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Sanofi and Regeneron announce positive topline Phase 2 results for IL-33 antibody in asthma

Sanofi and Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) have announced that a Phase 2 proof-of-concept trial evaluating the investigational IL-33 antibody REGN3500 (SAR440340) met the primary endpoint of improvement in loss of asthma control when comparing REGN3500 monotherapy to placebo. The trial also met a key secondary endpoint, demonstrating REGN3500 monotherapy significantly improved lung function compared to placebo. 

In the trial, the greatest improvement was observed in patients with blood eosinophil levels ≥300 cells/microliter. Patients treated with Dupixent® (dupilumab)  monotherapy did numerically better than REGN3500 across all endpoints, although the trial was not powered to show differences between active treatment arms. The combination of REGN3500 and Dupixent also did not demonstrate increased benefit compared to Dupixent monotherapy in this trial. More detailed results will be presented at an upcoming medical meeting

“This trial suggests that REGN3500 may provide an alternative targeted approach for patients suffering from asthma,” said George D. Yancopoulos, M.D., Ph.D., President and Chief Scientific Officer at Regeneron. “We look forward to working with Sanofi to advance REGN3500 through our asthma clinical trial program, as well as continuing our ongoing trials in atopic dermatitis and chronic obstructive pulmonary disease.”  

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