Regeneron (REGN) Announces IDMC Finds Clear Efficacy for REGEN-COV in Phase 3 COVID-19 Outpatient Outcomes Trial

Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) today announced changes to the Phase 3 trial assessing investigational REGEN-COV™ (casirivimab with imdevimab) in non-hospitalized patients ("outpatients") with COVID-19, following recommendations from the Independent Data Monitoring Committee (IDMC). The IDMC found clear clinical efficacy on reducing the rate of hospitalization and death with both the 1,200 mg and 2,400 mg doses of REGEN-COV compared to placebo, and recommended stopping enrollment into the placebo group.

Regeneron is following the IDMC recommendation and will immediately stop enrolling patients in the placebo group. The trial will continue to enroll patients into both the 1,200 mg and 2,400 mg REGEN-COV treatment groups. The company has not yet had access to any of the unblinded data, including the relative treatment benefit of the 1,200 mg and 2,400 mg doses, and will share detailed results when available in March 2021.

"We appreciate the time and guidance of the IDMC and are extremely grateful to the thousands of patients and investigators who have participated in this more than 8,000-patient clinical trial," said David Weinreich, M.D., Executive Vice President and Head of Global Clinical Development at Regeneron. "REGEN-COV is now available in the U.S. to indicated high-risk non-hospitalized patients under an Emergency Use Authorization, and we hope to submit these results as part of a full Biologics License Application."

"In addition to the clear-cut efficacy that the IDMC has observed in this trial, it's reassuring that preclinical data from our labs and independent researchers show that REGEN-COV effectively neutralizes emerging strains of the virus, which are becoming increasingly common," said George D. Yancopoulos, M.D., Ph.D., President and Chief Scientific Officer at Regeneron. "Our cocktail approach using two functionally-independent antibodies safeguards against variants that may impact potency to a single antibody."

The development and manufacturing of REGEN-COV have been funded in part with federal funds from the Biomedical Advanced Research and Development Authority (BARDA), part of the U.S. Department of Health and Human Services, Office of the Assistant Secretary for Preparedness and Response, under OT number: HHSO100201700020C.

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