Myeloid Cancer Unmet Need is Large and Increasing

Following HSCT, patients have very few treatment options and generally receive no treatment despite being high risk of relapse, since anti-cancer therapies will compromise the integrity of the new HSCT. This includes the use of targeted therapies such as Mylotarg, where on-target toxicity may compromise the new bone marrow cells. Unfortunately, due in part to stagnant innovation in HSCT and limited post-transplant treatment options, the post-transplant survival for AML patients is approximately 44%, based on AML outcomes in the National Cancer Database from 1998 to 2011. Approximately 10,000 patients in the United States die from AML each year.

Our Strategy

Our mission is to change the standard of care for patients with blood cancer by engineering HSCs to enable use of targeted therapies post-transplant. Our strategy to accomplish this mission is as follows:

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Clinical data generated from the VCAR33AUTO and VCAR33ALLO programs may inform the

development of important new therapies for patients with relapsed/refractory AML. In addition,

these programs will collect important safety and efficacy data to inform the Treatment Systems

discussed below.

Our Approach—Engineering Hematopoietic Stem Cells to Enable Targeted Therapies Post-Transplant.

Our proprietary platform aims to change the traditional approach to tumor targeting by removing target expression from healthy cells, thereby engineering the patient’s cells to improve the tumor specificity of targeted therapies. We accomplish this by genetically modifying healthy donor HSCs to remove select cell surface targets. By removing these targets, we make these donor HSCs and their progeny treatment-resistant to targeted therapies and enable these treatments to selectively destroy cancerous cells while sparing healthy cells. As a result, our eHSCs are designed to limit the on-target toxicities associated with these targeted therapies, thereby enhancing their utility and broadening their applicability. We believe that combining our eHSCs and targeted therapies, such as CAR-Ts, bispecific antibodies, and ADCs, has the potential to transform the treatment of blood cancers, such as AML.

Our Proprietary Vor Bio Platform

We have built a technology platform to realize our vision that allows for selective cancer targeting with highly potent targeted therapies by leveraging our expertise and recent advances in stem cell biology and genome engineering. Our approach is in stark contrast to conventional approaches that have focused solely on developing the therapeutic and have faced clinical limitations due to toxicities. The key components of our proprietary Vor Bio platform are the following:

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Our goal is to replace the patient’s HSCs with next-generation, treatment-resistant eHSCs that unlock the potential of highly potent targeted therapies by leveraging our platform and expertise. Our platform is adaptive and has the potential to engineer cells, whether autologous or allogeneic, whether collected from mobilized peripheral blood stem cells, bone marrow or cord blood-derived stem cells, and with any human leukocyte antigen (“HLA”) matching strategy, such as complete, incomplete or haploidentical matches. We also believe that our eHSCs could be used with any specific conditioning regimen and believe our platform could be used with either myeloablative or reduced-intensity conditioning regimens.

Vor Bio’s Novel Technology Platform

Advantages of Our eHSC Technology and Manufacturing Process

Our eHSC technology is designed to confer advantages and address limitations associated with existing cell therapy processes.

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Vor Bio Streamlined Manufacturing Process

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Our Pipeline

Our pipeline of eHSC and CAR-T programs is shown below:

AML: acute myeloid leukemia; MDS: myelodysplastic syndrome; MPN: myeloproliferative neoplasm

*The VCAR33AUTO construct is being studied in a Phase 1/2 clinical trial sponsored by the NMDP, and timing of data release is dependent on the investigators conducting the trial.

Our Programs

Trem-cel for the Treatment of Blood Cancers

Overview

Trem-cel is our lead eHSC product candidate created by genetically modifying healthy donor HSCs in order to remove the CD33 surface target. We intend to develop trem-cel as an HSCT product candidate to replace the standard of care in transplant settings. Once the trem-cel cells have engrafted, we believe that patients can be treated with anti-CD33 therapies, such as Mylotarg or our CAR-T therapy product candidates, with limited on-target toxicity. We have initiated VBP101, a Phase 1/2a clinical trial in patients with CD33-positive AML who are at high risk of relapse.

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VBP101 Clinical Trial

Our IND application for trem-cel in patients with AML was accepted by the U.S. Food and Drug Administration ("FDA") in January 2021, and we have initiated VBP101, our first-in-human Phase 1/2a trial of trem-cel in combination with Mylotarg.

Trem-cel has received Fast Track designation for the treatment of AML from the FDA, allowing for potential facilitated development and expedited review process, and Orphan drug designation (“ODD”), which is granted by the FDA to a drug or biologic intended to treat a rare disease or condition that affects fewer than 200,000 individuals in the U.S. ODD granted therapies entitle companies to development incentives including tax credits for clinical testing, prescription drug user fee exemptions, and seven-year marketing exclusivity in the event of regulatory approval.

The clinical strategy for trem-cel is to initially evaluate engraftment and tolerability, then assess clinical activity in subsequent clinical trials.

The primary goals of the VBP101 trial are to evaluate tolerability and feasibility, with a focus on confirming that trem-cel can engraft in patients in a timely manner. Patients will then be eligible for subsequent treatment with Mylotarg. While this trial is not designed to evaluate the efficacy of the combination of trem-cel and Mylotarg, we may generate data on the incidence of the previously documented hematopoietic toxicities associated with Mylotarg. Any observed protection from such on-target toxicity in this Phase 1/2a trial would serve as an important proof of principle for our research and development platform.

The VBP101 clinical trial is enrolling CD33-positive AML patients who are at a high risk of relapse. We have started our screening process with patients who have achieved morphologic remission, which means they have no detectable AML blasts in peripheral blood. As part of routine clinical practice, genetic profiling is also used to identify those patients who have disease markers associated with a high risk of disease relapse, such as MRD status. After the primary disease in these patients is put into remission, we expect a substantial number of patients will have MRD or other disease markers showing high risk of relapse and therefore will be candidates for trem-cel.

To administer trem-cel, HSCs from matched healthy donors are isolated, engineered into trem-cel and then introduced into patients following myeloablative conditioning. We expect that engraftment of trem-cel will occur within 28 days of administration, which occurs in over 90% of standard HSCT procedures. As a safety measure, we freeze and preserve a portion of the original donor cells to use in case of the failure of trem-cel to engraft. At day 60, we re-evaluate patients for disease status. Those patients with successful trem-cel grafts who experience relapse of their AML will then become eligible to be treated with therapeutic doses of Mylotarg. Other patients are treated with maintenance doses of Mylotarg once a month for four months to address any remaining MRD.

We expect the key analytical and clinical read-outs of the VBP101 clinical trial to include the following:

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Initial Clinical Data from the VBP101 Clinical Trial

In December 2022, we reported initial clinical data on the first patient (Patient 1) treated in the VBP101 trial; the patient was successfully transplanted with trem-cel and tolerated Mylotarg.

A product dose of 7.6 x106 CD34+ viable cells/kg, with a CD33 editing efficiency of 88% was manufactured. Following myeloablative conditioning, trem-cel was infused with no infusion reactions. The patient achieved neutrophil engraftment 10 days post-transplant which was within expectations for CD34-enriched transplants. Platelet recovery was observed on Day 22. Hematopoietic cell sub-population reconstitution was robust with over 90% of peripheral blood cells negative for CD33 expression, and 100% donor chimerism was achieved. These data provide proof-of-concept that trem-cel can engraft as expected and that CD33 does not appear to be biologically necessary for engraftment and hematopoietic reconstitution.

As of the last clinical data cut on February 6, 2023, (data presented at the 2023 TANDEM Meetings), neutrophil and platelet cell counts were maintained in Patient 1 approximately five months (147 days) after transplantation with trem-cel and following three sequential Mylotarg doses at 0.5 mg/m2. This suggests potential protection from Mylotarg-related hematotoxicity. The only adverse event observed possibly related to Mylotarg through dose 3 was low grade nausea and vomiting, a known side-effect of Mylotarg. Mylotarg first-dose pharmacokinetics revealed 0.5 mg/m2 achieved Cmax and AUC parameters equivalent to 1-2 mg/m2 and 4-5 mg/m2 accordingly, potentially due to the decreased CD33 antigen sink. Due to detectable MRD, Patient 1 was moved to other therapies following administration of the third dose of Mylotarg, subsequently relapsed, and remains on study for long-term follow-up.

In Patient 1, CD33-negative donor hematopoiesis was enriched across hematopoietic cell types following Mylotarg administration. In addition, the CD33 deletion was observed in donor cells of myeloid and lymphoid origin which were both enriched following Mylotarg, suggesting that CD33 is expressed in early hematopoietic cells and that Mylotarg treatment enriches for edited donor cells.

Patient 1 maintained neutrophil and platelet counts approximately five months (147 days) after transplantation with trem-cel. Due to detectable MRD, Patient 1 was moved to other therapies following administration of the third dose of Mylotarg, subsequently relapsed, and remains on study for long-term follow-up. Consistent with results from Patient 1, Patient 2 successfully received a trem-cel transplant and showed robust cell recovery with neutrophil engraftment occurring at Day 11 and platelet recovery on Day 17. Trem-cel was well tolerated, with no related and no unexpected adverse events (AEs) reported. Trem-cel was manufactured with 87% CD33 gene editing efficiency and the patient’s trem-cel dose was 3.2 x 106 CD34+ cells/kg.

Interest in enrollment in VBP101 continues to be strong with a high level of investigator enthusiasm at all nine study sites. We are moving forward with dose escalation of Mylotarg per the 3+3 dose escalation schema in the protocol and expect to report additional data by year-end 2023.

CD33 Targeted Therapies

A number of biologics investigated by third parties as potential therapeutics in AML and other hematopoietic malignancies have been based on targeting CD33, which, as shown in the figures below, is expressed, on average, in between approximately 85 to 90% of bulk AML patient samples and over 75% of leukemic stem cells.

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Rate of expression in bulk AML patient samples and leukemic stem cells

CD33 is an attractive target for the development of AML therapeutics based on preclinical and clinical results from third parties demonstrating the ability of anti-CD33 directed therapies to deplete tumor cells. However, CD33-directed therapeutic approaches have had limited impact in improving the prognosis of patients with AML due in part to on-target toxicity. This on-target toxicity can have myelosuppressive effects, such as neutropenia, which is an abnormally low number of certain white blood cells, and thrombocytopenia, which is an abnormally low number of platelets. A summary of the historic experience following a single dose of Mylotarg is shown below.

The only CD33 targeted therapy approved by the FDA for the treatment of AML is gemtuzumab ozogamicin (“GO”), which is marketed by Pfizer under the brand name Mylotarg. Mylotarg is an ADC that targets CD33 on AML cells and is designed to deliver a potent cytotoxin directly to tumor cells. However, due to the expression of CD33 on a broad set of hematologic progenitor cells, Mylotarg not only attacks AML cells, but it also depletes healthy blood cells, including HSCs and other progenitor cells that express CD33. Primarily due to its toxicity profile, Mylotarg is currently used only in a limited setting, in both first line and relapsed/refractory disease. Without a solution to the problem of CD33 on-target toxicity, we expect all CD33-targeted therapies to produce thrombocytopenia and neutropenia which may result in the same limited clinical utility as Mylotarg.

We believe engineering the patient to remove CD33 is a unique approach designed to protect from on-target toxicity and unlock the potential of CD33 as a therapeutic target. By removing CD33 expression in healthy cells, we expect to render these cells and their progeny treatment resistant to CD33-directed therapies, thereby providing robust protection from these therapies’ cytotoxic effects.

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Trem-cel Preclinical Data

Preclinical Proof of Concept

In preclinical studies, we observed the resistance of our eHSCs to Mylotarg. As shown in the figure below, we used in vitro cytotoxicity assays to measure the effects of various concentrations of Mylotarg on HSCs and their progeny (collectively, “HSPCs”) that have differentiated into myeloid lineage cells. We tested both wild type cells whose CD33 surface targets had not been manipulated (“CD33WT”) and cells that we had genetically engineered to remove CD33 (“CD33Del”). We observed that CD33Del cells had an approximately 70-fold increase in IC50 in comparison to CD33WT cells and, as expected, observed few differences in cell killing at extreme Mylotarg concentrations.

Mylotarg Cytotoxicity on CD33WT and CD33Del HSPCs

This was consistent with results from in vivo studies in which human HSPCs were engrafted for 16 weeks into 15 immune-compromised mice, with 15 mice used as a vehicle treated (“Vh”) control group. We investigated the impact of Mylotarg on CD14+ monocytes derived from these human HSPCs since CD14+ monocytes naturally express CD33 on their surface. As shown in the figure below, we observed that in the vehicle-treated groups, there was significant loss of CD14+ cells, while that population of cells was largely intact in the CD33Del arm, leading to a 61-fold higher CD14+ cell frequency in the CD33Del arm compared to the mock electroporated arm. These studies provide evidence of the resistance of CD33Del eHSCs and progeny to anti-CD33 therapies.

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CD33WT and CD33Del HSC survival after exposure to Mylotarg

Removal of CD33—No Observed Impact on Biology

Data from preclinical studies from multiple independent laboratories, alongside data from human genetics databases, show that CD33 can be removed from HSCs without any deleterious impact on cell biology.

The in vivo study below shows engraftment of human HSCs into 15 immune-compromised mice, with 15 mice used as a vehicle treated control group. Following 16 weeks of engraftment, CD33Del eHSCs and CD33WT control cells differentiated into various classes of blood cells, which allowed detection of these cells and functional assays of differentiated cells. We observed statistically significant (p<0.0001) lower rates of CD33 surface proteins, suggesting successful genome engineering in CD33Del cells. As shown in the other figures below, we observed no statistically significant differences in the number of cells by cell type produced by the CD33WT and CD33Del HSCs.

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16-week xeno-transplant mouse model engraftment data of human CD33-engineered cells

In order to observe the in vitro functionality of differentiated immune cells derived from eHSCs, we compared the ability of cells differentiated from CD33WT and CD33Del cells to phagocytose or produce cytokines. No differences in function were observed.

Cells derived from CD33Del eHSCs and CD33WT HSCs demonstrate intact functionality

In addition to data generated by us, academic laboratories at Columbia University, the University of Pennsylvania, and the Fred Hutchinson Cancer Research Center have each conducted similar experiments in vitro and in vivo with very similar findings, showing that no deleterious effects can be observed from replacing existing blood cells with CD33Del cells.

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Preclinical Validation of CD33 Deletion in HSCs

While these preclinical data offer encouraging evidence of the non-essential nature of CD33, we believe the strongest support for our approach comes from existing human genetics data. We have found 65 individuals with homozygous loss of function mutations in the CD33 gene using the genetic database maintained by the Broad Institute. More recently, we identified 176 individuals with homozygous loss-of-function mutations in CD33 through the database maintained by the UK Biobank. This critical evidence suggests the non-essential nature of CD33 function in humans, and we published a white paper in January 2023 in Cell & Gene outlining our analysis of this data to inform our approach. We believe this finding of so-called “null mutants” among the adult human population, combined with the lack of discernable in vitro and in vivo effects observed with the removal of CD33, mitigates concerns associated with introducing CD33Del eHSCs in humans.

Trem-cel with Other Targeted Therapies

Mylotarg is currently the only anti-CD33 therapy approved by the FDA. We believe that other anti-CD33 therapies that are not yet approved, such as our VCAR33 product candidates or bispecific antibodies, may ultimately be better targeted therapies due to higher expected potency and target specificity. Different therapeutics may also be more suitable in various clinical settings and disease states. We therefore plan to support research and development efforts studying the benefits of trem-cel and other eHSC approaches with several targeted therapies using different treatment modalities. This strategy is intended to optimize the potential for trem-cel and other eHSC programs to eventually become a new standard of care in transplantation, unlocking the potential of multiple targeted therapies for patients with AML and other blood cancers.

Trem-cel and Myelodysplastic Syndrome and Myeloproliferative Neoplasm

Other blood cancers overexpress CD33, including myelodysplastic syndrome (“MDS”) and myeloproliferative neoplasms (“MPNs”). MDS consists of a spectrum of bone marrow cancers that are characterized by reduction in blood cell counts and an increase in immature blood cells in bone marrow. This condition evolves into AML in up to 30% of cases. Similarly, MPNs are a group of blood cancers such as chronic myelogenous leukemia, chronic neutrophilic leukemia, polycythemia vera, primary myelofibrosis and essential thrombocythemia where excessive fully differentiated blood cells are produced by the bone marrow, and these conditions may also evolve into more aggressive AML. Patients with these conditions can be segmented into different risk categories based on cell counts and cytogenetics, with intermediate- or high-risk patients often treated with HSCT, and together MDS and MPN are the most common indications for allogeneic HSCT outside of AML. Scientific evidence produced by third parties shows that blast cells responsible for MDS and MPN express CD33 and other myeloid cell surface targets. We believe trem-cel has the potential to provide a therapeutic window that enables anti-CD33 therapies to be effective in

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those settings, and we are exploring the potential use of trem-cel in combination with targeted therapies in these indications.

VCAR33 for the Treatment of Blood Cancers

Overview

VCAR33 is a CAR-T therapy designed to target CD33, a clinically-validated target for AML. VCAR33 uses a CAR moiety that recognizes CD33 on the outside of the cell surface using the huM195 CD33 binder. The same binder was used in lintuzumab, which is an agent that has been tested in clinical trials and demonstrated clinical activity. We licensed VCAR33 from the U.S. Department of Health and Human Services, as represented by National Cancer Institute (“NCI”) of the National Institutes of Health (“NIH”). We are studying VCAR33 with autologous and allogeneic cell sources.

Preclinical Proof of Concept

The NIH conducted preclinical studies to assess the ability of various CAR-T constructs, including a construct using the huM195 binder, to clear human AML tumor cells implanted in mice. These CAR-T constructs, as well as a saline solution and untransduced T cells used as controls, were administered to mice that were then observed over the course of a 10-week period. As shown in the figure below, the constructs containing the 4-1BB costimulatory domain were less active against the AML cells than those containing CD28. In addition, in other studies, the NIH noted toxicity signals in CAR constructs containing the hP67.6 binder, which is the same binder used in Mylotarg. As a result, the NIH chose to take the construct using the huM195 binder and CD28 costimulatory domain into clinical development.

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Tumor cell clearance of CAR constructs in mouse xenograft models

VCAR33ALLO Clinical Development

We plan to study VCAR33ALLO in a Phase 1/2 clinical trial that will run in two phases: the first phase, which is expected to enroll approximately 12 patients, is designed to determine the maximum tolerated dose of VCAR33ALLO using a 3+3 trial design; the second phase, which is expected to enroll up to 12 patients, is an expansion phase designed to evaluate the rate of clinical response to treatment. VCAR33ALLO could cause bone marrow failure due to the elimination of normal hematopoiesis in the absence of an approach that limits on-target toxicity, and therefore, the clinical trial is studying VCAR33ALLO in the bridge-to-transplant setting, where bone marrow failure is manageable with subsequent transplant. Patients are monitored for safety endpoints associated with CAR-T therapy including evidence of cytokine release syndrome, hepatotoxicity and neurotoxicity. Since VCAR33ALLO uses T cells sourced from a healthy donor, there may be additional risk of these T cells attacking the patient called graft versus host disease, and incidence of this will be monitored in the trial. In addition, treatment-related mortality and time to engraftment, will be assessed post-HSCT to determine the safety of VCAR33ALLO in combination with the transplantation procedure. We plan to submit an IND for this clinical trial in the first half of 2023.

We anticipate the key clinical efficacy endpoints of the trial being the reduction of the blast count in the bone marrow to achieve a morphologic remission, assessment of the elimination of MRD by flow cytometry or molecular methods and the percent of patients consequently able to proceed to a potentially curative HSCT. Standard transplant-related outcomes of the trial including overall survival, relapse rates and event-free survival will be

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measured. Exploratory objectives will assess VCAR33ALLO performance in patients including expansion and persistence within the blood and bone marrow.

Our Solution to Transform Patient Outcomes: The Trem-cel + VCAR33 Treatment System

We believe trem-cel could unlock the potential of anti-CD33 therapies that are much more potent than Mylotarg. We believe VCAR33ALLO could be a highly potent anticancer therapy that, when combined with trem-cel, would not be associated with severe myeloablative toxicities. We believe the trem-cel + VCAR33 Treatment System is a novel and comprehensive approach that has the potential to transform clinical outcomes and establish a new standard of care for patients suffering with AML.

An attractive feature of this Treatment System is to use the same allogeneic source of cells for both the eHSC and CAR-T. In this scenario, the apheresis product from the healthy donor can be processed to serve as starting materials for both products. One advantage of this approach is that donor-derived T cells should not recognize CAR-T cells as foreign, potentially prolonging persistence. In addition, sourcing T cells from healthy donors may provide a healthier, more abundant cell source, allowing for optimizations and efficiencies in the manufacturing process that are not possible with autologous sources. Unlike autologous CAR-T therapies, the manufacturing of the CAR-T cells would not be rate limiting when combined with trem-cel, as the CAR-T therapy would not be needed until 60 days after administration of trem-cel.

