March 20 (Reuters) - The U.S. Food and Drug Administration's staff reviewers on Monday did not raise any new safety concerns about Biogen Inc's BIIB.O experimental drug for treating a rare type of amyotrophic lateral sclerosis, also known as Lou Gehrig's disease.
(Reporting by Raghav Mahobe and Bhanvi Satija in Bengaluru; Editing by Krishna Chandra Eluri)
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