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Linvoseltamab Pivotal Data Presented at AACR Reinforce High Response Rate that Deepens Over Time in Patients with Heavily Pre-Treated Multiple Myeloma

TARRYTOWN, N.Y., April 07, 2024 (GLOBE NEWSWIRE) -- Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) today announced the oral plenary session presentation of positive pivotal data from the Phase 1/2 LINKER-MM1 trial of linvoseltamab in patients with relapsed/refractory (R/R) multiple myeloma (MM) at the American Association for Cancer Research (AACR) Annual Meeting 2024 in San Diego. Linvoseltamab is an investigational bispecific antibody designed to bridge B-cell maturation antigen (BCMA) on multiple myeloma cells with CD3-expressing T cells to facilitate T-cell activation and cancer-cell killing.

“The presentation of these pivotal results in an oral plenary session at AACR recognizes the exciting potential of linvoseltamab to advance the treatment of multiple myeloma,” said Sundar Jagannath, M.D., Director of the Multiple Myeloma Center of Excellence at Tisch Cancer Center at Mount Sinai in New York City and a trial investigator. “In clinical trials, linvoseltamab treatment led to responses that occurred early, were durable and deepened over time – all critical efficacy measures for this heavily pre-treated patient population. Further, among patients who had at least 24 weeks of treatment, the majority achieved a very good partial response, enabling them to transition from every two-week to every four-week dosing. This is an important accomplishment that I’ve seen firsthand in my trial patients, and I eagerly anticipate the FDA decision expected this August.”

With an 11-month median duration of follow up, the linvoseltamab data among 117 patients presented at AACR reinforce the strength of previously shared findings and included a:

  • 71% objective response rate (ORR), with 46% of patients achieving a complete response (CR) or better and 62% achieving a very good partial response (VGPR) or better, as determined by an independent review committee.
  • 1-month median time to response (range: <1-6 months). In responders, the median time to a VGPR or better was 3 months (range: <1-13 months) and to a CR or better was 8 months (range: 2-14 months).
  • Median duration of response (DoR), median progression-free survival (PFS) and median overall survival (OS) were not reached. At 12 months, the estimated probability of maintaining a response was 78%, being progression free was 69% and survival was 75%.
  • Among patients who had a CR or better and were minimum residual disease (MRD) evaluable, 93% (25 of 27 patients) were MRD negative at 10-5.

The trial included a response-adapted regimen that enabled linvoseltamab patients to shift to every four-week dosing if they achieved a VGPR or better and completed at least 24 weeks of therapy. In the dose expansion portion of the trial (n=105), of the patients who had at least 24 weeks of therapy at data cutoff, 90% (56 of 62) achieved a VGPR or better and were able to transition to every four-week dosing. Of the 29 patients who transitioned to the extended dosing regimen prior to achieving a CR, 48% (14 of 29) subsequently experienced a deepening of response to CR or better.

In addition, high ORRs were observed across prespecified subgroups – including high-risk and high-disease burden populations – as follows:

  • 85% among Black or African American patients (17 of 20 patients)
  • 71% among those aged 75 years or older (22 of 31 patients)
  • 67% among those with high cytogenetic risk (31 of 46 patients)
  • 62% among those with International Staging System stage III disease (13 of 21 patients)
  • 53% among those with extramedullary plasmacytomas (10 of 19 patients)

Cytokine release syndrome (CRS) was the most commonly occurring treatment-emergent adverse event (TEAE) and was observed in 46% of patients; 35% were Grade 1, 10% were Grade 2 and one case (1%) was Grade 3. Adjudicated immune effector cell-associated neurotoxicity syndrome (ICANS) events of any grade occurred in 8% of patients, including three cases that were Grade 3 and no cases that were ≥Grade 4. Infections occurred in 73% of patients, with their frequency and severity decreasing after 6 months; 34% were Grade 3 or 4. The most common Grade 3 or 4 TEAEs (≥20%) were neutropenia (40%) and anemia (31%). Six deaths occurred on treatment or within 30 days of the last treatment dose due to TEAEs; five were due to infection, and one was due to renal failure.

Linvoseltamab has been granted Fast Track Designation and was accepted for Priority Review for the treatment of R/R MM by the FDA, with a target action date of August 22, 2024. In addition, linvoseltamab is being reviewed by the EMA. Linvoseltamab is currently under clinical development, and its safety and efficacy have not been fully evaluated by any regulatory authority.