Trem-cel + VCAR33 Treatment System—Clinical Development

We intend to submit an IND application with the FDA and conduct a clinical trial of the trem-cel + VCAR33 Treatment System after we obtain the initial results from our trem-cel Phase 1/2a clinical trial and our planned VCAR33ALLO Phase 1/2 monotherapy clinical trial. We believe demonstration of disease clearance activity by VCAR33ALLO would provide a fundamental rationale for further development in a non-relapse/refractory population which is still high risk, including patients with poor prognostic molecular markers and/or MRD positivity. We would evaluate VCAR33ALLO in a post-trem-cel transplant setting to reduce the risk of recurrence or treat evidence of early relapse. Through use of trem-cel, we believe VCAR33ALLO could be used in a post-transplant maintenance setting since CD33 negative hematopoiesis established by the trem-cel graft would be protected from eradication. The objective of this trial would be to assess the safety and initial clinical efficacy of the trem-cel + VCAR33 Treatment System.

Ongoing Preclinical Programs

We believe our approach can extend beyond CD33 where targets fulfill three important criteria: firstly, these targets are expressed on cancer cells; secondly, these targets are expressed on cells of hematopoietic lineage (and therefore present a safety concern); and lastly there is evidence these protein targets are biologically dispensable. We have generated preclinical data exploring targets such as CD123, EMR2, and CD5 which all currently show promise fulfilling these criteria.

Other Myeloid Targets: CD123, CLL-1, EMR2

CD123, CLL-1, and EMR2 are targets expressed strongly in various myeloid blood cancers including AML. These targets are expressed both in bulk AML cells as well as leukemic stem cells. As shown in the figure below, we have the ability to genetically engineer HSCs in human cells to remove expression of these targets with good efficiency. As such, we continue to research these targets as potential target candidates for our eHSCs and CAR-T therapies.

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High Editing Frequency Observed in Human CD34+Cells for CD123, CLL-1 and EMR2

Multiplex Engineering: High Editing Efficiency Across CD123, CLL-1, and EMR2 Targets

Multiplex engineering is a strategy and method where multiple genetic targets are engineered within the same cells in the same manufacturing process. Multiplex engineering could allow removal or modification of two or more distinct genes, thus allowing for targeted therapies directed at two or more separate targets to be used in combination or in sequence, which could be particularly valuable to prevent escape mechanisms involving tumor cells down-regulating target expression.

We have developed several techniques for multiplex engineering HSCs. One such technique is sequential Cas9 editing, where HSPCs are subject to a two separate Cas9 edits separated by a defined time period in order to allow the first edit to complete before applying the second edit. This separation is important to avoid translocation errors, which are gene repairs resulting in one DNA segment joining other DNA segments from different parts of the same chromosome or segments of other chromosomes. As seen in the chart below left, we can efficiently knock out expression of both CD33 and CLL-1 from HSPCs using this technique.

Another technique involves a technology called base editing, which involves converting a specific DNA base into another at a targeted genomic locus. As such, base editing does not require a cut, lowering the risk of translocation errors. As seen in the chart on the below right, we can efficiently knock out expression of both CD33 and CLL-1 from HSPCs using a single base editing step.

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Our expertise in multiplex engineering allowed us to make progress on a new program called the CD33-CLL1 Treatment System. This Treatment System is made up of the CD33-CLL1 multiplex-engineered eHSC and the CD33-CLL1 multi-specific CAR-T.

In vitro proof of concept for this approach is shown below. In this experiment we compared the survival of wild type, CD33Del, CLL-1Del and CD33Del+CLL-1Del cell lines when simultaneously exposed to CD33 and CLL-1 CAR-T treatments. We observed statistically significant higher survival of cell lines with protein removals corresponding to the CAR-T targets, with the highest survival in the cell line lacking both CD33 and CLL-1 surface targets. These results suggest that the removal of these surface targets provided protection of the cell lines from the target-specific effects of the CAR-T therapy.

A multiplex approach may provide advantages in two areas. Firstly, target expression can vary in tumor cells from the same patient, a phenomenon known as tumor heterogeneity. Applying therapies such as a multi-specific CAR-T may reduce that concern. Secondly, it is theoretically possible for tumor cells to downregulate expression of a target to avoid being killed, a phenomenon known as tumor escape. Again, pursuing multiple targets simultaneously may reduce the effectiveness of the tumor escape mechanism.

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Survival of CD33Del and CLL-1Del cells after exposure to

anti-CD33 and anti-CLL-1 CAR-T therapies

Commercial Strategy and Reimbursement Framework for Our eHSCs and CAR-T Product Candidate

Given the potential value proposition of eHSCs enabling targeted therapies, our goal is to maximize the reach of our therapies, if approved, to all patients in the transplant setting suffering from blood cancers. Each year, approximately 42,500 new cases of AML are diagnosed across the United States (~20,000), Europe (~18,000) and Japan (~4,500). For the past 20 years, there has been an increasing trend in allogeneic transplants for AML. Currently, there are approximately 12,000 allogeneic HSCTs performed globally each year, with approximately 3,500 performed in the United States, 7,000 in Europe and 1,500 in Japan.

We believe we will be able to commercialize our eHSCs and targeted therapies, if approved, with a focused footprint where we can leverage the existing logistical infrastructure of the NMDP and HSC transplants centers. HSCTs are performed at tertiary medical care hospitals with specialized HSC transplant centers. The United States, EU5 and Japan have approximately 200, 300 and 185 transplant centers, respectively. The transplant volumes are further concentrated with 15%, or approximately 30 U.S. transplant centers, performing 50% of U.S. transplants. Building on a concentrated network of transplant centers, we have the added advantage of a rapid manufacturing process of <14 days. This turn-around time for collecting cells and shipping is a critical component of a successful commercialization.

As shown below, we believe that our platform and approach gives us the ability to transform the treatment paradigm for patients suffering from AML at each significant step in their journey by increasing transplant eligibility, replacing the standard of care for transplants, and unlocking the potential of targeted therapies post-transplant.

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Opportunity to Transform the Patient Journey

We believe multiple reimbursement pathways may be available in the United States to capture the value of eHSCs and targeted therapies, such as CAR-T. Effective for cost reporting periods beginning on or after October 1, 2020, under the Hospital Inpatient Prospective Payment System (“IPPS”), Medicare payment for HSCT will include a carve-out for the actual cost of stem cell acquisition and processing, and payment will instead be made on a reasonable cost basis. We believe this new rule may apply to innovative sources of donor stem cells like eHSCs. In addition, a new Medicare Severity Diagnosis-Related Group (“MS-DRG”) establishes a base payment rate of approximately $248,000 for CAR-T cases.

A potential alternative reimbursement pathway for eHSC is Medicare New Technology Add-on Payment (“NTAP”) which, if approved, allows for temporary reimbursement for new cell therapies above the standard MS-DRG payment threshold. When certain criteria are met, the Centers for Medicare & Medicaid Services (“CMS”), the federal agency responsible for administering the Medicare program, may provide incremental reimbursement for up to 65% of the cost of therapy in addition to the standard MS-DRG payment. For patients covered by commercial insurance, we believe that reimbursement will be based on a case rate methodology with provisions for separate payments for new therapies such as eHSC. Lastly, risk-sharing agreements or value-based purchasing models is another option that is becoming more common with novel cell and gene therapies.

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Potential Value Proposition and Reimbursement Pathways

License Agreements

Exclusive License Agreement with Columbia University

In April 2016, we entered into an exclusive license agreement with The Trustees of Columbia University in the City of New York (“Columbia”), which agreement was subsequently amended in February 2019 and November 2021 (the “Columbia Agreement”). Pursuant to the Columbia Agreement, we obtained a worldwide, exclusive license, with the right to grant sublicenses (subject to certain restrictions), under certain of Columbia’s patents, know-how and materials to discover, develop, manufacture, have made, use, sell, offer to sell, have sold, import, export, distribute, rent or lease products that are covered by such patents or involve the use of or otherwise incorporate such know-how or materials, in each case for any and all uses. The foregoing license is subject to certain customary retained rights of Columbia, including the right to conduct academic research and publish know-how. We are also obligated to use commercially reasonable efforts to research, discover, develop and market licensed products for commercial sale and distribution, including by achieving one or more specified diligence milestones.

Under the Columbia Agreement, we paid Columbia an upfront fee of $25,000 and issued to Columbia 91,911 shares of our common stock. We are also obligated to pay Columbia an annual fee in the low five digits, as well as royalties on net sales of products that are covered by the licensed patents ranging in the low single digits and on net sales of products that are not covered by the licensed patents but involve the use of or otherwise incorporate licensed know-how or materials ranging in the low single digits (which range is lower than the range for patented products), in each case with respect to such products sold by us but not our sublicensees. Royalties are payable on a patented product-by-patented product basis and country-by-country basis for such period as a valid claim covers such patented product in such country, which we expect to be until January 2040, absent any applicable patent term extensions, and, on an unpatented product-by-unpatented product and country-by-country basis for the longer of ten years from first commercial sale of such unpatented product in such country or expiration of any market exclusivity for such unpatented product in such country. If the royalty term for a patented product expires in a country and such product would otherwise qualify as an unpatented product in such country (and the applicable royalty term for such unpatented product has yet to expire in such country), then we are obligated to pay Columbia royalties for such unpatented product for the remainder of the royalty term in such country. Additionally, we are obligated to pay Columbia up to $4.45 million in the aggregate for certain clinical, regulatory and commercial milestones for the first two products, $2.0 million in the aggregate for certain commercial milestones for a single additional product incorporating certain of the intellectual property licensed to us under the Columbia Agreement and a mid-second decile percentage of consideration received from sublicensees, including royalties, provided that if such sublicensing income includes a milestone payment for which we are already obligated to make a milestone payment under the Columbia Agreement, then Columbia shall only be entitled to the higher of our milestone payment and its portion of the sublicensing income.

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The Columbia Agreement expires on a country-by-country and product-by-product basis upon expiration of the applicable royalty term for such product in such country. Columbia may either terminate the Columbia Agreement or convert our license to a non-exclusive license in the case of our insolvency, or upon our uncured material breach of the agreement of certain specified provisions, including in the event that we fail to achieve one or more specified diligence milestone(s) and fail to mutually agree upon a revised plan for development of a licensed product. Additionally, we have the right to terminate the Columbia Agreement at any time upon specified written notice to Columbia.

Exclusive License Agreement with National Institutes of Health

In October 2020, we entered into a patent license agreement (the “Patent License”) with the U.S. Department of Health and Human Services, as represented by National Cancer Institute (“NCI”) of the NIH. Pursuant to the Patent License, we hold an exclusive, worldwide license, sublicensable with the prior written consent of NIH, to certain intellectual property rights to develop, manufacture and commercialize licensed products, or to practice licensed processes, in each case, for use in the development of a CAR therapy mono-specific for CD33 for the prophylaxis or treatment of CD33-expressing hematological malignancies (but excluding CD33-specific logic-gated CAR-based immunotherapies) wherein the CAR is comprised of the CD33-binding domain referenced as Hu195 or hP67.6, is delivered via lentiviral transduction, and the T cells are derived from the patient or from an allogeneic source, which we collectively refer to as the field of use.

Pursuant to the terms of the Patent License, we are required to pay NCI a license issue fee in the aggregate amount of $400,000. The terms of the Patent License also require us to pay NCI de minimis minimum annual royalties, which royalties are creditable against earned royalties on sales of licensed products or licensed processes. We must also pay NCI tiered royalties on net sales of licensed products at rates ranging in the low single digits if the product CAR-T cells are derived from the patient, and at a higher range of rates in the low single digits if the product CAR-T cells are derived from an allogeneic source. Such royalties are payable on a licensed product-by-licensed product and country-by-country basis, commencing on the date of first commercial sale of such licensed product in such country, until the date such licensed product ceases to be covered by a valid claim of a licensed patent in such country, which we expect to occur in March 2039, absent any applicable patent term extensions, and are subject to reduction for unblocking licenses from third parties, subject to a specified royalty floor.

We are required to pay NCI one-time milestone payments upon successful completion of specified clinical and regulatory milestones relating to the licensed products. The aggregate potential milestone payments are $8.0 million. In addition, we are required to pay NCI one-time milestone payments following aggregate net sales of licensed products at certain net sales up to $2.0 billion. The aggregate potential amount of these milestone payments is $6.0 million. To the extent we enter into a sublicensing agreement relating to a licensed product, we are required to pay NCI a percentage of the non-royalty based consideration received from a sublicensee, with specified exclusions, which percentage ranges from the low single digits to low double digits, depending on the stage of development of the licensed product at the time of the sublicense. We are also required to reimburse NCI for its past patent expenses for the licensed patent rights, with such amounts being payable in three installments during the term of the Patent License, as well as our pro rata share of future patent expenses, in each case, in connection with NCI’s prosecution or maintenance of the licensed patent rights. We have the right to surrender our license rights in any country and will not be required to pay NCI for patent prosecution or maintenance expenses for any licensed patents for which we exercise such right.

We are required under the Patent License to use reasonable commercial efforts to bring the licensed products and licensed processes to practical application, which includes adhering to an agreed upon commercial development plan and meeting certain performance benchmarks. We are also required, commencing upon first commercial sale of a licensed product and for the remainder of the term of the Patent License, to use reasonable commercial efforts to make licensed products and licensed processes reasonably accessible to the U.S. public.

The Patent License will expire upon expiration of the last valid claim of a licensed patent, unless terminated earlier as described below. NCI may terminate the Patent License in the event of a material breach, including if we do not use reasonable commercial efforts to execute the commercial development plan, or if we do not achieve the performance milestones by certain dates, following the expiration of a 90-day notice period during which we must ether cure the relevant breach or initiate corrective action to NCI’s reasonable satisfaction. We may terminate the Patent License, in its entirety or with respect to any license in any country, in our sole discretion at any time upon 60 days’ written notice to NCI. In addition, NCI has the right to require us to grant sublicenses under the licensed

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patent rights in any of the fields of use under specified conditions, if required by public health or safety concerns, or to terminate or modify the Patent License if deemed necessary to meet requirements for public use as specified by federal regulations, if NCI determines that we are not reasonably satisfying such requirements.

We cannot assign the Patent License without NCI’s prior written consent, other than to our affiliates. Upon NCI’s approval of a proposed assignment, we must pay NCI a low-single digit percentage of the fair market value of any consideration we receive for such assignment.

Sales and Marketing

Given our stage of development, we have not yet established a commercial organization or distribution capabilities. We plan to build focused capabilities in the United States to commercialize our development programs focused on eHSCs and targeted therapies, where we believe the patient populations and medical specialists for the indications we are targeting are sufficiently concentrated to allow us to effectively promote our products, if approved for commercial sale, with a targeted sales team. In other markets for which commercialization may be less capital efficient where the patient populations and medical specialists are less concentrated we may selectively pursue strategic collaborations with third parties in order to maximize the commercial potential of our product candidates.

Manufacturing

We operate an in-house clinical manufacturing facility in Cambridge, Massachusetts to support development of our eHSC and CAR-T therapeutic candidates for patients with blood cancers. The facility is located in the same premises as our headquarters, in Cambridge, MA. We have designed the facility to support clinical manufacturing for our eHSC and cell therapy programs and to be cGMP compliant. By integrating our internal research, process development, analytical development, manufacturing, and quality control testing capabilities under one roof, we believe we can achieve flexible manufacturing capacity and reduce the time and cost required to manufacture our complex cell therapy clinical candidates. While this facility is now operational, we continue to rely on third-party contract manufacturers for our required raw materials, manufacturing devices, active pharmaceutical ingredients and finished product for our research and clinical manufacturing. We do not have long-term agreements with any of these third parties. We also do not have any current contractual relationship for the manufacture of material for clinical trials beyond Phase 1/2a or commercial supplies. We intend to enter into agreements with third-party contract manufacturers and one or more backup manufacturers for future production. Although we are developing certain in-house manufacturing capabilities for our current clinical needs, we continue to analyze the feasibility of building additional manufacturing capabilities for future development and commercial quantities of any products that we develop. Such products will need to be manufactured in facilities, and by processes, that comply with the requirements of the FDA and the regulatory agencies of other jurisdictions in which we are seeking approval.

Competition

The biotechnology industry is characterized by intense and dynamic competition to develop new technologies and proprietary therapies. Any product candidates that we successfully develop and commercialize will have to compete with existing therapies and new therapies that may become available in the future. We believe that our technology platform and our scientific and clinical expertise may provide us with competitive advantages. However, we face potential competition from various sources, including larger and better-funded pharmaceutical, specialty pharmaceutical and biotechnology companies, as well as from academic institutions, governmental agencies and public and private research institutions. Prior to approval, these entities may compete with us in hiring scientific and management personnel, establishing clinical study sites, recruiting patients to participate in clinical trials and acquiring technologies complementary to, or necessary for, our programs. Furthermore, key competitive factors will affect the success of any product that may be approved by regulators, including the efficacy, safety profile, pricing, method of administration and level of promotional activity of such product.

In the case of our lead eHSC product candidate, trem-cel, we are not aware of any approved products in development that apply gene engineering technology to donor HSCs in order to reduce the on-target toxicity of targeted cancer therapies. However, Cimeio Therapeutics is a private company that is pursuing a “cell-shielding technology” with “paired immunotherapies” approach to improve HSCTs that could be competitive although there are no known pipeline candidates for CD33. Researchers at the University of Pennsylvania (“UPenn”) have

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published the results of academic studies on gene engineering HSCs for this purpose, and UPenn has licensed intellectual property related to this approach to Tmunity Therapeutics Incorporated who merged with Kite Pharma in 2022. UPenn, Dana Farber, Heidelberg University Hospital and Beam Therapeutics have presented preclinical research engineering HSCs paired with a targeted therapy as a HSCT conditioning approach and/or treatment for hematopoietic malignancies. We are also aware of many companies that are attempting to address the problem of on-target toxicity through other treatment modalities, by attempting to improve the specificity of targeted therapies, including CD33-directed targeted therapies, for AML and other hematological cancer cells. For example, Johnson & Johnson and Amgen Inc. have CD33-directed bispecific antibodies in Phase 1 clinical development. There are also regulatable CD33 CAR-Ts being pursued by 2seventy bio, AvenCell, Aleta Biotherapeutics and Senti Biosciences. If any of these companies successfully develop effective targeted therapies for hematological malignancies without significant on-target toxicity, we believe they could compete with our eHSCs, including trem-cel.

In the case of VCAR33, there are several companies exploring CAR-T therapies in early trials for relapsed/refractory AML. City of Hope has opened a Phase 1 clinical trial treating relapsed/refractory AML using patient-specific donor-derived (allogeneic) CD33-CAR T cells which is a similar approach to VCAR33ALLO using donor-derived (allogeneic) CD33-CAR-Ts post-transplant. There are also a number of autologous CAR-Ts in clinical phase development to treat relapsed/refractory AML, including Precigen, Inc., which is studying the CD33 target; Kite Pharma and Baylor College are studying CLL-1; St. Jude Children's Hospital, UPenn, Mustang Bio, Inc. and Cellectis S.A. are investigating CAR-T therapies targeting CD123. There are also a number of CAR-T clinical studies open in China. Dual targeting CAR-T cell-based approaches are also being studied by iCell Gene Therapeutics, LLC, Guangzhou Bio-Gene and Legend Biotech Corporation, each of which target both CD33 and CLL-1.

Beyond CAR-T therapies, a number of small molecule and monoclonal antibody products have been approved in recent years for the treatment of AML, including Novartis International AG’s Rydapt (midostaurin), Jazz Pharmaceuticals plc’s Vyxeos (daunorubicin and cytarabine), Bristol-Myers Squibb Company’s Idhifa (enasidenib), Pfizer Inc.’s Mylotarg (gemtuzumab ozogamicin) and Daurismo (glasdegib), Agios Pharmaceuticals Inc.’s Tibsovo (ivosidenib), Astella Pharma Inc.’s Xospata (gilteritinib), and AbbVie Inc.’s Venclexta (venetoclax). Other treatment modalities, such as bispecific antibodies and antibody-drug conjugates are also in development across a wide range of targets. In addition, marketed therapies are being studied in the relapsed/refractory setting, including Bristol-Myers Squibb Company’s CC-486 oral formulation of azacitidine and AbbVie Inc.’s venetoclax.

Many of our current or potential competitors have substantially greater financial, technical and human resources. Accordingly, our competitors may be more successful in developing or marketing products and technologies that are more effective, safer or less costly. Additionally, our competitors may obtain regulatory approval for their products more rapidly and may achieve more widespread market acceptance. Future collaborations and mergers and acquisitions may result in further resource concentration among a smaller number of competitors. Smaller or early-stage companies may also prove to be significant competitors, either alone or through collaborative arrangements with large and established companies.

Intellectual Property

Overview

We strive to protect the proprietary product candidates and technologies that we believe are important to our business, including seeking and maintaining patent protection intended to cover the composition of matter of our product candidates, their methods of use, their methods of production, related technologies and other inventions. In addition to patent protection, we also rely on trade secrets to protect aspects of our business that are not amenable to, or that we do not consider appropriate for, patent protection, including certain aspects of technical know-how.

Our commercial success depends in part upon our ability to obtain and maintain patent and other proprietary protection for commercially important technologies, inventions and know-how related to our business, defend and enforce our intellectual property rights, particularly our patent rights, preserve the confidentiality of our trade secrets and operate without infringing valid and enforceable intellectual property rights of others.

The patent positions for biopharmaceutical companies like us are generally uncertain and can involve complex legal, scientific and factual issues. In addition, the coverage claimed in a patent application can be significantly reduced before a patent is issued, and its scope can be reinterpreted and even challenged after issuance.

