Eisai and Biogen launch LEQEMBI, a humanized anti-soluble aggregated amyloid-beta monoclonal antibody, in South Korea for treating mild cognitive impairment due to Alzheimer's disease or mild AD dementia. LEQEMBI selectively binds to soluble and insoluble Aβ aggregates, reducing both protofibrils and plaques in the brain, and is the first treatment shown to slow cognitive and functional decline through this mechanism.