PRINCETON - Bristol Myers Squibb (NYSE: BMY) and 2seventy bio, Inc. (Nasdaq: TSVT) today announced the U.S. Food and Drug Administration's (FDA) Oncologic Drugs Advisory Committee (ODAC) will meet to review data supporting the supplemental Biologics License Application (sBLA) for Abecma for earlier lines of triple-class exposed relapsed or refractory multiple myeloma (RRMM) based on results from the pivotal Phase 3 KarMMa-3 study.

The date of the ODAC meeting has not yet been confirmed by the FDA. The FDA also informed the companies that a decision on the application will not be made by the Prescription Drug User Fee Act (PDUFA) target action date of December 16, 2023.

The companies anticipate that the committee will review data related to the secondary endpoint of overall survival (OS). The companies look forward to continuing discussions with the FDA and participating in the ODAC meeting to reinforce the potential of Abecma to deliver significantly improved outcomes in patients with triple-class exposed RRMM in earlier lines of treatment. The ODAC meeting has no impact on the currently approved indication for Abecma for adult patients with triple-class exposed RRMM after four or more prior lines of therapy.

The KarMMa-3 study met its primary endpoint, demonstrating a statistically significant improvement in progression-free survival (PFS) compared to standard regimens, significantly reducing the risk of disease progression or death versus standard regimens in patients with triple-class exposed RRMM. Safety results were consistent with the well-established and generally predictable safety profile of Abecma. Final PFS data and interim OS data from the KarMMa-3 study will be presented on December 11 at the 2023 American Society of Hematology (ASH) Annual Meeting and Exposition.

Regulatory applications for Abecma in earlier lines of therapy for triple-class exposed RRMM based on the KarMMa-3 study results are also currently under review by Japan's Ministry of Health, Labour and Welfare, European Medicines Agency and Swissmedic.

About KarMMa-3

KarMMa-3 (NCT03651128) is a pivotal, Phase 3, open-label, global, randomized, controlled trial evaluating Abecma compared to standard regimens in patients with relapsed and refractory multiple myeloma who have received two to four prior lines of treatment, including an immunomodulatory agent, a proteasome inhibitor, and an anti-CD38 monoclonal antibody, and were refractory to the last treatment regimen. Patients were randomized to receive Abecma or standard regimens that consisted of combinations that included daratumumab, pomalidomide, and dexamethasone (DPd), daratumumab, bortezomib, and dexamethasone (DVd), ixazomib, lenalidomide, and dexamethasone (IRd), carfilzomib and dexamethasone (Kd) or elotuzumab, pomalidomide and dexamethasone (EPd) chosen based on their most recent treatment regimen and investigator discretion. The primary endpoint evaluated in this study is progression-free survival, defined as time from randomization to the first documentation of progressive disease or death due to any cause, whichever occurs first. Key secondary endpoints include overall response rate and overall survival.

About Abecma

Abecma is a CAR T cell therapy that recognizes and binds to BCMA on the surface of multiple myeloma cells leading to CAR T cell proliferation, cytokine secretion, and subsequent cytolytic killing of BCMA-expressing cells. Abecma is being jointly developed and commercialized in the U.S. as part of a Co-Development, Co-Promotion, and Profit Share Agreement between Bristol Myers Squibb and 2seventy bio.

The companies' broad clinical development program for Abecma includes ongoing clinical studies (KarMMa-2, KarMMa-3, KarMMa-9) in early lines of treatment for patients with multiple myeloma.

Bristol Myers Squibb: Creating a Better Future for People with Cancer

Bristol Myers Squibb is inspired by a single vision - transforming patients' lives through science. The goal of the company's cancer research is to deliver medicines that offer each patient a better, healthier life and to make cure a possibility. Building on a legacy across a broad range of cancers that have changed survival expectations for many, Bristol Myers Squibb researchers are exploring new frontiers in personalized medicine and, through innovative digital platforms, are turning data into insights that sharpen their focus. Deep understanding of causal human biology, cutting-edge capabilities and differentiated research platforms uniquely position the company to approach cancer from every angle.

Cancer can have a relentless grasp on many parts of a patient's life, and Bristol Myers Squibb is committed to taking actions to address all aspects of care, from diagnosis to survivorship. As a leader in cancer care, Bristol Myers Squibb is working to empower all people with cancer to have a better future.

About Bristol Myers Squibb

Bristol Myers Squibb is a global biopharmaceutical company whose mission is to discover, develop and deliver innovative medicines that help patients prevail over serious diseases.