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As a result, we cannot guarantee that any of our product candidates will be protectable or remain protected by enforceable patents. We cannot predict whether the patent applications we are currently pursuing will issue as patents in any particular jurisdiction or whether the claims of any issued patents will provide sufficient proprietary protection from competitors. Any patents that we hold may be challenged, circumvented or invalidated by third parties.

As of March 21, 2023, our owned patent portfolio is composed of more than 90 pending U.S. and foreign patent applications, approximately 8 pending U.S. provisional patent applications, and 6 granted U.S. patents. In addition, we have licensed 8 granted U.S. and foreign patents, and approximately 55 pending patent applications in the United States and foreign jurisdictions.

Patent Rights Relating to Our eHSC Programs

The patent portfolio related to our lead eHSC product candidate, trem-cel (formerly VOR33), includes four patent families that are exclusively licensed from Columbia. The first patent family licensed from Columbia is directed to compositions and methods for gene engineering lineage-specific cell surface antigens, such as CD33, in HSCs and use thereof, and includes eight granted U.S. and foreign patents, two pending U.S. applications and at least 13 pending foreign applications in Europe, Japan, Canada, China, Australia and other jurisdictions. Any patents that grant from applications claiming priority to this patent family would be expected to expire in 2036, absent any applicable patent term extensions.

As of March 21, 2023, the second patent family licensed from Columbia, directed to compositions and methods of use of HSCs containing a single nucleotide polymorphism in CD33, includes an allowed U.S. application and two pending foreign applications in Europe and Japan. Any patents that grant from applications claiming priority to this patent family would be expected to expire in 2038, absent any applicable patent term extensions.

As of March 21, 2023, the third patent family licensed from Columbia, directed to compositions and methods for gene engineering CD33 in HSCs and use thereof, includes a pending U.S. application and at least 14 pending foreign applications in Europe, Japan, Canada, China, Australia and other jurisdictions. Any patents that grant from applications claiming priority to this patent family would be expected to expire in 2040, absent any applicable patent term extensions.

As of March 21, 2023, the fourth patent family licensed from Columbia, directed to compositions and methods for inhibition of lineage-specific cell antigens using CRISPR-based base editor systems in HSCs and use thereof, includes a pending U.S. application and at least 8 pending foreign applications in Europe, Japan, Canada, China, Australia and other jurisdictions. Any patents that grant from applications claiming priority to this patent family would be expected to expire in 2041, absent any applicable patent term extensions.

The patent portfolio related to trem-cel also includes three patent families that we own. As of March 21, 2023, the first family, directed to compositions and methods of engineering lineage-specific antigens in HSCs includes one pending patent application in the United States and 14 pending foreign applications in Europe, Japan, Canada, China, Australia and other jurisdictions. Any patents that grant from applications claiming priority to this patent family would be expected to expire in 2038, absent any applicable patent term extensions. As of March 21, 2023, the second family, directed to compositions and methods of engineering multiple lineage-specific antigens in HSCs, includes six U.S. patents, three pending U.S. patent applications and at least 15 pending foreign patent applications. Any patents that grant from applications within these families would be expected to expire in 2039, absent any applicable patent term extensions. As of March 21, 2023, the third family, directed to compositions and methods of treating a hematopoietic malignancy, includes a pending Patent Cooperation Treaty (“PCT”) patent application. Any patents that grant from applications within this family would be expected to expire in 2041, absent any applicable patent term extensions.

We also own three patent families directed to compositions and methods of engineering specific antigens in HSCs, including CD33, CLL-1 and CD123. As of March 21, 2023, the first family, directed to compositions and methods for engineering CD33 in HSCs includes one pending U.S. application and eight pending foreign patent applications. As of March 21, 2023, the second family, directed to compositions and methods for engineering CLL-1

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in HSCs includes one pending U.S. application and eleven pending foreign patent applications. As of March 21, 2023, the third family, directed to compositions and methods for engineering CD123 in HSCs includes one pending U.S. application and 11 pending foreign applications.

We also own eight patent families directed to compositions and methods of engineering additional target antigens in HSCs. These families include five pending PCT applications, three pending U.S. applications and five pending foreign patent applications. Any patents that grant from applications within these families would be expected to expire in 2041 or 2042, absent any applicable patent term extensions.

Patent Rights Relating to Our Targeted Therapy Programs

We own three patent families directed to compositions and methods of making and using CARs. As of March 21, 2023, two of these families each include one pending PCT application and one family includes one pending U.S. application and two pending foreign patent applications, and any patents that grant from applications in these families would be expected to expire in 2041, absent any applicable patent term extensions.

We have one patent family that is exclusively licensed from the NIH related to our VCAR33 program. As of March 21, 2023, the patent family licensed from NCI is directed to CARs targeting CD33, compositions containing cells expressing CARs, and methods of use thereof, and includes one pending U.S. application and at least 14 pending foreign applications in Europe, Japan, Canada, China, Australia and other countries. Any patents that grant from applications in this patent family would be expected to expire in 2039, absent any applicable patent term extensions.

We own one patent family directed to compositions and methods of using single domain antibodies targeting CD33. As of March 21 2023, this family includes one pending U.S. patent application and six pending foreign patent applications, any patents that grant from applications in this family would be expected to expire in 2041, absent any applicable patent term extensions.

Provisional Patent Applications

As indicated above, some of our owned patent applications are provisional patent applications. Provisional patent applications are not eligible to become issued patents until, among other things, we file a non-provisional patent application within 12 months of filing of one or more of our related provisional patent applications. If we do not timely file any non-provisional patent applications, we may lose our priority date with respect to our provisional patent applications and any patent protection on the inventions disclosed in our provisional patent applications. While we intend to timely file non-provisional patent applications relating to our provisional patent applications, we cannot predict whether any such patent applications will result in the issuance of patents that provide us with any competitive advantage. Moreover, the patent application and approval process is expensive and time-consuming. We may not be able to file and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner.

Patent Term and Term Extensions

The term of individual patents depends upon the legal term for patents in the countries in which they are obtained. In most countries in which we have filed, including the United States, the patent term is 20 years from the earliest filing date of a non-provisional patent application. In the United States, a patent’s term may be lengthened by patent term adjustment, which compensates a patentee for administrative delays by the U.S. Patent and Trademark Office in examining and granting a patent, or may be shortened if a patent is terminally disclaimed over an earlier filed patent. The term of a patent that covers a drug or biological product may also be eligible for patent term extension when FDA approval is granted for a portion of the term effectively lost as a result of the FDA regulatory review period, subject to certain limitations and provided statutory and regulatory requirements are met. Any such patent term extension can be for no more than five years, only one patent per approved product can be extended, the extension cannot extend the total patent term beyond 14 years from FDA approval, and only those claims covering the approved drug, a method for using it, or a method for manufacturing it may be extended. We may not receive an extension if we fail to exercise due diligence during the testing phase or regulatory review process, fail to apply within applicable deadlines, fail to apply prior to expiration of relevant patents or otherwise fail to satisfy applicable requirements. Moreover, the length of the extension could be less than we request. In the future, if and when our product candidates receive approval from the FDA or foreign regulatory authorities, we

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expect to apply for patent term extensions on issued patents we may obtain in the future covering those products, depending upon the length of the clinical trials for each product and other factors. There can be no assurance that any of our pending patent applications will issue or that we will benefit from any patent term extension or favorable adjustment to the term of any of our patents.

As with other biotechnology and pharmaceutical companies, our ability to maintain and solidify our proprietary and intellectual property position for our product candidates will depend on our success in obtaining effective patent claims and enforcing those claims if granted. However, our owned and licensed pending patent applications, and any patent applications that we may in the future file or license from third parties may not result in the issuance of patents. We also cannot predict the breadth of claims that may be allowed or enforced in our patents. Any issued patents that we may receive in the future may be challenged, invalidated, infringed or circumvented. In addition, because of the extensive time required for clinical development and regulatory review of a product candidate we may develop, it is possible that, before any of our product candidates can be commercialized, any related patent may expire or remain in force for only a short period following commercialization, thereby limiting the protection such patent would afford the respective product and any competitive advantage such patent may provide. For more information, see the section entitled “Risk Factors—Risks Related to Intellectual Property.”

Other IP Rights

In addition to patents, we rely upon unpatented trade secrets and know-how, continuing technological innovation and confidential information to develop and maintain our proprietary position and protect aspects of our business that are not amenable to, or that we do not consider appropriate for, patent protection, including our proprietary processes for generating and propagating eHSCs. However, trade secrets and know-how can be difficult to protect. We seek to protect our proprietary information, in part, by executing confidentiality agreements with our collaborators and scientific advisors, and non-competition, non-solicitation, confidentiality and invention assignment agreements with our employees and consultants. We have also executed agreements requiring assignment of inventions with selected scientific advisors and collaborators. The confidentiality agreements we enter into are designed to protect our proprietary information and the agreements or clauses requiring assignment of inventions to us are designed to grant us ownership of technologies that are developed through our relationship with the respective counterparty. We cannot guarantee, however, that we have executed such agreements with all applicable counterparties, such agreements will not be breached, or that these agreements will afford us adequate protection of our intellectual property and proprietary rights. In addition, our trade secrets may otherwise become known or be independently discovered by competitors. To the extent that our commercial partners, collaborators, employees and consultants use intellectual property owned by others in their work for us, disputes may arise as to the rights in related or resulting know-how and inventions. For more information, see the section entitled “Risk Factors—Risks Related to Our Intellectual Property” in Part I, Item 1A of this Annual Report.

Our commercial success will also depend in part on not infringing upon the proprietary rights of third parties. It is uncertain whether the issuance of any third-party patent would require us to alter our development or commercial strategies, or our drugs or processes, obtain licenses or cease certain activities. Our breach of any license agreements or failure to obtain a license to proprietary rights that we may require to develop or commercialize our future drugs may have an adverse impact on us. Since patent applications in the United States and certain other jurisdictions are maintained in secrecy for 18 months or potentially longer, and since publication of discoveries in the scientific or patent literature often lags behind actual discoveries, we cannot be certain of the priority of inventions covered by pending patent applications.

Trademarks

We also aim to obtain and maintain registration for trademarks that we consider are relevant to our business. As of March 21, 2023, we have filed for registration of the trademarks for VOR BIOPHARMA, for VOR33, for VOR, for our "V" logo, and for VOR BIO, for international class 5 (pharmaceuticals) under the Madrid Protocol, with more than 50 applications in the United States and foreign jurisdictions. We plan to register additional trademarks in connection with any future pharmaceutical products we may commercialize, if approved.

Government Regulation and Product Approval

As a biopharmaceutical company that operates in the United States, we are subject to extensive regulation. Our cell product candidates will be regulated as biologics. With this classification, commercial production of our product candidates will need to occur in registered facilities in compliance with current good manufacturing

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practices (“cGMP”) for biologics. The FDA categorizes human cell- or tissue-based products as either minimally manipulated or more than minimally manipulated and has determined that more than minimally manipulated products require clinical trials to demonstrate product safety and efficacy and the submission of a Biologics License Application (“BLA”) for marketing authorization. Our product candidates are considered more than minimally manipulated and will require evaluation in clinical trials and the submission and approval of a BLA before we can market them.

The FDA and other government authorities in the United States (at the federal, state and local levels) and in other countries extensively regulate, among other things, the research, development, testing, manufacturing, quality control, approval, labeling, packaging, storage, record-keeping, promotion, advertising, distribution, post-approval monitoring and reporting, marketing and export and import of biopharmaceutical products such as those we are developing. Our product candidates must be approved by the FDA before they may be legally marketed in the United States and by the appropriate foreign regulatory agency before they may be legally marketed in foreign countries. Generally, our activities in other countries will be subject to regulation that is similar in nature and scope as that imposed in the United States, although there can be important differences. Additionally, some significant aspects of regulation in Europe are addressed in a centralized way, but country-specific regulation remains essential in many respects. The process for obtaining regulatory marketing approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of substantial time and financial resources.

U.S. Product Development Process

In the United States, the FDA regulates pharmaceutical and biological products under the Federal Food, Drug and Cosmetic Act, the Public Health Service Act (“PHSA”) and their implementing regulations. The process of obtaining regulatory approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of substantial time and financial resources. Failure to comply with the applicable U.S. requirements at any time during the product development process, approval process or after approval, may subject an applicant to administrative or judicial sanctions. FDA sanctions could include, among other actions, refusal to approve pending applications, withdrawal of an approval, a clinical hold, warning letters, product recalls or withdrawals from the market, product seizures, total or partial suspension of production or distribution injunctions, fines, refusals of government contracts, restitution, disgorgement or civil or criminal penalties. Any agency or judicial enforcement action could have a material adverse effect on us. The process required by the FDA before a biological product may be marketed in the United States generally involves the following:

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Before testing any biological product candidate, including our product candidates, in humans, the product candidate enters the preclinical testing stage. Preclinical tests, also referred to as nonclinical studies, include laboratory evaluations of product chemistry, toxicity and formulation, as well as animal studies to assess the potential safety, biodistribution and activity of the product candidate. The conduct of the preclinical tests must comply with federal regulations and requirements including GLPs. The clinical trial sponsor must submit the results of the preclinical tests, together with manufacturing information, analytical data, any available clinical data or literature and a proposed clinical protocol, to the FDA as part of the IND. Some preclinical testing may continue even after the IND is submitted. The IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA raises concerns or questions regarding the proposed clinical trials and places the trial on a clinical hold within that 30-day time period. In such a case, the IND sponsor must resolve any outstanding concerns of the FDA before the clinical trial can begin. The FDA may also impose clinical holds on a biological product candidate at any time before or during clinical trials due to safety concerns or non-compliance. If the FDA imposes a clinical hold, trials may not recommence without FDA authorization and then only under terms authorized by the FDA. Accordingly, we cannot be sure that submission of an IND will result in the FDA allowing clinical trials to begin, or that, once begun, issues will not arise that suspend or terminate such trials.

Supervision of human gene transfer trials includes evaluation and assessment by an Institutional Biosafety Committee (“IBC”), a local institutional committee that reviews and oversees research utilizing recombinant or synthetic nucleic acid molecules at that institution, as set forth in the NIH Guidelines for Research Involving Recombinant or Synthetic Nucleic Acid Molecules (“NIH Guidelines”). The IBC assesses the safety of the research and identifies any potential risk to public health or the environment, and such review may result in some delay before initiation of a clinical trial. While the NIH Guidelines are not mandatory unless the research in question is being conducted at or sponsored by institutions receiving NIH funding of recombinant or synthetic nucleic acid molecule research, many companies and other institutions not otherwise subject to the NIH Guidelines voluntarily follow them.

Clinical trials involve the administration of the biological product candidate to human subjects under the supervision of qualified investigators, generally physicians not employed by or under the trial sponsor’s control. Clinical trials are conducted under protocols detailing, among other things, the objectives of the clinical trial, dosing procedures, subject selection and exclusion criteria, and the parameters to be used to monitor subject safety, including stopping rules that assure a clinical trial will be stopped if certain adverse events should occur. Each protocol and any amendments to the protocol must be submitted to the FDA as part of the IND. Clinical trials must be conducted and monitored in accordance with the FDA’s regulations comprising the GCP requirements, including the requirement that all research patients provide informed consent. Further, each clinical trial must be reviewed and approved by an independent IRB at or servicing each institution at which the clinical trial will be conducted. An IRB is charged with protecting the welfare and rights of trial participants and considers such items as whether the risks to individuals participating in the clinical trials are minimized and are reasonable in relation to anticipated benefits. The IRB also approves the form and content of the informed consent that must be signed by each clinical trial subject or his or her legal representative and must monitor the clinical trial until completed. Certain clinical trials involving human gene transfer research also must be overseen by an IBC, a standing committee established specifically to provide peer review of the safety of research plans, procedures, personnel training and environmental risks of work involving recombinant DNA molecules. IBCs are typically assigned certain review responsibilities relating to the use of recombinant DNA molecules, including reviewing potential environmental risks, assessing containment levels, and evaluating the adequacy of facilities, personnel training and compliance with the NIH Guidelines. Some studies also include oversight by an independent group of qualified experts organized by the clinical study sponsor, known as a data safety monitoring board, which provides authorization for whether or not a study may move forward at designated check points based on access to certain data from the study and may halt the clinical trial if it determines that there is an unacceptable safety risk for subjects or other grounds, such as no

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demonstration of efficacy. There are also requirements governing the reporting of ongoing clinical studies and clinical study results to public registries.

For purposes of BLA approval, human clinical trials are typically conducted in three sequential phases that may overlap or be combined:

Post-approval clinical trials, sometimes referred to as Phase 4 clinical trials, may be conducted after initial marketing approval. These clinical trials are used to gain additional experience from the treatment of patients in the intended therapeutic indication, particularly for long-term safety follow-up. These Phase 4 studies may be made a condition to approval of the BLA. During all phases of clinical development, regulatory agencies require extensive monitoring and auditing of all clinical activities, clinical data and clinical trial investigators. Annual progress reports detailing the results of the clinical trials must be submitted to the FDA. Written IND safety reports must be promptly submitted to the FDA, and the investigators for serious and unexpected adverse events, any findings from other studies, tests in laboratory animals or in vitro testing that suggest a significant risk for human patients, or any clinically important increase in the rate of a serious suspected adverse reaction over that listed in the protocol or investigator brochure. The sponsor must submit an IND safety report within 15 calendar days after the sponsor determines that the information qualifies for reporting. The sponsor also must notify the FDA of any unexpected fatal or life-threatening suspected adverse reaction within seven calendar days after the sponsor’s initial receipt of the information. Phase 1, Phase 2 and Phase 3 clinical trials may not be completed successfully within any specified period, if at all. The FDA or the sponsor or its data safety monitoring board may suspend or terminate a clinical trial at any time on various grounds, including a finding that the research patients are being exposed to an unacceptable health risk, including risks inferred from other related or unrelated gene and cell therapy trials. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the biological product has been associated with unexpected serious harm to patients. In addition, some clinical trials are overseen by an independent group of qualified experts organized by the sponsor, known as a data safety monitoring board or committee. Depending on its charter, this group may determine whether a trial may move forward at designated check points based on access to certain data from the trial.

Gene therapy products are a new category of therapeutics. Because this is a relatively new and expanding area of novel therapeutic interventions, there can be no assurance as to the length of the trial period, the number of patients the FDA will require to be enrolled in the trials in order to establish the safety, efficacy, purity and potency of gene therapy products, or that the data generated in these trials will be acceptable to the FDA to support marketing approval.

Concurrently with clinical trials, companies usually complete additional studies and must also develop additional information about the physical characteristics of the biological product candidate as well as finalize a process for manufacturing the product candidate in commercial quantities in accordance with cGMP requirements. To help reduce the risk of the introduction of adventitious agents with use of biological products, the PHSA emphasizes the importance of manufacturing control for products whose attributes cannot be precisely defined. The manufacturing process must be capable of consistently producing quality batches of the product candidate and,

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among other things, the sponsor must develop methods that are fully validated for testing the identity, strength, quality, potency and purity of the final biological product candidate. Additionally, appropriate packaging must be selected and tested and stability studies must be conducted to demonstrate that the biological product candidate does not undergo unacceptable deterioration over its shelf life. Ensuring that the manufacturing process is robust and suitable to pass an FDA pre-approval inspection for a BLA is resource-intensive and requires sufficient time to prepare. Process improvement steps taken before, during and after a pivotal trial may also require a comparability protocol that would need to be conducted and reviewed by FDA.

U.S. Review and Approval Processes

After the completion of clinical trials of a biological product candidate, FDA approval of a BLA must be obtained before commercial marketing of the biological product. The BLA submission must include all relevant data of product development, laboratory and animal studies, human trials, information on the manufacture and composition of the product, proposed labeling and other relevant information. The testing and approval processes require substantial time and effort and there can be no assurance that the FDA will accept the BLA for filing and, even if filed, that any approval will be granted on a timely basis, if at all.

Under the Prescription Drug User Fee Act, as amended (“PDUFA”), each BLA must be accompanied by a significant user fee. The FDA adjusts the PDUFA user fees on an annual basis. PDUFA also imposes an annual program fee for biological products. Fee waivers or reductions are available in certain circumstances, including a waiver of the application fee for the first application filed by a small business. Additionally, no user fees are assessed on BLAs for products designated as orphan drugs, unless the product also includes a non-orphan indication.

Within 60 days following submission of the application, the FDA reviews a BLA submitted to determine if it is substantially complete before the agency accepts it for filing. The FDA may refuse to file any BLA that it deems incomplete or not properly reviewable at the time of submission and may request additional information. In this event, the BLA must be resubmitted with the additional information. The resubmitted application also is subject to review before the FDA accepts it for filing. Once the submission is accepted for filing, the FDA begins an in-depth substantive review of the BLA. The FDA reviews the BLA to determine, among other things, whether the proposed product is safe, potent and/or effective for its intended use and has an acceptable purity profile, and whether the product candidate is being manufactured in accordance with cGMP to assure and preserve the product candidate’s identity, safety, strength, quality, potency and purity. The FDA may refer applications for novel biological product candidates or biological product candidates that present difficult questions of safety or efficacy to an advisory committee, typically a panel that includes clinicians and other experts, for review, evaluation and a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making decisions. During the biological product candidate approval process, the FDA also will determine whether a Risk Evaluation and Mitigation Strategy (“REMS”) is necessary to assure the safe use of the biological product candidate. A REMS is a safety strategy to manage a known or potential serious risk associated with a medicine and to enable patients to have continued access to such medicines by managing their safe use, and could include medication guides, physician communication plans or elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. If the FDA concludes a REMS is needed, the sponsor of the BLA must submit a proposed REMS. The FDA will not approve a BLA without a REMS, if required.

