-New testing method highlights link between protofibrils and biomarkers for neurodegeneration- -Patient and caregiver perspectives on five-year treatment with lecanemab - - Utilization of blood biomarkers to predict brain amyloid accumulation in AHEAD study of preclinical AD- TOKYO and CAMBRIDGE, Mass. , Oct. 30, 2024 /PRNewswire/ -- Eisai Co.

, Ltd. (Headquarters: Tokyo , CEO: Haruo Naito , "Eisai") and Biogen Inc. (Nasdaq: BIIB, Corporate headquarters: Cambridge, Massachusetts , CEO: Christopher A.

Viehbacher , "Biogen") announced today that the latest findings for lecanemab-irmb (U.S. brand name: LEQEMBI ® ), an anti-amyloid beta (Aβ) protofibril* antibody for the treatment of early Alzheimer's disease (AD), were presented at the Clinical Trials for Alzheimer's Disease Conference (CTAD), held in Madrid, Spain , and virtually.

Benefits of Continued Treatment with Lecanemab for People with Early AD In July 2024 at the Alzheimer's Association International Conference (AAIC) 2024, results from the open-label long-term extension study (OLE) following the core study of the lecanemab Phase 3 Clarity AD study were presented, showing that the mean change from baseline in CDR-SB (global cognitive and functional scale) in the lecanemab treated group relative to the placebo group was -0.45 at 18 months, and at 36 months, this expanded to -0.95 compared to a prespecified natural history** cohort of AD.

There was a 30% reduction in the relative risk of progressing to the next disease s.