The First Clinical Trial of a Cocktail of Antibodies for the Treatment of COVID-19

Regeneron Pharmaceuticals, Inc. announced initiation of the first clinical trial of REGN-COV2, its investigational dual antibody cocktail for the prevention and treatment of COVID-19. The REGN-COV2 clinical program will consist of four separate study populations: hospitalized COVID-19 patients, non-hospitalized symptomatic COVID-19 patients, uninfected people in groups that are at high-risk of exposure (such as healthcare workers or first responders) and uninfected people with close exposure to a COVID-19 patient (such as the patient’s housemate). The placebo-controlled trials will be conducted at multiple sites.

Regeneron scientists evaluated thousands of fully-human antibodies produced by the company’s proprietary VelocImmune® mice, which have been genetically-modified to have a human immune system, as well as antibodies isolated from humans who have recovered from COVID-19. They selected the two most potent, non-competing and virus-neutralizing antibodies and have scaled them up for clinical use with the company’s in-house VelociMab® and manufacturing capabilities. The two antibodies bind non-competitively to the critical receptor binding domain (RBD) of the virus’s spike protein, which diminishes the ability of mutant viruses to escape treatment, as demonstrated in upcoming Science publications of preclinical research.

Regeneron used the same ‘rapid response’ capabilities and cocktail approach to develop REGN-EB3, a novel triple antibody treatment for Ebola that is now under regulatory review by the U.S. Food and Drug Administration (FDA). REGN-COV2’s preclinical development and preclinical/clinical manufacturing has been funded in part with federal funds from the Biomedical Advanced Research and Development Authority (BARDA).

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