Before approving a BLA, the FDA will inspect the facilities at which the product candidate is manufactured. The FDA will not approve the product candidate unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure consistent production of the product candidate within required specifications. For immunotherapy product candidates, the FDA also will not approve the product candidate if the manufacturer is not in compliance with GTPs, to the extent applicable. These are FDA regulations and guidance documents that govern the methods used in, and the facilities and controls used for, the manufacture of human cells, tissue and cellular and tissue based products (“HCT/Ps”), which are human cells or tissue intended for implantation, transplant, infusion or transfer into a human recipient. The primary intent of the GTP requirements is to ensure that cell and tissue based products are manufactured in a manner designed to prevent the introduction, transmission and spread of communicable disease. FDA regulations also require tissue establishments to register and list their HCT/Ps with the FDA and, when applicable, to evaluate donors through screening and testing. Additionally, before approving a BLA, the FDA will typically inspect one or more clinical sites to assure that the clinical trials were conducted in compliance with IND trial requirements and GCP requirements. To assure cGMP,

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GTP and GCP compliance, an applicant must incur significant expenditure of time, money and effort in the areas of training, record keeping, production and quality control.

Notwithstanding the submission of relevant data and information, the FDA may ultimately decide that the BLA does not satisfy its regulatory criteria for approval and deny approval. Data obtained from clinical trials are not always conclusive and the FDA may interpret data differently than we interpret the same data. If the agency decides not to approve the BLA in its present form, the FDA will issue a complete response letter that describes all of the specific deficiencies in the BLA identified by the FDA. The deficiencies identified may be minor, for example, requiring labeling changes, or major, for example, requiring additional clinical trials. Additionally, the complete response letter may include recommended actions that the applicant might take to place the application in a condition for approval. If a complete response letter is issued, the applicant may either resubmit the BLA, addressing all of the deficiencies identified in the letter, or withdraw the application.

If a product receives regulatory approval, the approval may be limited to specific diseases and dosages or the indications for use may otherwise be limited, which could restrict the commercial value of the product. Further, the FDA may require that certain contraindications, warnings or precautions be included in the product labeling. The FDA also may require a ‘Black Box Warning’ for noting serious adverse effects or other critical warnings regarding the use of the product. The FDA may impose restrictions and conditions on product distribution, prescribing or dispensing in the form of a risk management plan, a more formal REMS requirement or otherwise limit the scope of any approval. In addition, the FDA may require post marketing clinical trials, sometimes referred to as Phase 4 clinical trials, designed to further assess a biological product’s safety and effectiveness, and testing and surveillance programs to monitor the safety of approved products that have been commercialized.

In addition, under the Pediatric Research Equity Act (“PREA”), a BLA or supplement to a BLA must contain data to assess the safety and effectiveness of the product for the claimed indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. The FDA may grant deferrals for submission of data or full or partial waivers. Unless otherwise required by regulation, PREA does not apply to any product for an indication for which orphan designation has been granted. However, if only one indication for a product has orphan designation, a pediatric assessment may still be required for any applications to market that same product for the non-orphan indication(s).

Orphan Drug Designation

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biologic intended to treat a rare disease or condition, which is generally a disease or condition that affects fewer than 200,000 individuals in the United States, or more than 200,000 individuals in the United States and for which there is no reasonable expectation that the cost of developing and making available in the United States a drug or biologic for this type of disease or condition will be recovered from sales in the United States for that drug or biologic. Orphan drug designation must be requested before submitting a BLA. After the FDA grants orphan drug designation, the generic identity of the therapeutic agent and its potential orphan use are disclosed publicly by the FDA. The orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review or approval process.

If a product candidate that has orphan drug designation subsequently receives the first FDA approval for the disease for which it has such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications, including a full BLA, to market the same biologic for the same indication for seven years, except in limited circumstances, such as a showing of clinical superiority to the product with orphan drug exclusivity. Orphan drug exclusivity does not prevent FDA from approving a different drug or biologic for the same disease or condition, or the same drug or biologic for a different disease or condition. Among the other benefits of orphan drug designation are tax credits for certain research and a waiver of the BLA application user fee.

A designated orphan drug may not receive orphan drug exclusivity if it is approved for a use that is broader than the indication for which it received orphan designation. In addition, exclusive marketing rights in the United States may be lost if the FDA later determines that the request for designation was materially defective, if the second applicant demonstrates that its product is clinically superior to the approved product with orphan exclusivity, or if the manufacturer is unable to assure sufficient quantities of the product to meet the needs of patients with the rare disease or condition. Orphan drug designation may also entitle a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax advantages and user-fee waivers.

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Expedited Development and Review Programs

The FDA has established certain programs intended to expedite or facilitate the process for developing, reviewing or approving new products that meet certain criteria, including fast track designation, breakthrough therapy designation, accelerated approval and priority review. Specifically, new product candidates are eligible for fast track designation if they are intended to treat a serious or life-threatening disease or condition and demonstrate the potential to address unmet medical needs for the disease or condition. Fast track designation applies to the combination of the product candidate and the specific indication for which it is being studied. Unique to a fast track product, the FDA may consider for review sections of the BLA on a rolling basis before the complete application is submitted, if the sponsor provides a schedule for the submission of the sections of the BLA and the payment of applicable user fees, the FDA agrees to accept sections of the BLA and determines that the schedule is acceptable, and the sponsor pays any required user fees upon submission of the first section of the BLA.

Any product candidate submitted to the FDA for approval, including a product candidate with a fast track designation, may also be eligible for other types of FDA programs intended to expedite development and review, such as priority review and accelerated approval. A product candidate is eligible for priority review if it has the potential to provide safe and effective therapy where no satisfactory alternative therapy exists or a significant improvement in the treatment, diagnosis or prevention of a disease compared to marketed products. The FDA will attempt to direct additional resources to the evaluation of an application for a new product candidate designated for priority review in an effort to facilitate the review.

Additionally, a product candidate may be eligible for accelerated approval. Product candidates studied for their safety and effectiveness in treating serious or life-threatening diseases or conditions may receive accelerated approval upon a determination that the product candidate has an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity or prevalence of the condition and the availability or lack of alternative treatments. As a condition of approval, the FDA may require that a sponsor of a drug or biological product candidate receiving accelerated approval perform adequate and well-controlled post-marketing clinical studies. The FDA may withdraw approval of a drug or indication approved under accelerated approval if, for example, the confirmatory trial fails to verify the predicted clinical benefit of the product. In addition, the FDA currently requires as a condition for accelerated approval pre-approval of promotional materials, which could adversely impact the timing of the commercial launch of the product candidate. Also, there is the possibility that reimbursement by certain federal programs in the future may be reduced for products that receive accelerated approval.

Breakthrough therapy designation is intended to expedite the development and review of product candidates that treat serious or life-threatening conditions. The designation by FDA requires preliminary clinical evidence that a product candidate, alone or in combination with other drugs and biologics, demonstrates substantial improvement over currently available therapy on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. If the FDA designates a breakthrough therapy, it may take actions appropriate to expedite the development and review of the application, which may include holding meetings with the sponsor and the review team throughout the development of the therapy; providing timely advice to, and interactive communication with, the sponsor regarding the development of the drug to ensure that the development program to gather the nonclinical and clinical data necessary for approval is as efficient as practicable; involving senior managers and experienced review staff, as appropriate, in a collaborative, cross-disciplinary review; assigning a cross-disciplinary project lead for the FDA review team to facilitate an efficient review of the development program and to serve as a scientific liaison between the review team and the sponsor; and considering alternative clinical trial designs when scientifically appropriate, which may result in smaller trials or more efficient trials that require less time to complete and may minimize the number of patients exposed to a potentially less efficacious treatment. Breakthrough therapy designation comes with all of the benefits of fast-track designation, which means that the sponsor may file sections of the BLA for review on a rolling basis if certain conditions are satisfied, including an agreement with FDA on the proposed schedule for submission of portions of the application and the payment of applicable user fees before the FDA may initiate a review. The breakthrough therapy designation is a distinct status from both accelerated approval and priority review, which can also be granted to the same product candidate if relevant criteria are met. If a product candidate is designated as breakthrough therapy, FDA will expedite the development and review of such product candidate.

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Specifically for cell and gene therapy products, a Regenerative Medicine Advanced Therapy ("RMAT") designation may be granted by FDA. It is a process designed to facilitate the development and expedite the review of such products to treat serious conditions and fill an unmet medical need. The criteria for the RMAT designation includes the following: a product that is intended to treat a serious condition, addresses an unmet medical need, and has clinical data demonstrating the product has the potential to address this unmet medical need.

Fast Track designation, priority review, accelerated approval, RMAT and breakthrough therapy designations do not change the standards for approval but may expedite the development or approval process. Even if a product qualifies for one or more of these programs, the FDA may later decide that the product no longer meets the conditions for qualification or that the time period for FDA review and approval will not be shortened.

Post-Approval Requirements

Any products for which we receive FDA approvals are subject to continuing regulation by the FDA, including, among other things, continuing user fee requirements, record-keeping requirements, reporting of adverse experiences with the product, providing the FDA with updated safety and efficacy information, product sampling and distribution requirements, and complying with FDA promotion and advertising requirements, which include, among others, standards for direct-to-consumer advertising, restrictions on promoting products for uses or in patient populations that are not described in the product’s approved uses (known as “off-label use”), limitations on industry-sponsored scientific and educational activities, and requirements for promotional activities involving the internet. Although a physician may prescribe a legally available product for an off-label use, if the physician deems such product to be appropriate in his/her professional medical judgment, a manufacturer may not market or promote off-label uses. However, companies may share truthful and not misleading information that is otherwise consistent with a product’s FDA-approved labeling. A company that is found to have promoted off-label use of its product may be subject to significant liability, including administrative, civil and criminal sanctions.

In addition, quality control and manufacturing procedures must continue to conform to applicable manufacturing requirements after approval to ensure the long-term stability of the product. cGMP regulations require among other things, quality control and quality assurance as well as the corresponding maintenance of records and documentation and the obligation to investigate and correct any deviations from cGMP. Manufacturers and other entities involved in the manufacture and distribution of approved products are required to register their establishments with the FDA and certain state agencies and are subject to periodic unannounced inspections by the FDA and certain state agencies for compliance with cGMP and other laws. Accordingly, manufacturers must continue to expend time, money and effort in the area of production and quality control to maintain cGMP compliance. Discovery of problems with a product after approval may result in restrictions on a product, manufacturer or holder of an approved BLA, including, among other things, recall or withdrawal of the product from the market. In addition, changes to the manufacturing process are strictly regulated and, depending on the significance of the change, may require prior FDA approval before being implemented. Other types of changes to the approved product, such as adding new indications and claims, are also subject to further FDA review and approval.

The FDA also may require post-marketing testing, known as Phase 4 testing, and surveillance to monitor the effects of an approved product. Discovery of previously unknown problems with a product or the failure to comply with applicable FDA requirements can have negative consequences, including adverse publicity, judicial or administrative enforcement, warning letters from the FDA, mandated corrective advertising or communications with doctors, and civil or criminal penalties, among others. Newly discovered or developed safety or effectiveness data may require changes to a product’s approved labeling, including the addition of new warnings and contraindications, and also may require the implementation of other risk management measures. Also, new government requirements, including those resulting from new legislation, may be established, or the FDA’s policies may change, which could delay or prevent regulatory approval of our products under development.

The FDA may withdraw approval if compliance with regulatory requirements and standards is not maintained or if problems occur after the product reaches the market. Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or with manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new safety information; imposition of post-market studies or clinical studies to assess new safety risks; or

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imposition of distribution restrictions or other restrictions under a REMS program. Other potential consequences include, among other things:

U.S. Marketing Exclusivity

The Biologics Price Competition and Innovation Act (“BPCIA”) amended the PHSA to authorize the FDA to approve similar versions of innovative biologics, commonly known as biosimilars. A competitor seeking approval of a biosimilar must file an application to establish its molecule as highly similar to an approved innovator biologic, among other requirements.

Biosimilarity, which requires that there be no clinically meaningful differences between the biological product and the reference product in terms of safety, purity, and potency, can be shown through analytical studies, animal studies, and a clinical study or studies. Interchangeability requires that a product is biosimilar to the reference product and the product must demonstrate that it can be expected to produce the same clinical results as the reference product in any given patient and, for products that are administered multiple times to an individual, the biologic and the reference biologic may be alternated or switched after one has been previously administered without increasing safety risks or risks of diminished efficacy relative to exclusive use of the reference biologic. Complexities associated with the larger, and often more complex, structures of biological products, as well as the processes by which such products are manufactured, pose significant hurdles to implementation of the abbreviated approval pathway that are still being worked out by the FDA.

Under the BPCIA, an application for a biosimilar product may not be submitted to the FDA until four years following the date that the reference product was first licensed by the FDA. In addition, the approval of a biosimilar product may not be made effective by the FDA until 12 years from the date on which the reference product was first licensed. During this 12-year period of exclusivity, another company may still market a competing version of the reference product if the FDA approves a full BLA for the competing product containing that applicant’s own preclinical data and data from adequate and well controlled clinical trials to demonstrate the safety, purity and potency of its product. The BPCIA also created certain exclusivity periods for biosimilars approved as interchangeable products. At this juncture, it is unclear whether products deemed “interchangeable” by the FDA will, in fact, be readily substituted by pharmacies, which are governed by state pharmacy law.

The BPCIA is complex and continues to be interpreted and implemented by the FDA. In addition, recent government proposals have sought to reduce the 12-year reference product exclusivity period. Other aspects of the BPCIA, some of which may impact the BPCIA exclusivity provisions, have also been the subject of recent litigation. As a result, the ultimate impact, implementation, and impact of the BPCIA is subject to significant uncertainty.

Pediatric exclusivity is another type of regulatory market exclusivity in the United States. Pediatric exclusivity, if granted, adds six months to existing exclusivity periods and patent terms. This six-month exclusivity, which runs from the end of other exclusivity protection or patent term, may be granted based on the voluntary completion of a pediatric trial in accordance with an FDA-issued “Written Request” for such a trial.

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Other U.S. Healthcare Laws and Compliance Requirements

In the United States, our activities are potentially subject to regulation by various federal, state and local authorities in addition to the FDA, including but not limited to, the CMS, other divisions of the U.S. Department of Health and Human Services (e.g., the Office of Inspector General), the U.S. Department of Justice (“DOJ”) and individual U.S. Attorney offices within the DOJ, and state and local governments. For example, our business practices, including our clinical research and any future sales, marketing and scientific/educational grant programs may be required to comply with the fraud and abuse provisions of the Social Security Act, the false claims laws, the data privacy and security provisions of the Health Insurance Portability and Accountability Act (“HIPAA”), federal transparency requirements and similar state laws, each as amended.

The federal Anti-Kickback Statute prohibits, among other things, any person or entity, from knowingly and willfully offering, paying, soliciting or receiving any remuneration (including any kickback, bribe or rebate), directly or indirectly, overtly or covertly, in cash or in kind, to induce or in return for, either the referral of an individual for, or the purchasing, leasing, ordering or arranging for the purchase, lease or order of any item or service reimbursable under Medicare, Medicaid or other federal healthcare programs. The term remuneration has been interpreted broadly to include anything of value. The federal Anti-Kickback Statute has been interpreted to apply to arrangements between pharmaceutical manufacturers on one hand and prescribers, purchasers and formulary managers on the other. There are a number of statutory exceptions and regulatory safe harbors protecting some common activities from prosecution. The exceptions and safe harbors are drawn narrowly and require strict compliance in order to offer protection. Practices that involve remuneration that may be alleged to be intended to induce prescribing, purchasing or recommending may be subject to scrutiny if they do not qualify for an exception or safe harbor. Failure to meet all of the requirements of a particular applicable statutory exception or regulatory safe harbor does not make the conduct per se illegal under the Anti-Kickback Statute. Instead, the legality of the arrangement will be evaluated on a case-by-case basis based on a cumulative review of all of its facts and circumstances. In addition, a person or entity does not need to have actual knowledge of the federal Anti-Kickback Statute or specific intent to violate it in order to have committed a violation. Rather, if “one purpose” of the remuneration is to induce referrals, the federal Anti-Kickback Statute is violated.

The federal civil monetary penalties statute imposes penalties against any person or entity who, among other things, is determined to have knowingly presented or caused to be presented a false or fraudulent claim to, among others, a federal healthcare program that the person knows or should know is for an item or service that was not provided as claimed or is false or fraudulent.

The federal civil False Claims Act prohibits, among other things, any person or entity from knowingly presenting, or causing to be presented, a false claim for payment to, or approval by, the federal government or knowingly making, using or causing to be made or used a false record or statement material to a false or fraudulent claim to the federal government in order to avoid, decrease or conceal an obligation to pay money to the federal government. As a result of a modification made by the Fraud Enforcement and Recovery Act of 2009, a claim includes “any request or demand” for money or property presented to the federal government. The federal civil False Claims Act can be enforced through private “qui tam” actions brought by individual whistleblowers in the name of the government. In addition, manufacturers can be held liable under the civil False Claims Act even when they do not submit claims directly to government payors if they are deemed to “cause” the submission of false or fraudulent claims. Pharmaceutical and other healthcare companies are being investigated or, in the past, have been prosecuted under these laws for, among other things, allegedly providing free product to customers with the expectation that the customers would bill federal programs for the product. In addition, pharmaceutical and other healthcare companies also have been prosecuted for causing false claims to be submitted because of the companies’ marketing of the product for unapproved, and thus non-reimbursable, uses and purportedly concealing price concessions in the pricing information submitted to the government for government priced reporting purposes. A claim that includes items or services resulting from a violation of the federal Anti-Kickback Statute also constitutes a false or fraudulent claim for purposes of the federal civil False Claims Act.

HIPAA created additional federal criminal statutes that prohibit knowingly and willfully executing, or attempting to execute, a scheme or artifice to defraud or to obtain, by means of false or fraudulent pretenses, representations or promises, any money or property owned by, or under the control or custody of, any healthcare benefit program, including private third-party payors and knowingly and willfully falsifying, concealing or covering up by trick, scheme or device, a material fact or making any materially false, fictitious or fraudulent statement in connection with the delivery of or payment for healthcare benefits, items or services. Similar to the federal

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Anti-Kickback Statute, a person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation.

We may be subject to data privacy and security regulations by both the federal government and the states in which we conduct our business. HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009 and its implementing regulations (which we collectively refer to as HIPAA), imposes requirements on certain types of individuals and entities, including covered entities (i.e., certain healthcare providers, health plans and healthcare clearinghouses), as well as their business associates that perform certain services on behalf of the covered entities and their covered subcontractors, relating to the privacy, security and transmission of individually identifiable health information. Entities that are found to be in violation of HIPAA as the result of a breach of unsecured protected health information, a complaint about privacy practices or an audit by the U.S. Department of Health and Human Services (“HHS”), may be subject to significant civil, criminal and administrative fines and penalties and/or additional reporting and oversight obligations if required to enter into a resolution agreement and corrective action plan with HHS to settle allegations of HIPAA non-compliance. Further, entities that knowingly obtain, use, or disclose individually identifiable health information maintained by a HIPAA covered entity in a manner that is not authorized or permitted by HIPAA may be subject to criminal penalties. In addition, state laws govern the privacy and security of health information in specified circumstances, many of which differ from each other in significant ways and may not have the same effect, thus complicating compliance efforts.

Additionally, the federal Physician Payments Sunshine Act created under the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act, and its implementing regulations (collectively, the “ACA”), require that certain manufacturers of drugs, devices, biological and medical supplies for which payment is available under Medicare, Medicaid or the Children’s Health Insurance Program (with certain exceptions) annually report information to CMS related to certain payments or other transfers of value made or distributed to physicians (currently defined to include doctors, dentists, optometrists, podiatrists and chiropractors), other healthcare professionals (such as physician assistants and nurse practitioners), and teaching hospitals, or to entities or individuals at the request of, or designated on behalf of, the physicians and teaching hospitals and to report annually certain ownership and investment interests held by physicians and their immediate family members.

Also, many states have similar fraud and abuse statutes or regulations similar to the aforementioned federal laws that apply to items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payor. In order to distribute products commercially, we must comply with state laws that require the registration of manufacturers and wholesale distributors of drug and biological products in a state, including, in certain states, manufacturers and distributors who ship products into the state even if such manufacturers or distributors have no place of business within the state. Some states also impose requirements on manufacturers and distributors to establish the pedigree of product in the chain of distribution, including some states that require manufacturers and others to adopt new technology capable of tracking and tracing product as it moves through the distribution chain. Several states and local jurisdictions have enacted legislation requiring pharmaceutical and biotechnology companies to establish marketing compliance programs and comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government, file periodic reports with the state, make periodic public disclosures on sales, marketing, pricing, clinical trials and other activities, and/or register their sales representatives, as well as to prohibit pharmacies and other healthcare entities from providing certain physician prescribing data to pharmaceutical and biotechnology companies for use in sales and marketing, and to prohibit certain other sales and marketing practices. All of our activities are also potentially subject to federal and state consumer protection and unfair competition laws.