The Phase 3 confirmatory trial for linvoseltamab in patients with R/R MM (LINKER-MM3) is underway.

About Multiple Myeloma
As the second most common blood cancer, there are over 176,000 new cases of MM diagnosed globally, and 35,000 cases are diagnosed in the U.S. every year. In the U.S., there are approximately 8,000 people who have MM that has progressed after three lines of therapy, and 4,000 whose disease has progressed after four or more therapies. The disease is characterized by the proliferation of cancerous plasma cells (MM cells) that crowd out healthy blood cells in the bone marrow, infiltrate other tissues and cause potentially life-threatening organ injury. Despite treatment advances, MM is not curable and while current treatments are able to slow progression of the cancer, most patients will ultimately experience cancer progression and require additional therapies.

About the Linvoseltamab Phase 1/2 Trial and Clinical Development Program
The ongoing, open-label, multicenter Phase 1/2 dose-escalation and dose-expansion LINKER-MM1 trial is investigating linvoseltamab in 282 enrolled patients with relapsed/refractory MM. The Phase 1 dose-escalation portion of the trial – which is now complete – primarily assessed safety, tolerability and dose-limiting toxicities across nine dose levels of linvoseltamab and explored different administration regimens. The ongoing Phase 2 dose expansion portion is assessing the safety and anti-tumor activity of linvoseltamab, with the primary endpoint of ORR. Key secondary endpoints include DoR, PFS, rate of MRD negative status and OS.

Eligibility in the Phase 2 portion requires patients to have received at least three prior lines of therapy or have triple-class refractory MM. Linvoseltamab is administered with an initial step-up dosing regimen followed by the full 200 mg dose administered weekly. At week 16, all patients transition to every two-week dosing. A response-adapted regimen further enables patients to shift to every four-week dosing if they achieve a VGPR or better and have completed at least 24 weeks of therapy. The regimen requires a total of two 24-hour hospitalizations for safety monitoring.

The broader linvoseltamab clinical development program includes additional trials in earlier lines of therapy and stages of disease that are planned or underway. They include a Phase 1/2 trial in first-line MM, a Phase 2 trial in high-risk smoldering MM, and a Phase 2 trial in monoclonal gammopathy of undetermined significance. A Phase 1 trial of linvoseltamab in combination with a Regeneron CD38xCD28 costimulatory bispecific in MM is also planned. For more information, visit the Regeneron clinical trials website, or contact via or 844-734-6643.

About Regeneron in Hematology
At Regeneron, we’re applying more than three decades of biology expertise with our proprietary VelociSuite® technologies to develop medicines for patients with diverse blood cancers and rare blood disorders.

Our blood cancer research is focused on bispecific antibodies that are being investigated both as monotherapies and in various combinations and emerging therapeutic modalities. Together, they provide us with unique combinatorial flexibility to develop customized and potentially synergistic cancer treatments.

Our research and collaborations to develop potential treatments for rare blood disorders include explorations in antibody medicine, gene editing and gene-knockout technologies, and investigational RNA-approaches focused on depleting abnormal proteins or blocking disease-causing cellular signaling.

About Regeneron
Regeneron is a leading biotechnology company that invents, develops and commercializes life-transforming medicines for people with serious diseases. Founded and led for over 35 years by physician-scientists, our unique ability to repeatedly and consistently translate science into medicine has led to numerous FDA-approved treatments and product candidates in development, almost all of which were homegrown in our laboratories. Our medicines and pipeline are designed to help patients with eye diseases, allergic and inflammatory diseases, cancer, cardiovascular and metabolic diseases, hematologic conditions, infectious diseases and rare diseases.

Regeneron is accelerating and improving the traditional drug development process through our proprietary VelociSuite technologies, such as VelocImmune®, which uses unique genetically humanized mice to produce optimized fully human antibodies and bispecific antibodies, and through ambitious research initiatives such as the Regeneron Genetics Center®, which is conducting one of the largest genetics sequencing efforts in the world.

For more information about Regeneron, please visit or follow Regeneron on LinkedIn.

