Eisai Co., Ltd. and Biogen, Inc. shocked investors and just about everyone else who has tracked the progress of amyloid-targeting therapies for Alzheimer’s disease when they reported what appear to be the first unequivocal Phase III success for the field. Both companies saw their stock prices surge in the US as a result and other Alzheimer’s drug developers, regardless of the mechanism of action for their candidates, saw their valuations increase as well.
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