If our operations are found to be in violation of any of the federal and state healthcare laws described above or any other governmental regulations that apply to us, we may be subject to significant penalties, including without limitation, civil, criminal and/or administrative penalties, damages, fines, disgorgement, imprisonment, exclusion from participation in government programs, such as Medicare and Medicaid, injunctions, contractual damages, reputational harm, administrative burdens, diminished profits and future earnings, additional reporting requirements and/or oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of non-compliance with these laws, and the curtailment or restructuring of our operations, any of which could adversely affect our ability to operate our business and our results of operations.

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Coverage, Pricing and Reimbursement

Significant uncertainty exists as to the coverage and reimbursement status of any product candidates for which we obtain regulatory approval. In the United States and certain markets in other countries, sales of any products for which we receive regulatory approval for commercial sale will depend, in part, on the extent to which third-party payors provide coverage and establish adequate reimbursement levels for such products. No uniform policy for coverage and reimbursement exists in the United States, and coverage and reimbursement can differ significantly from payor to payor. As a result, the coverage determination process is often time-consuming and costly. In the United States, third-party payors include federal and state healthcare programs, private managed care providers, health insurers and other organizations. The process for determining whether a third-party payor will provide coverage for a product may be separate from the process for setting the price of a product or from establishing the reimbursement rate that such a payor will pay for the product. Third-party payors may limit coverage to specific products on an approved list, also known as a formulary, which might not include all of the FDA-approved products for a particular indication.

Third-party payors are increasingly challenging the price, examining the medical necessity and reviewing the cost-effectiveness of medical products, therapies and services, in addition to questioning their safety and efficacy. New metrics frequently are used as the basis for reimbursement rates, such as average sales price, average manufacturer price and actual acquisition cost. We may need to conduct expensive pharmaco-economic studies in order to demonstrate the medical necessity and cost-effectiveness of our products, in addition to the costs required to obtain the FDA approvals. Our product candidates may not be considered medically necessary or cost-effective. A payor’s decision to provide coverage for a product does not imply that an adequate reimbursement rate will be approved. Further, one payor’s determination to provide coverage for a product does not assure that other payors will also provide coverage for the product. Adequate third-party reimbursement may not be available to enable us to maintain price levels sufficient to realize an appropriate return on our investment in product development. We cannot predict at this time what third-party payors will decide with respect to the coverage and reimbursement for our product candidates including, for example, whether we will seek, and whether CMS would approve, an NTAP under the IPPS for our product candidates, once approved. NTAP will only be available for our products if we submit a timely and complete application and CMS determines that our product candidates meet the eligibility requirements of NTAP, including, among other criteria, demonstrating a substantial clinical improvement relative to services or technologies previously available.

Additionally, the containment of healthcare costs has become a priority of federal and state governments, and the prices of drugs have been a focus in this effort. The United States government, state legislatures and foreign governments have shown significant interest in implementing cost-containment programs, including price controls, restrictions on reimbursement and requirements for substitution of generic products. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could further limit our net revenue and results.

Different pricing and reimbursement schemes exist in other countries. In the EU, governments influence the price of pharmaceutical products through their pricing and reimbursement rules and control of national health care systems that fund a large part of the cost of those products to consumers. Some jurisdictions operate positive and negative list systems under which products may only be marketed once a reimbursement price has been agreed. To obtain reimbursement or pricing approval, some of these countries may require the completion of clinical trials that compare the cost-effectiveness of a particular product candidate to currently available therapies. Other member states allow companies to fix their own prices for medicines, but monitor and control company profits. The downward pressure on health care costs has become very intense. As a result, increasingly high barriers are being erected to the entry of new products. In addition, in some countries, cross-border imports from low-priced markets exert a commercial pressure on pricing within a country. Accordingly, in markets outside the United States, the reimbursement for our products may be reduced compared with the United States and may be insufficient to generate commercially reasonable revenue and profits.

The marketability of any product candidates for which we receive regulatory approval for commercial sale may suffer if the government and third-party payors fail to provide coverage and adequate reimbursement. In addition, emphasis on managed care in the United States has increased and we expect will continue to increase the pressure on healthcare pricing. Coverage policies and third-party reimbursement rates may change at any time. These and other actions by federal and state governments and health plans may put additional downward pressure on pharmaceutical pricing and health care costs, which could negatively impact coverage and reimbursement for our

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products if approved, our revenue, and our ability to compete with other marketed products and to recoup the costs of our research and development. Even if favorable coverage and reimbursement status is attained for one or more products for which we receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.

Healthcare Reform

In the United States and some foreign jurisdictions, there have been, and continue to be, several legislative and regulatory changes and proposed changes regarding the healthcare system that could prevent or delay marketing approval of product candidates, restrict or regulate post-approval activities and affect the ability to profitably sell product candidates for which marketing approval is obtained. Among policy makers and payors in the United States and elsewhere, there is significant interest in promoting changes in healthcare systems with the stated goals of containing healthcare costs, improving quality and/or expanding access. In the United States, the pharmaceutical industry has been a particular focus of these efforts and has been significantly affected by major legislative initiatives.

For example, the ACA has substantially changed healthcare financing and delivery by both governmental and private insurers. Among the ACA provisions of importance to the pharmaceutical and biotechnology industries, in addition to those otherwise described above, are the following:

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There have been executive, legal and political challenges to certain aspects of the ACA. For example, in

December 2017, Congress repealed the tax penalty for an individual’s failure to maintain ACA -mandated health insurance as part of the Tax Cuts and Jobs Act of 2017 (the “Tax Act”), effective January 1, 2019. In addition, the 2020 federal spending package permanently eliminated, effective January 1, 2020, the ACA-mandated “Cadillac” tax on high-cost employer-sponsored health coverage and medical device tax and, effective January 1, 2021, also eliminated the health insurer tax. On June 17, 2021 the U.S. Supreme Court dismissed a challenge on procedural grounds that argued the ACA is unconstitutional in its entirety because the “individual mandate” was repealed by Congress. Prior to the U.S. Supreme Court ruling, on January 28, 2021, President Biden issued an executive order that initiated a special enrollment period for purposes of obtaining health insurance coverage through the ACA marketplace. The executive order also instructed certain governmental agencies to review and reconsider their existing policies and rules that limit access to healthcare, including among others, reexamining Medicaid demonstration projects and waiver programs that include work requirements, and policies that create unnecessary barriers to obtaining access to health insurance coverage through Medicaid or the ACA. In addition, on August 16, 2022, President Biden signed the Inflation Reduction Act of 2022 (“IRA”) into law, which among other things, extends enhanced subsidies for individuals purchasing health insurance coverage in ACA marketplaces through plan year 2025. The IRA also eliminates the “donut hole” under the Medicare Part D program beginning in 2025 by significantly lowering the beneficiary maximum out-of-pocket cost and creating a new manufacturer discount program. It is possible that the ACA will be subject to judicial or Congressional challenges in the future. It is unclear how such challenges and the healthcare reform measures of the Biden administration will impact the ACA and our business.

Further legislation or regulation could be passed that could harm our business, financial condition and results of operations. Other legislative changes have been proposed and adopted since the Affordable Care Act was enacted. For example, in August 2011, the Budget Control Act of 2011 was signed into law, which, among other things, included aggregate reductions to Medicare payments to providers of 2% per fiscal year and, due to subsequent legislative amendments to the statute, including the Infrastructure Investment and Jobs Act, will stay in effect until 2031, unless additional Congressional action is taken. Under current legislation the actual reduction in Medicare payments will vary from 1% in 2022 to up to 4% in the final fiscal year of this sequester. Further, in January 2013, the American Taxpayer Relief Act of 2012 was signed into law, which, among other things, further reduced Medicare payments to several types of providers, including hospitals, imaging centers and cancer treatment centers, and increased the statute of limitations period for the government to recover overpayments to providers from three to five years.
 

Additionally, there has been increasing legislative and enforcement interest in the United States with respect to specialty drug pricing practices. Specifically, there have been several recent U.S. Congressional inquiries and proposed and enacted federal legislation designed to, among other things, bring more transparency to drug pricing, reduce the cost of prescription drugs under Medicare, review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for drugs. At the federal level, in July 2021, the Biden administration released an executive order, “Promoting Competition in the American Economy,” with multiple provisions aimed at prescription drugs. In response to Biden’s executive order, on September 9, 2021, HHS released a Comprehensive Plan for Addressing High Drug Prices that outlines principles for drug pricing reform and sets out a variety of potential legislative policies that Congress could pursue as well as potential administrative actions HHS can take to advance these principles. In addition, the IRA, among other things, (i) directs HHS to negotiate the price of certain high-expenditure, single-source drugs and biologics covered under Medicare, and subject drug manufacturers to civil monetary penalties and a potential excise tax by offering a price that is not equal to or less than the negotiated “maximum fair price” for such drugs and biologics under the law, and (ii) imposes rebates with respect to certain drugs and biologics covered under Medicare Part B or Medicare Part D to penalize price increases that outpace inflation. The IRA permits HHS to implement many of these provisions through guidance, as opposed to regulation, for the initial years. These provisions will take effect progressively starting in fiscal year 2023, although they may be subject to legal challenges. It is currently unclear how the IRA will be implemented but is likely to have a significant impact on the pharmaceutical industry. Further, the Biden administration released an additional executive order on October 14, 2022, directing HHS to submit a report on how the Center for Medicare and Medicaid Innovation can be further leveraged to test new models for lowering drug costs for Medicare and Medicaid beneficiaries. It is unclear whether this executive order or similar policy initiatives

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will be implemented in the future. Individual states in the United States have also become increasingly active in passing legislation and implementing regulations designed to control pharmaceutical and biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing.
 

The Foreign Corrupt Practices Act

The Foreign Corrupt Practices Act (“FCPA”) prohibits any U.S. individual or business from paying, offering or authorizing payment or offering of anything of value, directly or indirectly, to any foreign official, political party or candidate for the purpose of influencing any act or decision of the foreign entity in order to assist the individual or business in obtaining or retaining business. The FCPA also obligates companies whose securities are listed in the United States to comply with accounting provisions requiring the company to maintain books and records that accurately and fairly reflect all transactions of the corporation, including international subsidiaries, and to devise and maintain an adequate system of internal accounting controls for international operations.

Additional Regulation

In addition to the foregoing, state and federal laws regarding environmental protection and hazardous substances, including the Occupational Safety and Health Act, the Resource Conservancy and Recovery Act and the Toxic Substances Control Act, affect our business. These and other laws govern our use, handling and disposal of various biological, chemical and radioactive substances used in, and wastes generated by, our operations. If our operations result in contamination of the environment or expose individuals to hazardous substances, we could be liable for damages and governmental fines. We believe that we are in material compliance with applicable environmental laws and that continued compliance therewith will not have a material adverse effect on our business. We cannot predict, however, how changes in these laws may affect our future operations.

Europe/Rest of World Government Regulation

In addition to regulations in the United States, we will be subject to a variety of regulations in other jurisdictions governing, among other things, clinical trials and any commercial sales and distribution of our products. Whether or not we obtain FDA approval of a product, we must obtain the requisite approvals from regulatory authorities in foreign countries prior to the commencement of clinical trials or marketing of the product in those countries. Certain countries outside of the United States have a similar process that requires the submission of a clinical trial application much like the IND prior to the commencement of human clinical trials. In the EU, for example, a clinical trial application must be submitted to each country’s national health authority and an independent ethics committee, much like the FDA and IRB, respectively. Once the clinical trial application is approved in accordance with a country’s requirements, clinical trial development may proceed. Because biologically sourced raw materials are subject to unique contamination risks, their use may be restricted in some countries. Additionally, for cell and gene therapy products, the requirements for review and approval of genetically modified Organisms prior to clearance of a clinical trial application in Europe and other parts of the world are more time-consuming than in the United States and may delay initiation of clinical trials in these countries.

The requirements and process governing the conduct of clinical trials, product licensing, pricing and reimbursement vary from country to country. In all cases, the clinical trials must be conducted in accordance with GCP and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki.

To obtain regulatory approval of an investigational drug or biological product under EU regulatory systems, we must submit a Marketing Authorisation Application. The application used to file the BLA in the United States is similar to that required in the EU, with the exception of, among other things, country-specific document requirements. Also, with the withdrawal of the United Kingdom from the EU, the requirements in the United Kingdom now need to be addressed separately.

For other countries outside of the EU, such as countries in Eastern Europe, Latin America or Asia, the requirements governing the conduct of clinical trials, product licensing, pricing and reimbursement vary from country to country. In all cases, again, the clinical trials must be conducted in accordance with GCP and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki.

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If we or our potential collaborators fail to comply with applicable foreign regulatory requirements, we may be subject to, among other things, fines, suspension or withdrawal of regulatory approvals, product recalls, seizure of products, operating restrictions and criminal prosecution.

Employees and Human Capital Resources

Our human capital is integral to helping us achieve our mission of developing transformative treatments for patients suffering from hematological malignancies. We have built a culture of high performance based on our core values:

Our human capital objectives include, as applicable, identifying, recruiting, retaining, incentivizing and integrating our existing and additional employees. The principal purposes of our equity incentive plans are to attract, retain and motivate selected employees, consultants and directors through the granting of stock-based compensation awards.

As of March 1, 2023, we had 133 full-time employees, 41 of whom held an M.D. or Ph.D. degree and 107 of whom are engaged in research and development activities. None of our employees are represented by a labor union or covered by a collective bargaining agreement. We consider our relationship with our employees to be good.

Corporate Information

Our principal executive offices are located at 100 Cambridgepark Drive, Suite 101, Cambridge, Massachusetts 02140 and our telephone number is 617-655-6580.

Available Information

We maintain an internet website at www.vorbio.com and make available free of charge through our website our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Sections 13(a) and 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). We make these reports available through our website as soon as reasonably practicable after we electronically file such reports with, or furnish such reports to, the Securities and Exchange Commission (the “SEC”). You can review our electronically filed reports and other information that we file with the SEC on the SEC’s web site at http://www.sec.gov. We also make available, free of charge on our website, the reports filed with the SEC by our executive officers, directors and 10% stockholders pursuant to Section 16 under the Exchange Act as soon as reasonably practicable after copies of those filings are provided to us by those persons. In addition, we regularly use our website to post information regarding our business, product development programs and governance, and we encourage investors to use our website, particularly the information in the section entitled “Investors,” as a source of information about us.

The information on our website is not incorporated by reference into this Annual Report and should not be considered to be a part of this Annual Report. Our website address is included in this Annual Report as an inactive technical reference only.

Investors and others should note that we announce material information to our investors using one or more of the following: SEC filings, press releases and our corporate website, including without limitation the “Investors” and “Events and Presentations” sections of our website. We use these channels, as well as social media channels such as LinkedIn, in order to achieve broad, non-exclusionary distribution of information to the public and for complying with our disclosure obligations under Regulation FD. It is possible that the information we post on our corporate website or other social media could be deemed to be material information. Therefore, we encourage investors, the media, and others interested in our company to review the information we post on the “Investors” and “Events and Presentations” sections of our corporate website and on our social media channels. The contents of our corporate website and social media channels are not, however, a part of this Annual Report.

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Item 1A. Risk Factors.

The following risk factors and other information included in this Annual Report on Form 10-K (“Annual Report”), including our financial statements and related notes thereto, should be carefully considered. The risks and uncertainties described below are not the only risks and uncertainties we face. Additional risks and uncertainties not presently known to us or that we presently deem less significant may also impair our business operations. Please see the discussion regarding some of the forward-looking statements that are qualified by these risk factors contained elsewhere in this Annual Report. If any of the following risks occur, our business, financial condition, results of operations and future growth prospects could be materially and adversely affected.

Risks Related to Our Financial Position and Need for Additional Capital

We have incurred significant net losses since inception. We expect to incur net losses for the foreseeable future and may never achieve or maintain profitability.

Since inception, we have not generated any revenue and have incurred significant operating losses. For the years ended December 31, 2022 and 2021, our net loss was $92.1 million and $68.9 million, respectively. As of December 31, 2022, we had an accumulated deficit of $222.2 million. We have financed our operations primarily through the sale of our capital stock. We have devoted all of our efforts to organizing and staffing our company, business and scientific planning, raising capital, acquiring and developing technology, identifying potential product candidates, undertaking studies of potential product candidates, developing manufacturing capabilities and evaluating a clinical path for our pipeline programs. We expect to continue to incur significant expenses and increasing operating losses for the foreseeable future. The net losses we incur may fluctuate significantly from quarter to quarter. We anticipate that our expenses will increase substantially if and as we:

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We have not completed clinical development of any product candidate and expect that it will be several years, if ever, before we have a product candidate ready for commercialization. To become and remain profitable, we must develop and, either directly or through collaborators, eventually commercialize a product or products with significant market potential. This will require us to be successful in a range of challenging activities, including identifying product candidates, completing preclinical testing and clinical trials of product candidates, obtaining marketing approval for these product candidates, manufacturing, marketing and selling those products for which we may obtain marketing approval and satisfying any post-marketing requirements. We may never succeed in these activities and, even if we do, may never generate revenues that are significant or large enough to achieve profitability. Our product candidates and research programs are currently only in the early stages of development. Because of the numerous risks and uncertainties associated with developing product candidates, we are unable to predict the extent of any future losses or when we will become profitable, if at all. If we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Our failure to become and remain profitable would decrease the value of our company and could impair our ability to raise capital, maintain our research and development efforts, expand our business or continue our operations. A decline in the value of our company could also cause our stockholders to lose all or part of their investments in us.

We will need substantial additional funding. If we are unable to raise capital when needed, we would be forced to delay, reduce or eliminate our research and product development programs or future commercialization efforts.

We expect our expenses to increase in connection with our ongoing activities, particularly as we continue the clinical development of trem-cel in acute myeloid leukemia (“AML”), advance our VCAR33 programs through clinical development, initiate clinical development of the trem-cel in combination or in sequence with VCAR33ALLO as a targeted therapeutic, which we refer to as the trem-cel + VCAR33 Treatment System, and otherwise continue to advance our research programs in support of our pipeline. In addition, if we obtain marketing approval for any of our product candidates, we expect to incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution to the extent that such sales, marketing, manufacturing and distribution are not the responsibility of a collaborator. In addition, we expect to continue to incur significant additional costs associated with operating as a public company this year and in future years. Accordingly, we will need to obtain substantial additional funding in order to maintain our continuing operations. If we are unable to raise capital when needed or on attractive terms, we would be forced to delay, reduce or eliminate our research and product development programs or future commercialization efforts.

As of December 31, 2022, our cash, cash equivalents and marketable securities were $230.2 million. We expect that our existing cash, cash equivalents and marketable securities as of December 31, 2022 will enable us to fund our operating expenses and capital expenditure requirements into the first quarter of 2025. However, our operating plan may change as a result of factors currently unknown to us, and we may need to seek funding sooner than planned. Our future capital requirements will depend on many factors, including:

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Conducting preclinical testing and clinical trials is a time-consuming, expensive and uncertain process that takes years to complete, and we may never generate the necessary data or results required to obtain marketing approval and achieve product sales. In addition, even if we successfully develop product candidates and those are approved, we may not achieve commercial success. Our commercial revenues, if any, will be derived from sales of products that we do not expect to be commercially available for several years, if at all. Accordingly, we will need to continue to rely on additional financing to achieve our business objectives.

Any additional fundraising efforts may divert our management from their day-to-day activities, which may adversely affect our ability to develop and commercialize product candidates. We cannot be certain that additional funding will be available on acceptable terms, or at all. We have no committed source of additional capital and, if we are unable to raise additional capital in sufficient amounts or on terms acceptable to us, we may have to significantly delay, scale back or discontinue the development or commercialization of product candidates or other research and development initiatives. Our license agreements and any future collaboration agreements may also be terminated if we are unable to meet the payment or other obligations under the agreements. We could be required to seek collaborators for product candidates at an earlier stage than otherwise would be desirable or on terms that are less favorable than might otherwise be available or relinquish or license on unfavorable terms our rights to product candidates in markets where we otherwise would seek to pursue development or commercialization ourselves.

If we are unable to obtain funding on a timely basis, we may be required to significantly curtail, delay or discontinue one or more of our research or development programs or the commercialization of any product candidate, or be unable to expand our operations or otherwise capitalize on our business opportunities, as desired, which could materially affect our business, financial condition and results of operations. Any of the above events could significantly harm our business, prospects, financial condition and results of operations and cause the price of our common stock to decline.

Raising additional capital may cause dilution to our stockholders, restrict our operations or require us to relinquish rights to our technologies or product candidates.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity offerings, government or private party grants, debt financings, collaborations, strategic alliances and licensing arrangements. We do not currently have any committed external source of funds. To the extent that we raise additional capital through the sale of equity or convertible debt securities, including through the use of our at-the-market facility, our stockholders’ ownership interest will be diluted, and the terms of these

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securities may include liquidation or other preferences that adversely affect rights of our common stockholders. Debt financing and preferred equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures, declaring dividends and possibly other restrictions.

If we raise funds through collaborations, strategic alliances or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates, or we may have to grant licenses on terms that may not be favorable to us or commit to providing us with future payment streams. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves. Market volatility resulting from the COVID-19 pandemic or other factors may further adversely impact our ability to access capital as and when needed.

