Biogen and Eisai suffer amid Alzheimer's data confusion
Investors were initially encouraged when early indications pointed to a positive response among Alzheimer’s patients among patients receiving an anti-amyloid beta protofibril antibody from US biotech Biogen (Nasdaq: BIIB) and Japanese pharma major Eisai (TYO: 4523).
The drug, BAN2401, had shown a reduction in amyloid plaques, the protein that, according to many hypotheses, is behind the development of Alzheimer’s.
But when the companies presented more detailed data on the Phase II Study 201 trial late on Wednesday, the companies’ share started to go the other way.
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