Biogen Inc. and Eisai Co. Ltd. reported that the highest dose of BAN2401 significantly cleared amyloid from the brain and improved cognition in patients with mild Alzheimer's disease, but questions remain about the exclusion of certain individuals from the high dose arm and whether that confounded the results from the large Phase II trial.
Reflecting some investor uncertainties over the data, Biogen's stock declined by more than 11% in after-hours trading after Eisai Chief...






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