We have a limited operating history, have not yet completed any clinical trials and have no history of commercializing products, which may make it difficult to evaluate the success of our business to date and to assess our future viability.

We are an early-stage company. We were founded in December 2015 and commenced operations in February 2016. Our operations to date have been limited to organizing and staffing our company, business planning, raising capital, acquiring and developing our platform and technology, identifying product candidates and undertaking studies. For example, VBP101, our Phase 1/2a multicenter, open-label, first-in-human study of trem-cel in patients with AML, is in the early stages and, to date, we have released initial data for two patients, we have not yet submitted an Investigational New Drug (“IND”) application for our VCAR33ALLO program and our other programs are still in the preclinical or research stage. The risk of failure for these activities is high. We have not yet demonstrated an ability to successfully complete any clinical trials, including large-scale, pivotal clinical trials, obtain marketing approvals, manufacture a commercial-scale product or arrange for a third party to do so on our behalf or conduct sales and marketing activities necessary for successful commercialization. For example, in September 2022, we initiated in-house manufacturing to produce supplies to support the IND for VCAR33ALLO at our Cambridge, MA headquarters, but the success of our in-house manufacturing capabilities and efforts has not yet been proven and we may fail to fully realize the cost-savings and efficiency gains that we expect. Consequently, any predictions made about our future success or viability may not be as accurate as they could be if we had a longer operating history.

Our limited operating history may make it difficult to evaluate our technology and industry and predict our future performance. Our short history as an operating company makes any assessment of our future success or viability subject to significant uncertainty. We expect to encounter risks and difficulties frequently experienced by early stage companies in new and rapidly evolving fields. If we do not address these risks and difficulties successfully, our business could suffer.

In addition, as a new business, we may encounter other unforeseen expenses, difficulties, complications, delays and other known and unknown factors. We will need to transition from a company with a research focus to a company capable of supporting commercial activities. We may not be successful in such a transition.

We have never generated revenue from product sales and may never become profitable.

Our ability to generate revenue from product sales and achieve profitability depends on our ability, alone or with collaborators, to successfully complete the development of, and obtain the regulatory approvals necessary to commercialize, product candidates. We do not anticipate generating revenues from product sales for the next several years, if ever. Our ability to generate future revenue from product sales depends heavily on our, or our current or future collaborators’, ability to successfully:

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Even if one or more of the product candidates we develop are approved for commercial sale, we anticipate incurring significant costs associated with commercializing any approved product candidate. Our expenses could increase beyond expectations if we are required by the U.S. Food and Drug Administration (the “FDA”), the European Medicines Agency (the “EMA”) or other regulatory authorities to perform clinical and other studies in addition to those that we currently anticipate. Even if we are able to generate revenues from the sale of any approved product candidates, we may not become profitable and may need to obtain additional funding to continue operations.

Even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Our failure to become and remain profitable would decrease the value of our company and could impair our ability to raise capital, maintain our research and development efforts, expand our business or continue our operations. A decline in the value of our company also could cause stockholders to lose all or part of their investment in us.

Our ability to utilize our net operating loss carryforwards and certain other tax attributes to offset taxable income or taxes may be limited.

As of December 31, 2022, we had gross federal net operating loss carryforwards of $153.6 million including $151.7 million that had an indefinite carryforward period and $1.9 million that were subject to expiration at various dates through 2037. Furthermore, we have state and local net operating loss carryforwards of $141.1 million which will expire at various dates through 2042. Portions of these net operating loss carryforwards could expire unused and be unavailable to offset future income tax liabilities. Under the legislation enacted in 2017, informally titled the Tax Cuts and Jobs Act (the “Tax Act”), as modified by the Coronavirus Aid, Relief, and Economic Security (the “CARES Act”) U.S. federal net operating losses incurred in taxable years beginning after December 31, 2017, may be carried forward indefinitely, but the deductibility of such federal net operating losses in taxable years beginning

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after December 31, 2020, may be limited. It is uncertain how various states will respond to the Tax Act and the CARES Act. For state income tax purposes, there may be periods during which the use of net operating loss carryforwards is suspended or otherwise limited, which could accelerate or permanently increase state taxes owed. In addition, under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended (the “Code”), and corresponding provisions of state law, if a corporation undergoes an “ownership change,” which is generally defined as a greater than 50% change, by value, in its equity ownership over a three-year period, the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes to offset its post-change income or taxes may be limited. The completion of our initial public offering, together with private placements and other transactions that have occurred since our inception, may trigger such an ownership change pursuant to Section 382 of the Code. We have not yet completed a Section 382 analysis, and therefore, there can be no assurances that our net operating losses are not already limited. We may experience ownership changes as a result of subsequent shifts in our stock ownership, some of which may be outside of our control. If an ownership change occurs and our ability to use our net operating loss carryforwards is materially limited, it would harm our future operating results by effectively increasing our future tax obligations. There is a full valuation allowance for net deferred tax assets, including net operating loss carryforwards.

Risks Related to Discovery, Development, Manufacturing and Commercialization

eHSCs are a novel technology that is not yet clinically validated for human use. The approaches we are taking to create eHSCs are unproven and may never lead to marketable products.

We are developing trem-cel and other eHSCs for transplant into the human body. Although there have been significant advances in the field of genome engineering in recent years, these technologies have rarely been applied to hematopoietic stem cells (“HSCs”), and our approach is new and largely unproven. The scientific evidence to support the feasibility of developing eHSCs is both preliminary and limited. Successful development of eHSCs by us will require solving a number of challenges, including:

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We have concentrated our research efforts to date on preclinical work to bring trem-cel into clinical development for the treatment of AML, and our future success is highly dependent on the successful development of eHSCs, such as trem-cel, and the therapeutic applications of these cells. We may decide to alter or abandon our initial programs as new data become available and we gain experience in developing eHSCs. We cannot be sure that our programs will yield satisfactory products that are safe and effective, scalable or profitable in our initial indication or any other indication we pursue.

Moreover, actual or perceived safety issues, including as a result of adverse developments in our eHSC programs or in genome engineering programs undertaken by third parties or of the adoption of novel approaches to treatment, may adversely influence the willingness of subjects to participate in our clinical trials, or, if one of our product candidates is approved by applicable regulatory authorities, of physicians to subscribe to the novel treatment mechanics or of patients to provide consent to receive a novel treatment despite its regulatory approval. The FDA or other applicable regulatory authorities may require specific post-market studies or additional information that communicates the benefits or risks of our products. New data may reveal new risks of our product candidates at any time prior to or after regulatory approval.

We are substantially dependent on the success of our two most advanced product candidates, trem-cel and VCAR33ALLO. If we are unable to complete development of, obtain approval for and commercialize trem-cel or VCAR33ALLO in a timely manner, our business will be harmed.

Our future success is dependent on our ability to timely advance and complete clinical trials, obtain marketing approval for and successfully commercialize our product candidates trem-cel and VCAR33ALLO. We are investing significant efforts and financial resources in the research and development of these product candidates. We released initial clinical data from VBP101, our Phase 1/2a multicenter, open-label, first-in-human trial of trem-cel in combination with Mylotarg in patients with AML, in December 2022 and February 2023 based on two patients and we are only in the early stages of advancing VCAR33ALLO through clinical development. VCAR33AUTO, a CAR-T substantially similar to our VCAR33ALLO program that uses autologous cells from each patient, as opposed to using allogeneic healthy donor-derived cells like our VCAR33ALLO program, is also undergoing a multi-site, investigator-initiated Phase 1/2 clinical trial in relapsed AML patients as a monotherapy in a bridge-to-transplant setting. This trial is currently sponsored and overseen by the National Marrow Donor Program (“NMDP”). Trem-cel and VCAR33ALLO will each require additional clinical development, evaluation of clinical, preclinical and manufacturing activities, marketing approval from government regulators, substantial investment and significant marketing efforts before we can generate any revenues from product sales. We are not permitted to market or promote trem-cel, VCAR33ALLO or any other product candidate, before we receive marketing approval from the FDA and comparable foreign regulatory authorities, and we may never receive such marketing approvals.

The success of trem-cel and VCAR33ALLO will depend on several factors, including the following:

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We do not have complete control over many of these factors, including certain aspects of clinical development and the regulatory submission process, potential threats to our intellectual property rights and the manufacturing, marketing, distribution and sales efforts of any future collaborator. If we are not successful with respect to one or more of these factors in a timely manner or at all, we could experience significant delays or an inability to successfully commercialize trem-cel and/or VCAR33ALLO, which would materially harm our business. If we do not receive marketing approvals for trem-cel and VCAR33ALLO we may not be able to continue our operations.

We may not be successful in our efforts to identify, develop and commercialize additional product candidates. If these efforts are unsuccessful, we may never become a commercial stage company or generate any revenues.

The success of our business depends primarily upon our ability to identify, develop and commercialize additional product candidates based on, or complementary with, our technology platform. Other than trem-cel, all of our other product development programs are still in the research or preclinical stage of development. Our research programs may fail to identify additional product candidates for clinical development for a number of reasons. Our research methodology may be unsuccessful in identifying potential product candidates, our potential product candidates may be shown to have harmful side effects in preclinical in vitro experiments or animal model studies,

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they may not show promising signals of efficacy in such experiments or studies or they may have other characteristics that may make the product candidates impractical to manufacture, unmarketable or unlikely to receive marketing approval. The historical failure rate for product candidates is high due to risks relating to safety, efficacy, clinical execution, changing standards of medical care and other unpredictable variables. In addition, although we believe our technology platform will position us to rapidly expand our portfolio of product candidates beyond our current product candidates, our ability to expand our portfolio may never materialize.

If any of these events occur, we may be forced to abandon our research or development efforts for a program or programs, which would have a material adverse effect on our business, financial condition, results of operations and prospects. Research programs to identify new product candidates require substantial technical, financial and human resources. We may focus our efforts and resources on potential programs or product candidates that ultimately prove to be unsuccessful, which would be costly and time-consuming.

If our product candidates, the delivery modes we rely on to administer them, and/or the conditioning, administration process or related procedures or treatments which may be used alongside our product candidates cause serious adverse events, undesirable side effects or unexpected characteristics, such events, side effects or characteristics could delay or prevent regulatory approval of the product candidates, limit their commercial potential or result in significant negative consequences following any potential marketing approval, even if these side effects or characteristics are unrelated to our product candidate.

We have not yet completed any human clinical trials of our product candidates and it is impossible to predict when or if our product candidates will prove safe in humans. Undesirable side effects caused by our product candidates could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in a more restrictive label or the delay or denial of regulatory approval by the FDA or comparable foreign regulatory authorities. Results of our clinical trials could reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics.

There have been no clinical trials of eHSCs and a limited number of clinical trials of certain of the technologies we are using to engineer eHSCs and chimeric antigen receptor (“CAR”)-T cells, including the CRISPR/Cas9 method we are using in our trem-cel program. In the genetic medicine field, there have been several significant adverse events from genetically engineered treatments in the past, including reported cases of leukemia and death. There have also been recent studies suggesting that genome engineering using the CRISPR-Cas9 method may increase the risk that the modified cells themselves become cancerous or otherwise dysfunctional. There can be no assurance that our eHSCs or CAR-T cells and the genome engineering techniques that we may employ in their development will not cause undesirable side effects, as improper modification of a patient’s DNA could lead to lymphoma, leukemia or other cancers, or other aberrantly functioning cells.

A significant risk in any genetically engineered product candidate is that “off-target” gene alterations may occur, which could cause serious adverse events, undesirable side effects or unexpected characteristics. Although we and others have demonstrated the ability to improve the specificity of gene alterations in a laboratory setting, we cannot be certain that off-target alterations will not occur in any of our planned or future clinical trials, and the lack of observed side effects in preclinical studies does not guarantee that such side effects will not occur in human clinical trials.

There is also the potential risk of delayed adverse events following exposure to genetically engineered cells due to the permanence of changes to DNA or due to other components of product candidates used to carry the genetic material. Further, because our genome engineering technology makes a permanent change, the treatment cannot be withdrawn, even after a side effect is observed. For example, our eHSCs are designed to permanently reconstitute the blood cells necessary for the survival of HSCT patients, and we cannot be certain that these changes will not induce adverse reactions in patients or impair the functionality of the resulting blood cells. The eHSC manufacturing process generally, and the removal of surface targets such as CD33 specifically, could have temporary or permanent harmful effects. The removal of CD33 from HSCs has never been studied in clinical trials. While we have discovered anonymous individuals in genome databases who lack CD33, we cannot be certain that these databases are accurate or complete or that the individuals who have contributed DNA to the database are healthy, as comprehensive health information is not included in the databases we have consulted. The removal of CD33 or other surface targets we remove from HSCs could have serious harmful effects, including the impairment

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of the ability of our eHSCs to migrate to patients’ bone marrow, survive and reconstitute properly functioning blood cells. These side effects may not be evident for years after transplant.

In addition to side effects and adverse events that may be caused by our eHSCs, HSCT is itself a complicated and risky procedure. The conditioning, administration process or related procedures which may be used in HSCT can cause adverse side effects and adverse events. An HSCT patient is generally administered cytotoxic drugs to remove stem cells from the bone marrow to create sufficient space in the bone marrow for the modified stem cells to engraft and produce new cells. This procedure compromises the patient’s immune system. In addition, the HSCs administered via transplant may fail to engraft in patients’ bone marrow, or could be rejected by the patient, either of which could result in serious side effects, including death. If in the future we are unable to demonstrate that such adverse events were caused by the elements of the HSCT process unrelated to our eHSCs, the FDA, the European Commission, the Competent Authorities of the Member States of the European Union, EMA or other regulatory authorities could order us to cease further development of, or deny approval of, our eHSCs for any or all target indications. Even if we are able to demonstrate that adverse events are not related to our product candidates, or are merely a feature of HSCT generally, such occurrences could affect patient recruitment, the ability of enrolled patients to complete the clinical trial, or the commercial viability of any product candidates that obtain regulatory approval.

Furthermore, in previous and ongoing clinical trials involving CAR-T or other cell-based therapies from other companies, patients experienced side effects such as neurotoxicity and cytokine release syndrome. There have been life threatening events related to severe neurotoxicity and cytokine release syndrome, requiring intense medical intervention such as intubation or pressor support, and in several cases, resulting in death. Severe neurotoxicity is a condition that is currently defined clinically by cerebral edema, confusion, drowsiness, speech impairment, tremors, seizures, or other central nervous system side effects, when such side effects are serious enough to lead to intensive care. In some cases, severe neurotoxicity was thought to be associated with the use of certain lymphodepletion regimens used prior to the administration of the CAR-T or other cell-based therapies. Cytokine release syndrome is a condition that is currently defined clinically by certain symptoms related to the release of cytokines, which can include fever, chills, low blood pressure, when such side effects are serious enough to lead to intensive care with mechanical ventilation or significant vasopressor support. The exact cause or causes of cytokine release syndrome and severe neurotoxicity in connection with treatment of CAR-T or other cell-based therapies is not fully understood at this time. In addition, patients have experienced other adverse events in these trials, such as a reduction in the number of blood cells (in the form of neutropenia, thrombocytopenia, anemia or other cytopenias), febrile neutropenia, chemical laboratory abnormalities (including elevated liver enzymes) and renal failure.

The delivery modalities of certain of our product candidates may also cause serious adverse events. For example, in order to administer VCAR33ALLO, we employ viral vectors, including lentiviruses, which are relatively new approaches used for disease treatment. In past clinical trials that were conducted by others with lentivirus vectors, several significant side effects were caused by gene therapy treatments, including reported cases of leukemia and death. Other potential side effects could include an immunologic reaction and insertional oncogenesis, which is the process whereby the insertion of a functional gene near a gene that is important in cell growth or division results in uncontrolled cell division, which could potentially enhance the risk of malignant transformation. If the vectors we use demonstrate a similar side effect, or other adverse events, we may be required to halt or delay further clinical development of VCAR33ALLO and potential product candidates. Furthermore, the FDA has stated that lentiviral vectors possess characteristics that may pose high risks of delayed adverse events.

Undesirable side effects caused by VCAR33AUTO, VCAR33ALLO or other cell-based targeted therapeutics we may develop could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in a more restrictive label or the delay or denial of marketing approval by the FDA or other comparable foreign regulatory authorities. In some cases, side effects such as neurotoxicity or cytokine release syndrome have resulted in clinical holds of ongoing clinical trials and/or discontinuation of the development of the product candidate. Results of our studies could reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics. Treatment-related side effects could also affect patient recruitment or the ability of enrolled patients to complete the trials or result in potential product liability claims. In addition, these side effects may not be appropriately recognized or managed by the treating medical staff, as toxicities resulting from T cell-based immunotherapies are not normally encountered in the general patient population and by medical personnel. Medical personnel may need additional training regarding T cell-based immunotherapy product candidates to understand

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their side effects. Inadequate training in recognizing or failure to effectively manage the potential side effects of T cell-based immunotherapy product candidates could result in patient deaths. Any of these occurrences may harm our business, financial condition and prospects significantly.

If any product candidates we develop are associated with serious adverse events, undesirable side effects or unexpected characteristics, we may need to abandon their development or limit development to certain uses or subpopulations in which the serious adverse events, undesirable side effects or other characteristics are less prevalent, less severe or more acceptable from a risk-benefit perspective, any of which would have a material adverse effect on our business, financial condition, results of operations, and prospects. Many product candidates that initially showed promise in early stage testing have later been found to cause side effects that prevented further clinical development of the product candidates.

Additionally, if we successfully develop a product candidate and it receives marketing approval, the FDA could require us to adopt a Risk Evaluation and Mitigation Strategy (“REMS”), to ensure that the benefits of treatment with such product candidate outweighs the risks for each potential patient, which may include, among other things, a medication guide outlining the risks of the product for distribution to patients, a communication plan to health care practitioners, extensive patient monitoring or distribution systems and processes that are highly controlled, restrictive and more costly than what is typical for the industry. Furthermore, if we or others later identify undesirable side effects caused by a product candidate, several potentially significant negative consequences could result, including:

Any of these events could prevent us from achieving or maintaining market acceptance of product candidates and could have a material adverse effect on our business, financial condition, results of operations and prospects.

We have not successfully tested our product candidates in clinical trials and any favorable preclinical results are not predictive of results that may be observed in clinical trials.

We have not successfully tested our product candidates in clinical trials, and there is a high failure rate for drugs and biologics proceeding through clinical trials. A number of companies in the pharmaceutical and biotechnology industries have suffered significant setbacks in later stage clinical trials even after achieving promising results in earlier stage clinical trials. Data obtained from preclinical and clinical activities are subject to varying interpretations, which may delay, limit or prevent regulatory approval. In addition, regulatory delays or rejections may be encountered as a result of many factors, including changes in regulatory policy during the period of product development. Any such adverse events may cause us to delay, limit or terminate planned clinical trials, any of which would have a material adverse effect on our business, financial condition, results of operations and prospects.

In addition, the results of preclinical studies may not be predictive of the results of later-stage preclinical studies or clinical trials. To date, we have generated only limited preclinical study data and no clinical trial results, and any such data or results do not ensure that later preclinical studies or clinical trials will produce similar outcomes. Moreover, preclinical and clinical data are often susceptible to varying interpretations and analyses, and many companies that have believed their product candidates performed satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain marketing approval of their product candidates.

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Furthermore, the IND for the T cell therapy candidate using the same CAR construct as VCAR33ALLO, which we refer to as VCAR33AUTO, is currently held, and this clinical trial is currently sponsored, by the NMDP. As such, the NMDP is responsible for all aspects of this trial, including the design of the trial, the manufacture of study product, the enrollment, dosing and follow-up of patients, the recording of trial data and the analysis of results. We also did not control the preclinical development of this T cell therapy candidate, which was conducted by the National Institutes of Health (“NIH”), and we do not have rights under the license agreement to certain intellectual property, such as know-how, employed by the NMDP in manufacturing study product or conducting its clinical trial. We have received the right to cross reference the NMDP's IND for this T cell therapy candidate in any future IND application we may make with the FDA. In the event we cross-reference these trial results, we will be required to demonstrate that our VCAR33ALLO is comparable to the T cell therapy studied in the NMDP trial, which will require us to show that our manufacturing processes and construct release specifications are sufficiently comparable to those employed in the NMDP trial. While we do not believe that we need to demonstrate comparability of our VCAR33ALLO candidate since we intend to rely on initial clinical data from our VCAR33ALLO program, if the FDA disagrees, we may have to demonstrate comparability. If we have to determine comparability, we expect the FDA to evaluate whether and to what extent any changes in our process and specifications are likely to have an adverse effect on the quality, safety and efficacy of VCAR33 in comparison to the T cell therapy studied in the NMDP trial. We may be unable to establish the comparability of the product candidate investigated under the NMDP IND and our IND for VCAR33ALLO in the event of manufacturing changes, or the FDA or other regulatory authorities may otherwise disagree with the sufficiency of our right of reference to the preclinical, manufacturing or clinical data generated by the NMDP’s trial or our interpretation of preclinical, manufacturing or clinical data from this trial. If so, regulatory authorities may require us to obtain and submit additional preclinical, manufacturing or clinical data before we may initiate further clinical trials and/or obtain any regulatory approvals. For example, we may be required to conduct additional preclinical toxicology studies, requalify manufacturing processes or conduct further clinical investigation of VCAR33ALLO before advancing our VCAR33ALLO program.