Forward-Looking Statements and Use of Digital Media
This press release includes forward-looking statements that involve risks and uncertainties relating to future events and the future performance of Regeneron Pharmaceuticals, Inc. (“Regeneron” or the “Company”), and actual events or results may differ materially from these forward-looking statements. Words such as “anticipate,” “expect,” “intend,” “plan,” “believe,” “seek,” “estimate,” variations of such words, and similar expressions are intended to identify such forward-looking statements, although not all forward-looking statements contain these identifying words. These statements concern, and these risks and uncertainties include, among others, the nature, timing, and possible success and therapeutic applications of products marketed or otherwise commercialized by Regeneron and/or its collaborators or licensees (collectively, “Regeneron’s Products”) and product candidates being developed by Regeneron and/or its collaborators or licensees (collectively, “Regeneron’s Product Candidates”) and research and clinical programs now underway or planned, including without limitation linvoseltamab; the likelihood, timing, and scope of possible regulatory approval and commercial launch of Regeneron’s Product Candidates and new indications for Regeneron’s Products, such as any potential regulatory approval of linvoseltamab for the treatment of relapsed/refractory multiple myeloma (“R/R MM”) by the U.S. Food and Drug Administration (the “FDA”) (including the timing of enrollment of patients in the Phase 3 confirmatory trial for linvoseltamab in patients with R/R MM referenced in this press release (the “R/R MM Confirmatory Trial”), whether any beneficial regulatory designations previously granted by the FDA and referenced in this press release will positively impact the timing for potential FDA approval, and whether any such approval will be obtained by the FDA’s target action date referenced in this press release) or the European Medicines Agency; uncertainty of the utilization, market acceptance, and commercial success of Regeneron’s Products and Regeneron’s Product Candidates and the impact of studies (whether conducted by Regeneron or others and whether mandated or voluntary), including the studies discussed or referenced in this press release (such as the R/R MM Confirmatory Trial), on any of the foregoing or any potential regulatory approval of Regeneron's Products and Regeneron's Product Candidates (such as linvoseltamab); the ability of Regeneron’s collaborators, licensees, suppliers, or other third parties (as applicable) to perform manufacturing, filling, finishing, packaging, labeling, distribution, and other steps related to Regeneron’s Products and Regeneron’s Product Candidates; the ability of Regeneron to manage supply chains for multiple products and product candidates; safety issues resulting from the administration of Regeneron’s Products and Regeneron’s Product Candidates in patients, including serious complications or side effects in connection with the use of Regeneron’s Products and Regeneron’s Product Candidates in clinical trials; determinations by regulatory and administrative governmental authorities which may delay or restrict Regeneron’s ability to continue to develop or commercialize Regeneron’s Products and Regeneron’s Product Candidates; ongoing regulatory obligations and oversight impacting Regeneron’s Products, research and clinical programs, and business, including those relating to patient privacy; the availability and extent of reimbursement of Regeneron’s Products from third-party payers, including private payer healthcare and insurance programs, health maintenance organizations, pharmacy benefit management companies, and government programs such as Medicare and Medicaid; coverage and reimbursement determinations by such payers and new policies and procedures adopted by such payers; competing drugs and product candidates that may be superior to, or more cost effective than, Regeneron’s Products and Regeneron’s Product Candidates; the extent to which the results from the research and development programs conducted by Regeneron and/or its collaborators or licensees may be replicated in other studies and/or lead to advancement of product candidates to clinical trials, therapeutic applications, or regulatory approval; unanticipated expenses; the costs of developing, producing, and selling products; the ability of Regeneron to meet any of its financial projections or guidance and changes to the assumptions underlying those projections or guidance; the potential for any license, collaboration, or supply agreement, including Regeneron’s agreements with Sanofi and Bayer (or their respective affiliated companies, as applicable) to be cancelled or terminated; the impact of public health outbreaks, epidemics, or pandemics (such as the COVID-19 pandemic) on Regeneron's business; and risks associated with intellectual property of other parties and pending or future litigation relating thereto (including without limitation the patent litigation and other related proceedings relating to EYLEA® (aflibercept) Injection), other litigation and other proceedings and government investigations relating to the Company and/or its operations, the ultimate outcome of any such proceedings and investigations, and the impact any of the foregoing may have on Regeneron’s business, prospects, operating results, and financial condition. A more complete description of these and other material risks can be found in Regeneron’s filings with the U.S. Securities and Exchange Commission, including its Form 10-K for the year ended December 31, 2023. Any forward-looking statements are made based on management’s current beliefs and judgment, and the reader is cautioned not to rely on any forward-looking statements made by Regeneron. Regeneron does not undertake any obligation to update (publicly or otherwise) any forward-looking statement, including without limitation any financial projection or guidance, whether as a result of new information, future events, or otherwise.

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