About 2seventy bio

Our name, 2seventy bio, reflects why we do what we do - TIME. Cancer rips time away, and our goal is to work at the maximum speed of translating human thought into action - 270 miles per hour - to give the people we serve more time. We are building the leading immuno-oncology cell therapy company, focused on discovering and developing new therapies that truly disrupt the cancer treatment landscape. With a deep understanding of the human body's immune response to tumor cells and how to translate cell therapies into practice, we're applying this knowledge to deliver next generation cellular therapies that focus on a broad range of hematologic malignancies, including the first FDA-approved CAR T cell therapy for multiple myeloma, as well as solid tumors. Our research and development are focused on delivering therapies that are designed with the goal to 'think' smarter and faster than the disease. Importantly, we remain focused on accomplishing these goals by staying genuine and authentic to our 'why' and keeping our people and culture top of mind every day.

Bristol Myers Squibb Cautionary Statement Regarding Forward-Looking Statements

This press release contains 'forward-looking statements' within the meaning of the Private Securities Litigation Reform Act of 1995 regarding, among other things, the research, development and commercialization of pharmaceutical products. All statements that are not statements of historical facts are, or may be deemed to be, forward-looking statements. Such forward-looking statements are based on current expectations and projections about our future financial results, goals, plans and objectives and involve inherent risks, assumptions and uncertainties, including internal or external factors that could delay, divert or change any of them in the next several years, that are difficult to predict, may be beyond our control and could cause our future financial results, goals, plans and objectives to differ materially from those expressed in, or implied by, the statements. These risks, assumptions, uncertainties and other factors include, among others, that future study results may not be consistent with the results to date, that Abecma (idecabtagene vicleucel) may not receive regulatory approval for the additional indication described in this release in the currently anticipated timeline or at all, that any marketing approvals, if granted, may have significant limitations on their use, and, if approved, whether such product candidate for such additional indication described in this release will be commercially successful . No forward-looking statement can be guaranteed. It should also be noted that acceptance of the sBLA does not change the standards for FDA approval, that validation by the EMA of the application does not change the standards for EMA approval, and that acceptance of the sNDA does not change the standards for Japan's Ministry of Health, Labour and Welfare approval. Forward-looking statements in this press release should be evaluated together with the many risks and uncertainties that affect Bristol Myers Squibb's business and market, particularly those identified in the cautionary statement and risk factors discussion in Bristol Myers Squibb's Annual Report on Form 10-K for the year ended December 31, 2022, as updated by our subsequent Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and other filings with the Securities and Exchange Commission. The forward-looking statements included in this document are made only as of the date of this document and except as otherwise required by applicable law, Bristol Myers Squibb undertakes no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events, changed circumstances or otherwise.

2seventy bio Cautionary Note Regarding Forward-Looking Statements

This press release contains 'forward-looking statements' within the meaning of the Private Securities Litigation Reform Act of 1995 regarding, among other things, the research, development and commercialization of Abecma (idecabtagene vicleucel). All statements that are not statements of historical facts are, or may be deemed to be, forward-looking statements. Such forward-looking statements are based on historical performance and current expectations and projections about our future financial results, goals, plans and objectives and involve inherent risks, assumptions and uncertainties, including internal or external factors that could delay, divert or change any of them in the next several years, that are difficult to predict, may be beyond our control and could cause our future financial results, goals, plans and objectives to differ materially from those expressed in, or implied by, the statements. These risks, assumptions, uncertainties and other factors include, among others, the possibility that Abecma may not receive FDA approval for the indication described in this release in the currently anticipated timeline or at all, that any marketing approvals, if granted, may have significant limitations on their use, that Abecma may not be commercially successful and that collaboration with Bristol Myers Squibb may not continue or be successful. No forward-looking statement can be guaranteed. Forward-looking statements in this press release should be evaluated together with the many risks and uncertainties that affect 2seventy bio's business, particularly those identified in the risk factors discussion in 2seventy bio's Annual Report on Form 10-K, as updated by our subsequent Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and other filings with the Securities and Exchange Commission. The forward-looking statements included in this document are made only as of the date of this document and except as otherwise required by applicable law, 2seventy bio undertakes no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events, changed circumstances or otherwise.

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Contact:

Email: media@bms.com

Jenn Snyder

Tel: 617-448-0281

Email: jenn.snyder@2seventybio.com

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