Regeneron abandons RSV drug after Phase III flop
US biotech firm Regeneron Pharmaceuticals (Nasdaq: REGN) saw its share price fall 2.5% in pre-market trading, after it announced a Phase III trial failure for its investigational drug for respiratory syncytial virus (RSV). The stock recovered with a 1.37% rise to $472.96 by late-morning.
The company said that a Phase III study evaluating suptavumab (REGN2222), an antibody, did not meet its primary endpoint of preventing medically-attended RSV infections in infants.
Suptavumab did show signs of efficacy in a subgroup of patients. Adverse events were generally balanced between suptavumab and placebo. Notwithstanding, Regeneron said it plans to discontinue further clinical development of this antibody.
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