Message : Required fields TOKYO, July 29, 2021 /PRNewswire/ -- Eisai Co., Ltd. (Headquarters: Tokyo, CEO: Haruo Naito, "Eisai") and Biogen Inc. (Nasdaq: BIIB, Corporate headquarters: Cambridge, Massachusetts, CEO: Michel Vounatsos, "Biogen") today announced results of a longitudinal preliminary assessment of the clinical effects of lecanemab (development code: BAN2401) — granted Breakthrough Therapy designation by the U.S. Food and Drug Administration (FDA) in June 2021 — following 18 months of treatment in the open-label extension (OLE) of the Phase 2b proof-of-concept study in subjects with early Alzheimer's disease (AD) (Mild Cognitive Impairment [MCI] due to AD and mild AD) at the Alzheimer's Association International Conference (AAIC) held in Denver, Colo., United States and virtually from July 26 to 30, 2021 (Presentation No.: 57780).