Pivotal Odronextamab (CD20xCD3) Phase 2 Data in Patients with Relapsed/Refractory Diffuse Large B-cell Lymphoma Debut at ASH

49% objective response rate (ORR) in heavily pre-treated patients who were naïve to prior CAR-T, with 31% achieving a complete response (CR)

Even in patients who received prior CAR-T, 48% ORR and 32% CR observed in a dose expansion cohort from a Phase 1 trial

Data will form the basis of regulatory submissions planned for 2023

TARRYTOWN, N.Y., Dec. 11, 2022 /PRNewswire/ -- Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) today announced positive new and updated data from a Phase 1 and pivotal Phase 2 trial (ELM-1 and ELM-2) evaluating investigational odronextamab in patients with relapsed/refractory (R/R) diffuse large B-cell lymphoma (DLBCL). These included first data from a Phase 2 cohort of patients naïve to prior CAR-T therapy (CAR-T naïve), as well as updated data from a dose expansion cohort of a Phase 1 trial in patients who had progressed on CAR-T therapy (post-CAR-T). The results were presented in an oral session at the 64th American Society of Hematology (ASH) Annual Meeting and Exposition in New Orleans, LA, and will form the basis of planned submissions to regulatory authorities in 2023, including to the U.S. Food and Drug Administration (FDA). Odronextamab is an investigational bispecific antibody designed to bridge CD20 on cancer cells with CD3-expressing T cells to facilitate local T-cell activation and cancer-cell killing.

"People with diffuse large B-cell lymphoma face a disease that often relapses and becomes more aggressive each time it returns, leaving doctors with a shrinking set of treatment options," said Won Seog Kim, M.D., Ph.D., Samsung Medical Center and Division of Hematology-Oncology at Sungkyunkwan University, in Seoul, South Korea, and trial investigator. "The Phase 1 and pivotal Phase 2 odronextamab data demonstrated deep and durable responses that were consistent in patients who progress after CAR-T therapy, which is important as they have particularly difficult-to-treat disease and no effective treatment options. Coupled with its overall safety profile, these clinically important results reinforce the potential of odronextamab to treat this aggressive blood cancer."

At ASH, efficacy in R/R DLBCL was presented from 130 CAR-T naïve patients in a Phase 2 cohort (includes those with an opportunity for assessment at 12 weeks; median follow-up: 21 months, range: 3 to 30 months) and 31 CAR-T experienced patients in a dose expansion cohort of a Phase 1 trial (median follow-up: 24 months, range: 3 to 38.5 months). All patients had received at least two prior therapies, including a CD20 antibody and alkylating agent. Patients were treated with a step-up regimen of odronextamab in the first cycle to help mitigate the risk of cytokine release syndrome (CRS) before receiving the full dose of 160 mg. The step-up regimen was modified part way through the trial to further mitigate CRS. Results as assessed by independent central review were as follows:

• Among CAR-T naïve patients, a 49% objective response rate (ORR), with 31% achieving a complete response (CR). The median duration of complete response (mDOCR) was 18 months (95% confidence interval [CI]: 10 months to not evaluable [NE]).
• Among post-CAR-T patients, a 48% ORR, with 32% achieving a CR. The mDOCR was not reached (95% CI: 2 months to NE).

Among 140 patients in the Phase 2 cohort assessed for safety, adverse events (AE) occurred in 99% of patients, with 79% being ≥Grade 3. The most common AEs occurring in ≥20% of patients were CRS (55%), anemia (42%), pyrexia (39%), neutropenia (28%) and hypokalemia (20%). Discontinuations due to an AE occurred in 10% of patients, and there were 5 deaths due to pneumonia (n=3), COVID-19 (n=1) and pseudomonal sepsis (n=1) where the relationship to odronextamab treatment could not be excluded.

CRS was the most common AE, of which 64% of cases were mild (Grade 1) and all resolved within a median time of 2 days (range: 1-133 days). There were no Grade 4 or 5 CRS cases, and the incidence of Grade 2 or higher cases was reduced with the modified step-up regimen when compared to the original (original regimen n=67 vs. step-up regimen n=73; Grade 2: 18% vs. 14%, Grade 3: 7.5% vs. 1%).

Based on these data, the OLYMPIA Phase 3 development program investigating odronextamab in earlier stages of the disease is in the process of being initiated. In the U.S., odronextamab has been granted Fast Track Designation for DLBCL by the FDA. In the European Union, Orphan Drug Designation was granted for DLBCL by the European Medicines Agency. Odronextamab is currently under clinical development and its safety and efficacy have not been fully evaluated by any regulatory authority.

Investor Webcast Information
Regeneron will host a conference call and simultaneous webcast to share updates on the company's hematology portfolio on Wednesday, December 14 at 8:30 AM ET. A link to the webcast may be accessed from the 'Investors and Media' page of Regeneron's website at https://investor.regeneron.com/events.cfm. To participate via telephone, please register in advance at this link. Upon registration, all telephone participants will receive a confirmation email detailing how to join the conference call, including the dial-in number along with a unique passcode and registrant ID that can be used to access the call. A replay of the conference call and webcast will be archived on the company's website for at least 30 days.

About the Trials
ELM-2 is an ongoing, open-label, multicenter Phase 2 trial investigating odronextamab in more than 500 patients across five independent disease-specific cohorts, including DLBCL, follicular lymphoma, mantle cell lymphoma, marginal zone lymphoma and other subtypes of B-cell non-Hodgkin lymphoma (B-NHL). The primary endpoint is ORR according to the Lugano Classification, and secondary endpoints include CR, progression free survival, overall survival, duration of response, disease control rate, safety and quality of life.

ELM-1 is an ongoing, open-label, multicenter Phase 1 trial to investigate the safety and tolerability of odronextamab in patients with CD20+ B-cell malignancies previously treated with CD20-directed antibody therapy. Subcutaneous administration is being evaluated in two disease specific cohorts.

About Diffuse Large B-cell Lymphoma (DLBCL)
One of the most common subtypes of B-NHL, DLBCL is an aggressive form of B-NHL with up to 50% of patients with advanced stage disease progressing after first-line treatment (e.g., relapsing or becoming refractory to treatment). For patients with relapsed/refractory DLBCL, treatment options are limited and prognosis is poor.

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 combination with each other 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, as well as investigational RNA-approaches focused on depleting abnormal proteins or blocking disease-causing cellular signaling.

If you are interested in learning more about our clinical trials, please contact us (clinicaltrials@regeneron.com or 844-734-6643) or visit our clinical trials website.

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 nearly 35 years by physician-scientists, our unique ability to repeatedly and consistently translate science into medicine has led to nine FDA-approved treatments and numerous 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, pain, 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, please visit www.Regeneron.com or follow @Regeneron on Twitter.

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