We are also relying on NIH to have conducted its research and development efforts, and on the NMDP to conduct its clinical trial, in accordance with applicable protocol, legal, regulatory and scientific standards, to accurately report the results of preclinical studies and clinical trials, and to correctly collect and interpret the data from these studies and trials. To the extent any of these has not occurred or does not occur, the expected time and costs of developing our VCAR33ALLO program, as well as the trem-cel + VCAR33 Treatment System, may be increased, which could adversely affect our business. Furthermore we do not control the timing of the ongoing NMDP trial or the release of information about the trial, including trial results, all of which negatively affect our ability to accurately estimate the timing of anticipated trial milestones. As a result, our estimates may prove to be inaccurate. Additionally, our ability to conduct clinical development of VCAR33ALLO could be delayed or otherwise adversely affected. The NMDP also may not publicize data from the trial in a manner that facilitates further clinical development by us, or at all. The NMDP may elect to publicize this data at a time or in a manner other than we desire or may interpret data from these trials in a manner differently than we do, any of which could harm our business.

Development of a product candidate such as trem-cel, which is intended for use in combination or in sequence with an already approved therapy, will present increased complexity and more or different challenges than development of a product candidate for use as a single agent.

We expect that our product candidate trem-cel, and any other eHSC product candidates that we may develop, will be required to be used in combination or in sequence with existing or future therapies in order to demonstrate more anti-cancer efficacy than unmodified HSCs. In particular, our Phase 1/2a clinical trial evaluates trem-cel in combination with Mylotarg and we anticipate conducting future trials of trem-cel with VCAR33ALLO as a Treatment System, and also potentially with other targeted therapies. Developing product candidates for use in combination or sequence with other therapies will present challenges. For example, the FDA may require us to use more complex clinical trial designs to evaluate the contribution of each product and product candidate to any observed effects. Moreover, following product approval, the FDA may require that products used in conjunction with each other be cross-labeled, which would require consent from the sponsoring company. To the extent that we do not have rights to already approved products, this may require us to work with another company to satisfy such a requirement. For example, we do not have and do not currently plan to enter into a cross-labeling agreement with Pfizer with respect to Mylotarg, and therefore any such cross-labeling requirement from the FDA would require us to negotiate such an agreement with Pfizer. In addition, developments related to the already approved therapies may impact our clinical

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trials for the combination as well as our commercial prospects should we receive marketing approval. Such developments may include changes to the approved therapy’s safety or efficacy profile, changes to the availability of the approved therapy, changes to the standard of care and a decision by the sponsoring company to withdraw the therapy from the market. For example, Mylotarg was voluntarily withdrawn from the market in 2010 after post-approval testing indicated increased risks of hepatic veno-occlusive disease, or blockage of veins in the liver. Mylotarg was re-approved in 2017 with a lower recommended dose and for use in a new patient population. Also, while we do not currently require a license from or agreement with Pfizer to permit us to conduct clinical trials or, if approved, to commercialize trem-cel with Mylotarg as a targeted therapeutic, we do not have and do not plan to enter into a supply or license agreement with Pfizer that would require Pfizer to produce Mylotarg, or permit us to otherwise produce Mylotarg, for these purposes. If Mylotarg undergoes subsequent labeling changes, or if Mylotarg is again removed from the market due to renewed concerns about its safety profile, or for other reasons, our clinical trial of trem-cel, and our prospects for commercializing trem-cel, will be materially adversely affected. Further, we believe trem-cel could unlock the potential of anti-CD33 therapies, such as VCAR33ALLO, that are much more potent than Mylotarg and are not associated with severe myeloablative toxicities. While VBP101, our Phase 1/2a multicenter, open-label, first-in-human study of trem-cel in patients with AML, is not designed to evaluate the efficacy of the combination of trem-cel and Mylotarg, the clinical data for trem-cel in combination with Mylotarg may not reflect the potential efficacy of trem-cel in the long-term. For example, in February 2022, we announced that the first patient enrolled in VBP101 was moved to other therapies following administration of the third dose of Mylotarg due to detectable measurable residual disease, and subsequently relapsed, despite the patient maintaining neutrophil and platelet counts approximately five months after transplantation with trem-cel. Patient completion of our clinical trials could be impacted by the efficacy of Mylotarg or any other therapy administered in combination with our product candidates.

Furthermore, we will not be able to market and sell trem-cel or any product candidate we develop in combination with an unapproved cancer therapy, such as VCAR33 or other cell-based targeted therapeutics, for a combination indication, if that unapproved therapy does not ultimately obtain marketing approval either alone or in combination with our product. To our knowledge, the FDA has not previously approved combined cell therapies, and we cannot be certain whether the FDA will apply existing guidance to cell therapies product candidates, such as the trem-cel + VCAR33 Treatment System, or will otherwise apply existing guidance in novel ways. In addition, unapproved cancer therapies face the same risks described with respect to our product candidates currently in development and clinical trials, including the potential for serious adverse effects, delay in their clinical trials and lack of FDA approval. If the FDA, EMA or comparable foreign regulatory authorities do not approve these other drugs or revoke their approval of, or if safety, efficacy, quality, manufacturing or supply issues arise with, the drugs we choose to evaluate in combination with any product candidate we develop, we may be unable to obtain approval of or market such combination therapy.

Any inability to develop targeted therapies for use with our product candidate, any failure to maintain or enter into new successful commercial relationships with respect to targeted therapies, or the expense of purchasing targeted therapies in the market, may delay our development timelines, increase our costs and jeopardize our ability to develop our current product candidates and any future product candidates as commercially viable therapies. If any of these occur, our business, financial condition, results of operations, stock price and prospects may be materially harmed.

If we are unable to successfully develop our current programs into a comprehensive portfolio of product candidates, or experience significant delays in doing so, we may not realize the full commercial potential of our current and future product candidates.

We are developing trem-cel so that it can be used in combination or in sequence with other product candidates that we in-license or develop ourselves, and we are focused on a product development strategy that includes leveraging the synergies among a comprehensive portfolio of our product candidates. For example, if the initial clinical trials of trem-cel and VCAR33ALLO are each successful, we anticipate conducting clinical trials of the trem-cel + VCAR33 Treatment System, for the treatment of myeloid malignancies such as AML. Our success may depend, in part, on our ability to develop a complementary product portfolio with product candidates that will address a major limitation of existing therapies. Given our limited experience in developing product candidates that have received marketing approval, we may not be successful in developing some of our product candidates. The failure of one of our product candidates to obtain regulatory approval or market acceptance may affect our ability to

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expand our market opportunities for our other product candidates or programs. Although we may develop product candidates that ultimately obtain marketing approval, if we are unable to successfully develop our current programs into a comprehensive portfolio of product candidates, or experience significant delays in doing so, we may not realize the full commercial potential of our current and future product candidates.

We may expend our limited resources to pursue a particular product candidate or indication and fail to capitalize on product candidates or indications that may be more profitable or for which there is a greater likelihood of success.

Because we have limited financial and managerial resources, we focus on product candidates and research programs that we identify for specific indications among many potential options. As a result, we may forego or delay pursuit of opportunities with other product candidates or for other indications that later prove to have greater commercial potential. Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or profitable market opportunities. Our spending on current and future product candidates and research and development programs for specific indications may not yield any commercially viable products. If we do not accurately evaluate the commercial potential or target market for a particular product candidate, we may relinquish valuable rights to that product candidate through collaboration, licensing or other royalty arrangements in cases in which it would have been more advantageous for us to retain sole development and commercialization rights to such product candidate. Any such event could have a material adverse effect on our business, financial condition, results of operations and prospects.

Even if a product candidate receives marketing approval, it may fail to achieve the degree of market acceptance by physicians, patients, healthcare payors and others in the medical community necessary for commercial success.

The commercial success of our product candidates, if approved, will depend upon their degree of market acceptance by physicians, patients, third-party payors and others in the medical community. Ethical, social and legal concerns about genetic medicines generally and genome engineering technologies specifically could result in additional regulations restricting or prohibiting the marketing of our product candidates. Even if any product candidate we develop receives marketing approval, it may nonetheless fail to gain sufficient market acceptance by physicians, patients, healthcare payors and others in the medical community. The degree of market acceptance of any product candidate we develop, if approved for commercial sale, will depend on a number of factors, including:

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Even if a product candidate is approved, such product may not achieve an adequate level of acceptance, we may not generate significant product revenues, and we may not become profitable.

If, in the future, we are unable to establish sales and marketing capabilities or enter into agreements with third parties to sell and market our product candidates, we may not be successful in commercializing those product candidates if and when they are approved.

We do not have a sales or marketing infrastructure and have limited experience in the sale, marketing or distribution of pharmaceutical products. To achieve commercial success for any approved product for which we retain sales and marketing responsibilities, we must either develop a sales and marketing organization or outsource these functions to third parties. In the future, we may choose to build a focused sales, marketing and commercial support infrastructure to sell, or participate in sales activities with our collaborators for, some of our product candidates if and when they are approved.

There are risks involved with both establishing our own commercial capabilities and entering into arrangements with third parties to perform these services. For example, recruiting and training a sales force or reimbursement specialists is expensive and time consuming and could delay any product launch. If the commercial launch of a product candidate for which we recruit a sales force and establish marketing and other commercialization capabilities is delayed or does not occur for any reason, we would have prematurely or unnecessarily incurred these commercialization expenses. This may be costly, and our investment would be lost if we cannot retain or reposition our commercialization personnel.

Factors that may inhibit our efforts to commercialize our product candidates on our own include:

If we enter into arrangements with third parties to perform sales, marketing, commercial support and distribution services, our product revenues or the profitability of these product revenues to us may be lower than if we were to market and sell products ourselves. In addition, we may not be successful in entering into arrangements with third parties to commercialize our product candidates or may be unable to do so on terms that are favorable to us. We may have little control over such third parties, and any of them may fail to devote the necessary resources and attention to sell and market our products effectively. If we do not establish commercialization capabilities successfully, either on our own or in collaboration with third parties, we will not be successful in commercializing our product candidates.

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We face significant competition in an environment of rapid technological change, and there is a possibility that our competitors may achieve regulatory approval before us or develop therapies that are safer or more advanced or effective than ours, which may harm our financial condition and our ability to successfully market or commercialize product candidates, if approved.

The development and commercialization of new drug and biologic products is highly competitive. Moreover, the genome engineering and oncology fields are characterized by rapidly changing technologies, significant competition and a strong emphasis on intellectual property. We will face competition with respect to our product candidates that we develop or commercialize in the future from major pharmaceutical companies, specialty pharmaceutical companies and biotechnology companies worldwide. Potential competitors also include academic institutions, government agencies and other public and private research organizations that conduct research, seek patent protection and establish collaborative arrangements for research, development, manufacturing and commercialization.

There are a number of large pharmaceutical and biotechnology companies that currently market and sell products or are pursuing the development of products for the treatment of the disease indications for which we have product candidates and research programs. Some of these competitive products and therapies are based on scientific approaches that are similar to our approach, and others are based on entirely different approaches.

Any product candidates that we successfully develop and commercialize will compete with existing therapies and new therapies that may become available in the future that are approved to treat the same diseases for which we may obtain approval for our product candidates. This may include other types of therapies, such as small molecule, antibody and/or protein therapies.

Many of our current or potential competitors, either alone or with their collaboration partners, may have significantly greater financial resources and expertise in research and development, manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals and marketing approved products than we do. Mergers and acquisitions in the pharmaceutical, biotechnology and gene therapy industries may result in even more resources being concentrated among a smaller number of our competitors. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. These competitors also compete with us in recruiting and retaining qualified scientific and management personnel and establishing clinical trial sites and patient registration for clinical trials, as well as in acquiring technologies complementary to, or necessary for, our programs. Our commercial opportunity could be reduced or eliminated if our competitors develop and commercialize product candidates that are safer, more effective, have fewer or less severe side effects, are more convenient or are less expensive than our product candidates or that would render our product candidates obsolete or non-competitive. Our competitors also may obtain FDA or other regulatory approval for their product candidates more rapidly than we may obtain approval for ours, which could result in our competitors establishing a strong market position before we are able to enter the market. Additionally, technologies developed by our competitors may render our product candidates uneconomical or obsolete, and we may not be successful in marketing any product candidates against competitors.

In addition, as a result of the expiration or successful challenge of our patent rights, we could face more litigation with respect to the validity and/or scope of patents relating to our competitors’ products. The availability of our competitors’ products could limit the demand, and the price we are able to charge, for our product candidates, if approved.

Adverse public perception of genetic medicines, and of genome engineering in particular, including as a result of other trials out of our control, such as the VCAR33AUTO trial currently sponsored by the NMDP, may negatively impact regulatory approval of, and/or demand for, our potential products.

Trem-cel, and future eHSCs and CAR-T or other cell-based targeted therapeutics we may develop, including product candidates that are evaluated in clinical trials out of our control, such as the VCAR33AUTO trial currently sponsored by the NMDP, will be, created by altering the human genome. The clinical and commercial success of our potential products will depend in part on public understanding and acceptance of the use of genome engineering for the prevention or treatment of human diseases. Public attitudes may be influenced by claims that genome

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engineering is unsafe, unethical or immoral, and, consequently, our current or future product candidates may not gain the acceptance of the public or the medical community. Adverse public attitudes may adversely impact the ability to enroll clinical trials for our current or future product candidates. Moreover, our success will depend upon physicians prescribing, and their patients being willing to receive, treatments that involve the use of product candidates in lieu of, or in addition to, existing treatments with which they are already familiar and for which greater clinical data may be available.

In addition, genome engineering technology is subject to public debate and heightened regulatory scrutiny due to ethical concerns relating to the application of genome engineering technology to human embryos or the human germline. For example, in the United States, germline alteration for clinical application has been expressly prohibited since enactment of a December 2015 FDA ban on such activity. Prohibitions are also in place in the United Kingdom, across most of Europe, in China and many other countries around the world. In the United States, the NIH has announced that the agency would not fund any use of gene engineering technologies in human embryos, noting that there are multiple existing legislative and regulatory prohibitions against such work, including the Dickey-Wicker Amendment, which prohibits the use of appropriated funds for the creation of human embryos for research purposes or for research in which human embryos are destroyed.

Although our product candidates do not involve technologies to alter human embryos or the human germline, public debate about the use of genome engineering technologies in human embryos and heightened regulatory scrutiny could prevent or delay the development of our product candidates. More restrictive government regulations or negative public opinion would have a negative effect on our business or financial condition and may delay or impair the development, commercialization and demand of our current or future product candidates. Adverse events in the preclinical studies or clinical trials for our current or future product candidates or those of our competitors or of academic researchers utilizing genome engineering technologies, even if not ultimately attributable to product candidates we may identify and develop, and the accompanying publicity could result in increased governmental regulation, unfavorable public perception, potential regulatory delays in the testing or approval of potential product candidates we may identify and develop, stricter labeling requirements for those product candidates that are approved and a decrease in demand for any such product candidates. Use of genome engineering technology by a third party or government to develop biological agents or products that threaten U.S. national security could similarly result in such negative impacts to us.

Due to the novel nature of our eHSCs, the small patient population we are addressing and the potential for any of our product candidates to offer benefits in a single administration or limited number of administrations, we face additional uncertainty related to pricing, coverage and reimbursement for these product candidates.

The pricing and reimbursement of our product candidates, if approved, must be adequate to support the necessary commercial infrastructure. If we are unable to obtain adequate levels of reimbursement, our ability to successfully market and sell any such product candidates will be adversely affected. The manner and level at which reimbursement is provided for services related to a product candidate (e.g., for administration of our product candidates to patients) is also important. Inadequate reimbursement for such services may lead to physician and payor resistance and adversely affect our ability to market or sell any product candidate we develop.

We are initially developing product candidates targeting rare diseases with small patient populations. For products that are designed to treat smaller patient populations to be commercially viable, the reimbursement for such products must be higher, on a relative basis, to account for the lack of volume. Accordingly, we will need to implement a coverage and reimbursement strategy for any approved product candidate with a smaller patient population that accounts for the smaller potential market size. Even if we obtain coverage for a given product by a third-party payor, the resulting reimbursement payment rates may not be adequate.

We are also initially developing products that are designed to be used in a single administration. We expect the cost of a single administration of genetic treatments, such as those we are seeking to develop, to be substantial, when and if they achieve regulatory approval. We expect that coverage and reimbursement by governmental healthcare programs such as Medicare and Medicaid, private health insurers and other third-party payors will be essential for most patients to be able to afford these treatments. Accordingly, sales of any such product candidates will depend substantially, both domestically and abroad, on the extent to which the costs of any such product candidates will be paid by governmental healthcare programs, private health plans and other third-party payors.

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Payors may not be willing to pay high prices for a single administration. Coverage and reimbursement by a third-party payor and physician utilization may depend upon several factors, including the third-party payor’s determination that use of a product is:

There is significant uncertainty related to third-party coverage and reimbursement of eHSCs. For example, effective for cost reporting periods beginning on or after October 1, 2020, under the Medicare Hospital Inpatient Prospective Payment Systems (“IPPS”), Medicare payment to the hospital for hematopoietic stem cell acquisition, including the preparation and processing of stem cells derived from peripheral blood, will be made on a reasonable cost basis. We believe that this new rule may also apply to eHSC products. Alternatively, we may apply for Medicare’s New Technology Add-on Payment (“NTAP”) designation for our eHSC product candidates, which, if approved, may allow for temporary reimbursement for new cell therapies above the standard Medicare Severity Diagnosis-Related Group payment amount under IPPS. NTAP will only be available for our product candidates, if approved, if we submit a timely and complete application and the Centers for Medicare & Medicaid Services (“CMS”) determines that our product candidates meet the eligibility requirements of NTAP, including, among other criteria, demonstrating a substantial clinical improvement relative to services or technologies previously available. We also believe that, for patients covered by commercial insurance, reimbursement will be based on a case rate methodology with possible provisions for separate payments for new therapies, such as eHSC. However, we cannot be certain that our eHSCs would qualify for these carveouts or other reimbursement avenues for new therapies. We also may not be able to provide data sufficient to gain acceptance with respect to coverage and reimbursement. If coverage and reimbursement are not available, or are available only at limited levels, we may not be able to successfully commercialize a product candidate. Even if coverage is provided, the approved reimbursement amount may not be adequate to realize a sufficient return on our investment. Further, even if favorable coverage and reimbursement status is attained for one or more product candidates for which we receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future. If we are unable to obtain adequate levels of reimbursement, our ability to successfully market and sell any product candidates will be harmed.

We may need to develop new reimbursement models to realize adequate value for our product candidates. Payors may not be able or willing to adopt such new models, and patients may be unable to afford that portion of the cost that such models may require them to bear. If we determine such new models are necessary but we are unsuccessful in developing them, or if such models are not adopted by payors, our business, financial condition, results of operations and prospects could be adversely affected.

Outside the United States, international operations are generally subject to extensive governmental price controls and other market regulations, and we believe the increasing emphasis on cost-containment initiatives in Europe and other countries has and will continue to put pressure on the pricing and usage of our products. In many countries, the prices of medical products are subject to varying price control mechanisms as part of national health systems. Other countries allow companies to fix their own prices for medical products but monitor and control company profits. Additional foreign price controls or other changes in pricing regulation could restrict the amount that we are able to charge for our products. Accordingly, in markets outside the United States, the reimbursement for our products may be reduced compared with the United States and may be insufficient to generate commercially reasonable revenue and profits.

Our inability to promptly obtain coverage and profitable payment rates from both government-funded and private payors for any approved products we may develop could have a material adverse effect on our operating results, our ability to raise capital needed to commercialize products and our overall financial condition.

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The market for our product candidates, if approved, may be limited to those patients who are ineligible for or have failed, or are at risk of failing, prior treatments and who are able to tolerate the side effects of co-administered or sequentially administered targeted therapies, and our projections regarding the size of the addressable market may be incorrect.

Cancer therapies are sometimes characterized as first line, second line or third line, and the FDA often approves new therapies initially only for last line use. When blood cancers are detected, they are treated with first line of therapy with the intention of curing the cancer. This generally consists of chemotherapy, radiation, antibody drugs, tumor-targeted small molecules or a combination of these. In addition, for myeloid malignancies, HSCT is frequently added to the first line therapy after the combination chemotherapy is given. If the patient’s cancer relapses, then they are given a second line or third line therapy, which can consist of more chemotherapy, radiation, antibody drugs, tumor-targeted small molecules or a combination of these, or HSCT. Generally, the higher the line of therapy, the lower the chance of a cure. If a patient relapses after HSCT, the goal of the therapy in the treatment of AML is to control the growth of the tumor and extend the life of the patient, as a cure is unlikely to happen.

We are initially developing trem-cel for use in patients receiving HSCT who have been determined to be at high-risk for relapse of AML in the anticipation that trem-cel would enhance the utility and broaden the applicability of therapies subsequently deployed. VCAR33ALLO or any other targeted therapeutic we may develop is not guaranteed approval as an earlier line therapy or in settings other than bridge to transplant. In addition, we may have to conduct additional large randomized clinical trials prior to or post gaining approval for use trem-cel in patients who have not experienced relapse and/or in combination with an earlier line of therapy or of VCAR33ALLO as or in combination with a different line of treatment.

