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Investing.com21d agobearish
Biogen tumbles 8.7% as breakthrough Alzheimer’s data is clouded by dosing paradox

Investing.com -- Biogen Inc. (NASDAQ:BIIB) shares fell nearly 9% following the Phase 2 CELIA readout of its highly anticipated Alzheimer’s therapy, diranersen. While the drug achieved a major scientific milestone by robustly clearing tau pathology, an unexpected inverse dose response—where the lowest dose performed the best—left Wall Street analysts confused and triggered a sell-off. Diranersen missed its primary endpoint: proving a dose-dependent response on the CDR-SB, a key measure of cogniti