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Shares of Biogen BIIB, -1.43% were down 0.6% in premarket trading on Monday, the day after the company said an experimental amyotrophic lateral sclerosis (ALS) drug did not meet the primary endpoint in an open-label, Phase 3 clinical trial. Biogen said it is considering next steps for the investigational drug, tofersen, which was being tested in people with a rare form of the neurodegenerative disease.
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