Our projections of both the number of people who have the cancers we are targeting, as well as the size of the patient population subset who are in a position to undergo HSCT, who are likely to relapse and who have the potential to benefit from treatment with eHSCs, or who are in a position to benefit from a targeted therapeutic, such as VCAR33ALLO, are based on our estimates and data provided to us by third parties. These estimates have been derived from a variety of sources, including scientific literature, surveys of clinics, the NMDP, research facilities, patient foundations or market research and may prove to be incorrect. Further, new studies may change the estimated incidence or prevalence of these cancers. The number of patients may turn out to be fewer than expected.

Additionally, the potentially addressable patient population for our product candidates may be limited, or may not be amenable to treatment with our product candidates. The addressable patient population will ultimately depend upon, among other things, the diagnosis criteria included in the final label, the availability of alternative treatments and the safety, convenience, cost and efficacy of our product candidates relative to such alternative treatments, acceptance by the medical community and patient access, drug pricing and reimbursement.

Even if we obtain significant market share for our product candidates, because the potential target populations are small, we may never achieve significant revenue without obtaining regulatory approval for additional indications or in connection with earlier lines of therapy.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of our product candidates.

We face an inherent risk of product liability exposure related to the testing in human clinical trials of our product candidates and will face an even greater risk if we commercially sell any products that we may develop. For example, we may be sued if our product candidates cause, or are perceived to cause, injury or are found to be otherwise unsuitable during clinical trials, manufacturing, marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, a failure to warn of dangers inherent in the product, negligence, strict liability or a breach of warranties. Claims could also be asserted under state consumer protection acts. If we cannot successfully defend ourselves against claims that our product candidates or products caused injuries, we could incur substantial liabilities. Regardless of merit or eventual outcome, liability claims may result in:

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Insurance coverage is also increasingly expensive and we may not be able to maintain insurance coverage at a reasonable cost or in an amount adequate to satisfy any liability that may arise.

Cell and genetic medicines are novel, and our product candidates are complex and difficult to manufacture. We could experience delays in satisfying regulatory authorities or production problems that result in delays in our development or commercialization programs, limit the supply of our product candidates, or otherwise harm our business.

Our product candidates require processing steps that are more complex than those required for most chemical and other biological pharmaceuticals. Moreover, unlike chemical and other biological pharmaceuticals, the physical and chemical properties of a gene-engineered cell therapy, such as an eHSC or CAR-T or other cell-based targeted therapeutics we may develop, generally cannot be fully characterized. As a result, assays of the finished product candidate may not be sufficient to ensure that the product candidate will perform in the intended manner. Problems with the manufacturing process, even minor deviations from the normal process, could result in product defects or manufacturing failures that result in lot failures, product recalls, product liability claims, insufficient inventory or potentially delay progression of our potential IND filings or clinical trials. If we successfully develop product candidates, we may encounter problems achieving adequate quantities and quality of clinical-grade materials that meet FDA, EMA or other comparable applicable foreign standards or specifications with consistent and acceptable production yields and costs. In addition, our product candidates will require complicated delivery modalities, such as electroporation, which will introduce additional complexities in the manufacturing process. Any of the foregoing factors could limit our ability to replicate the vein-to-vein time achieved in our preclinical manufacturing of trem-cel in a clinical or, if approved, commercial setting.

Our product candidates consist, and any other eHSC or CAR-T or other cell-based targeted therapeutics we may develop will consist, of genetically engineered human cells, and the process of manufacturing such product candidates is complex, concentrated with a limited number of suppliers, highly regulated and subject to numerous risks. Manufacturing such product candidates involves harvesting cells from a donor or from the patient, altering the cells ex vivo using genome engineering technology, cryopreservation, storage and eventually shipment and infusing the cell product into the patient’s body. Our manufacturing process will be susceptible to product loss or failure, or product variation that may negatively impact patient outcomes, due to logistical issues associated with the collection of starting material from the donor, shipping such material to the manufacturing site, shipping the final product back to the clinical trial recipient, preparing the product for administration, infusing the patient with the product, manufacturing issues or different product characteristics resulting from the differences in donor starting materials, variations between reagent lots, interruptions in the manufacturing process, contamination, equipment or reagent failure, improper installation or operation of equipment, vendor or operator error, inconsistency in cell growth and variability in product characteristics. Our manufacturing process, like that of a number of other cell therapy companies, is also characterized by limited numbers of suppliers, and in some cases sole source suppliers, with the manufacturing capabilities and know-how to create or source the materials, such as donor marrow cells and electroporation machines, used in our cell manufacturing. While we pursue multiple sources for the critical components of our manufacturing process, we may not be successful in securing these additional sources at all or on a timely basis. Even minor deviations from normal manufacturing processes could result in reduced production yields, product defects and other supply disruptions. If microbial, viral or other contaminations are discovered in our product candidates or in any of the manufacturing facilities in which products or other materials are made, such manufacturing facilities may need to be closed for an extended period of time to investigate and remedy the contamination. In addition, because trem-cel and VCAR33ALLO are manufactured for each particular patient, we will be required to maintain a chain of identity with respect to materials as they move from the donor or patient to the

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manufacturing facility, through the manufacturing process and back to the clinical trial recipient. Maintaining a chain of identity is difficult and complex, and failure to do so could result in adverse patient outcomes, loss of product or regulatory action, including withdrawal of our products from the market. Any failure in the foregoing processes could render a batch of product unusable, could affect the regulatory approval of such product candidate, could cause us to incur fines or penalties or could harm our reputation and that of our product candidates.

We may make changes to our manufacturing process, including with respect to our in-house manufacturing capabilities, for various reasons, such as to control costs, achieve scale, decrease processing time, increase manufacturing success rate or for other reasons. Changes to our process made during the course of clinical development could require us to show the comparability of the product used in earlier clinical phases or at earlier portions of a trial to the product used in later clinical phases or later portions of the trial. Other changes to our manufacturing process made before or after commercialization could require us to show the comparability of the resulting product to the product candidate used in the clinical trials using earlier processes. Such showings could require us to collect additional nonclinical or clinical data from any modified process prior to obtaining marketing approval for the product candidate produced with such modified process. If such data are not ultimately comparable to that seen in the earlier trials or earlier in the same trial in terms of safety or efficacy, we may be required to make further changes to our process and/or undertake additional clinical testing, either of which could significantly delay the clinical development or commercialization of the associated product candidate, which would materially adversely affect our business, financial condition, results of operations and growth prospects

In addition, the FDA, the EMA and other regulatory authorities may require us to submit samples of any lot of any approved product together with the protocols showing the results of applicable tests at any time. Under some circumstances, the FDA, the EMA or other regulatory authorities may require that we not distribute a lot until the agency authorizes its release. Slight deviations in the manufacturing process, including those affecting quality attributes and stability, may result in unacceptable changes in the product that could result in lot failures or product recalls. Lot failures or product recalls could cause us to delay clinical trials or product launches, which could be costly to us and otherwise harm our business, financial condition, results of operations and prospects.

We also may encounter problems hiring and retaining the experienced scientific, quality control and manufacturing personnel needed to manage our manufacturing process, which could result in delays in our production or difficulties in maintaining compliance with applicable regulatory requirements.

Given the nature of biologics manufacturing, there is a risk of contamination during manufacturing. Any contamination could materially harm our ability to produce product candidates on schedule and could harm our results of operations and cause reputational damage. Some of the raw materials that we anticipate will be required in our manufacturing process are derived from biologic sources. Such raw materials are difficult to procure and may be subject to contamination or recall. A material shortage, contamination, recall or restriction on the use of biologically derived substances in the manufacture of trem-cel could adversely impact or disrupt the commercial manufacturing or the production of clinical material, which could materially harm our development timelines and our business, financial condition, results of operations and prospects. Also, due to the short time between the collection of donor HSCs, the manufacturing of trem-cel and the shipment to a transplant center for use in HSCT, there are limited opportunities for sterility testing and we anticipate that final testing may occur just before or after the administration trem-cel. Any delays in testing may delay administration of trem-cel and any administration prior to testing may result in positive bacterial tests and obligations to notify health authorities.

Any problems in our manufacturing process, including at either our in-house manufacturing facility or the facilities with which we contract could make us a less attractive collaborator for potential partners, including larger pharmaceutical companies and academic research institutions, which could limit our access to additional attractive development programs. Problems in internal or third-party manufacturing process or facilities, including our own facility that we are building, also could restrict our ability to ensure sufficient clinical material for any clinical trials we may be conducting or are planning to conduct and meet market demand for any product candidates we develop and commercialize.

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The process for treating cancer patients using T cell therapy or other cell-based targeted therapies is subject to human and systemic risks.

The “vein-to-vein” cycle for treating cancer patients using T cell therapy or other cell-based targeted therapies typically takes approximately four to six weeks and involves a large number of steps and human participants. First, the patient’s lymphocytes are isolated by apheresis at the clinical site and shipped to the manufacturing site. Under cGMP conditions at the manufacturing site, the patient’s lymphocytes are thawed and washed and then enriched for CD33-positive T cells using specialized reagents. After overnight culture and T cell activation, the T cells are transduced using lentiviral vector transduction technology to introduce the CAR genetic construct into the enriched T cell population. At the completion of T cell transduction, the T cells are harvested, formulated into the final drug product and then cryopreserved for delivery to patients. Similar procedures may be used for other cell-based targeted therapies, such as a CAR natural killer cell therapy. In the United States, samples of the final product are subjected to several release tests which must fulfill specified criteria for the drug product to be released for infusion. These include sterility, identity, purity, potency and other tests. We are subject to stringent regulatory and quality standards for the T cell therapy treatment process. We cannot offer assurances that our quality control and assurance efforts will be successful or that the risk of human or systemic errors in these processes can be eliminated.

Prior treatments can alter the cancer and negatively impact chances for achieving clinical activity with our CAR-T or other cell-based targeted therapies.

Patients with hematological cancers typically receive highly toxic chemotherapy as their initial treatments that can impact the viability of the T cells collected from the patient and may contribute to highly variable responses to CAR-T or other cell-based targeted therapies. In certain instances, we may use the allogeneic derived T cell fraction from the leukapheresis of the HLA-matched normal healthy donors as the starting material. Like the patient derived T cells, these donor-derived T cells may also display variability that will impact responses to VCAR33ALLO or other cell-based targeted therapeutics we may develop. Patients could also have received prior therapies that target the same molecule on the cancer cells as cell-based targeted therapeutics we may develop and thereby these patients may have cancer cells with low or no expression of the target. As a result, VCAR33ALLO or any other cell-based targeted therapeutics we may develop may not recognize the cancer cell and may fail to achieve clinical activity. For example, AML patients could have received a BCMA-targeting antibody drug conjugate BCMA-ADC like GSK2857916, BCMA targeting T cell engagers like AMG-420 (Amgen) and CC-93269 (Bristol-Myers Squibb), or similar products or product candidates prior to receiving VCAR33 or any other cell-based targeted therapeutics we may develop. If any product candidates we develop do not achieve a sufficient level of clinical activity, we may discontinue the development of that product candidate, which could have an adverse effect on the value of our common stock.

We and any third-party manufacturers and any third-party collaborators may be unable to successfully scale-up manufacturing of our product candidates in sufficient quality and quantity, which would delay or prevent us from developing such product candidates and commercializing approved products, if any.

Although we have initiated internal GMP manufacturing capabilities to produce supplies of our cell-based therapies for our clinical trials and are currently producing supplies to support the IND for VCAR33ALLO, in order to conduct clinical trials of our product candidates, we may need to work with third-party manufacturers to manufacture them in sufficient quantities if we are not able to produce sufficient quantities on our own. We, or our manufacturing partners or our third-party collaborators, may be unable to successfully increase the manufacturing capacity of our product candidates in a timely or cost-effective manner, or at all. We expect that each lot of trem-cel and VCAR33ALLO will need to be manufactured for a specific individual patient, and each lot will need to be individually tested and released for that patient. As a result, we may experience limited production capacity and be unable to meet the need of all patients who could benefit from treatment, if approved. In addition, quality issues may arise during scale-up activities. If we or our manufacturing partners or collaborators are unable to successfully scale up the manufacture of our current or future product candidates in sufficient quality and quantity, the development, testing and clinical trials of that product candidate may be delayed or infeasible, and marketing approval or commercial launch of any resulting product may be delayed or not obtained, which could significantly harm our business.

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We have not yet developed a validated methodology for freezing and thawing large quantities of eHSCs or of VCAR33, which we believe will be required for the storage and distribution of our product candidates.

We have not demonstrated that eHSCs or VCAR33, when manufactured for late stage clinical studies or at a commercial scale, can be frozen and thawed without damage in a cost-efficient manner and without degradation. We may encounter difficulties not only in developing freezing and thawing methodologies, but also in obtaining the necessary regulatory approvals for using such methodologies in treatment. If we cannot adequately demonstrate similarity of our frozen product to the unfrozen form to the satisfaction of the FDA, we could face substantial delays in our regulatory approvals. If we are unable to freeze eHSCs or VCAR33 or other cell-based targeted therapeutics we may develop for shipping purposes, our ability to promote adoption and standardization of our products, as well as achieve economies of scale by centralizing production facilities, will be limited. Even if we are able to successfully freeze and thaw eHSCs or VCAR33 at commercial scale, we will still need to develop a cost-effective and reliable distribution and logistics network, which we may be unable to accomplish. For these and other reasons, we may not be able to manufacture eHSCs, VCAR33 or other cell-based targeted therapeutics we may develop at commercial scale or in a cost-effective manner.

If we or any contract manufacturers and suppliers that we engage fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs that could have a material adverse effect on the success of our business.

We and any contract manufacturers and suppliers we engage are subject to numerous federal, state and local environmental, health and safety laws, regulations and permitting requirements, including those governing laboratory procedures; the generation, handling, use, storage, treatment and disposal of hazardous and regulated materials and wastes; the emission and discharge of hazardous materials into the ground, air and water; and employee health and safety. Our operations involve the use of hazardous and flammable materials, including chemicals and biological and radioactive materials. Our operations also produce hazardous waste. We generally contract with third parties for the disposal of these materials and wastes. We cannot eliminate the risk of contamination or injury from these materials. In the event of contamination or injury resulting from our use of hazardous materials, we could be held liable for any resulting damages, and any liability could exceed our resources. Under certain environmental laws, we could be held responsible for costs relating to any contamination at our current or past facilities and at third-party facilities. We also could incur significant costs associated with civil or criminal fines and penalties.

Compliance with applicable environmental laws and regulations may be expensive, and current or future environmental laws and regulations may impair our product development and research efforts. In addition, we cannot eliminate the risk of accidental injury or contamination from these materials or wastes. Although we maintain workers’ compensation insurance to cover us for costs and expenses, we may incur due to injuries to our employees resulting from the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities. We do not carry specific biological or hazardous waste insurance coverage, and our property, casualty and general liability insurance policies specifically exclude coverage for damages and fines arising from biological or hazardous waste exposure or contamination. Accordingly, in the event of contamination or injury, we could be held liable for damages or be penalized with fines in an amount exceeding our resources, and our clinical trials or regulatory approvals could be suspended, which could have a material adverse effect on our business, financial condition, results of operations and prospects.

In addition, we may incur substantial costs to comply with current or future environmental, health and safety laws, regulations and permitting requirements. For example, our products are considered to contain genetically modified organisms or cells, which are regulated in different ways depending upon the country in which preclinical research or clinical trials are conducted. These current or future laws, regulations and permitting requirements may impair our research, development or production efforts. Failure to comply with these laws, regulations and permitting requirements also may result in substantial fines, penalties or other sanctions or business disruption, which could have a material adverse effect on our business, financial condition, results of operations and prospects.

Any third-party contract manufacturers and suppliers we engage will also be subject to these and other environmental, health and safety laws and regulations. Liabilities they incur pursuant to these laws and regulations

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could result in significant costs or an interruption in operations, which could have a material adverse effect on our business, financial condition, results of operations and prospects.

Success in preclinical studies or clinical trials may not be indicative of results in future clinical trials, particularly for our clinical trials that involve only a small number of patients.

Results from preclinical studies are not necessarily predictive of future clinical trial results, and interim results of a clinical trial are not necessarily indicative of final results. Our clinical trials may involve a small number of patients, which makes it difficult to predict whether early results from these trials will be indicative of the final results of the trials or be replicated in future trials. For example, we are actively recruiting for VBP101, our Phase 1/2a multicenter, open-label, first-in-human trial of trem-cel in combination with Mylotarg in patients with AML, and we released initial clinical data in December 2022 and February 2023 based on two patients. Although we believe the initial clinical data could provide important validating evidence of the potential of trem-cel and our broader eHSC approach, the final results of this trial may not be consistent with our interim results. For that reason, we do not know whether these candidates will be effective for the intended indications or safe in humans. Our product candidates may fail to show the desired safety and efficacy in clinical development despite positive results in preclinical studies or having successfully advanced through initial clinical trials. This failure to establish sufficient efficacy and safety could cause us to abandon clinical development of our product candidates.

Risks Related to Regulatory Review

If clinical trials of any of our product candidates fail to demonstrate safety and efficacy to the satisfaction of regulatory authorities or do not otherwise produce positive results, we may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and commercialization of such product candidates.

Before obtaining marketing approval from regulatory authorities for the sale of our product candidates, we must complete preclinical development and then conduct extensive clinical trials to demonstrate the safety and efficacy in humans. Clinical testing is expensive, difficult to design and implement, can take many years to complete and is uncertain as to outcome. A failure of one or more clinical trials can occur at any stage of testing. The outcome of preclinical testing and early clinical trials may not be predictive of the success of later clinical trials, and interim results of a clinical trial do not necessarily predict final results.

Moreover, preclinical and clinical data are often susceptible to varying interpretations and analyses. Many companies that have believed their product candidates performed satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain marketing approval of their product candidates.

We and our collaborators, if any, may experience numerous unforeseen events during, or as a result of, clinical trials that could delay or prevent our ability to receive marketing approval or commercialize any product candidates, including:

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If we or our collaborators are required to conduct additional clinical trials or other testing of product candidates beyond those that we currently contemplate, if we or our collaborators are unable to successfully complete clinical trials or other testing of product candidates, or if the results of these trials or tests are not positive or are only modestly positive or if there are safety concerns, we or our collaborators may:

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Product development costs will also increase if we or our collaborators experience delays in clinical trials or other testing or in obtaining marketing approvals. We do not know whether any clinical trials will begin as planned, will need to be restructured or will be completed on schedule, or at all. Significant clinical trial delays also could shorten any periods during which we may have the exclusive right to commercialize product candidates, could allow our competitors to bring products to market before we do and could impair our ability to successfully commercialize product candidates, any of which may harm our business, financial condition, results of operations and prospects.

Even if we complete the necessary clinical trials, we cannot predict when, or if, we will obtain regulatory approval to commercialize trem-cel, VCAR33, the trem-cel + VCAR33 Treatment System or any other product candidate we may develop in the United States or any other jurisdiction, and any such approval may be for a more narrow indication than we seek.

We cannot commercialize a product candidate until the appropriate regulatory authorities have reviewed and approved the product candidate. Even if our product candidates meet their safety and efficacy endpoints in clinical trials, the regulatory authorities may not complete their review processes in a timely manner, or we may not be able to obtain regulatory approval. Additional delays may result if an FDA Advisory Committee or other regulatory authority recommends non-approval or restrictions on approval. In addition, we may experience delays or rejections based upon additional government regulation from future legislation or administrative action, or changes in regulatory authority policy during the period of product development, clinical trials and the review process.

Regulatory authorities also may approve a product candidate for more limited indications than requested or they may impose significant limitations in the form of narrow indications, warnings or a REMS. These regulatory authorities may require labeling that includes precautions or contra-indications with respect to conditions of use, or they may grant approval subject to the performance of costly post-marketing clinical trials. In addition, regulatory authorities may not approve the labeling claims that are necessary or desirable for the successful commercialization of our product candidates. Any of the foregoing scenarios could materially harm the commercial prospects for our product candidates and materially adversely affect our business, financial condition, results of operations and prospects.

Marketing approval by the FDA in the United States, if obtained, does not ensure approval by regulatory authorities in other countries or jurisdictions. In addition, clinical trials conducted in one country may not be accepted by regulatory authorities in other countries, and regulatory approval in one country does not guarantee regulatory approval in any other country. Approval processes vary among countries and can involve additional product candidate testing and validation and additional administrative review periods. Seeking foreign regulatory approval could result in difficulties and costs for us and require additional preclinical studies or clinical trials which could be costly and time-consuming. Regulatory requirements can vary widely from country to country and could delay or prevent the introduction of our product candidates in those countries. The foreign regulatory approval process involves all of the risks associated with FDA approval. We do not have any product candidates approved for sale in any jurisdiction, including international markets, and we do not have experience in obtaining regulatory approval in international markets. If we fail to comply with regulatory requirements in international markets or to obtain and maintain required approvals, or if regulatory approvals in international markets are delayed, our target market will be reduced and our ability to realize the full market potential of our product candidates will be unrealized.

Genome engineering technology is subject to a number of challenges and risks. Because genome engineering technology is novel and the regulatory landscape that will govern our product candidates is uncertain and may change, we cannot predict the time and cost of obtaining regulatory approval, if we receive it at all, for our product candidates.

Because our product candidates and technology platform involve genome engineering, we are subject to many of the challenges and risks that other genetically engineered biologics and gene therapies face, including: