Lecanemab, an antibody therapy targeting amyloid-beta protofibrils in patients with early Alzheimer’s disease, achieved positive results in a Phase 3 study, paving the way for regulatory reviews in the US, EU and Japan, the developer Eisai Inc announced on 28 September. The study, called Clarity AD, met the primary endpoint as well as key secondary targets, confirming that lecanemab’s mechanism of action is able to reduce cognitive clinical decline in Alzheimer's patients. Lecanemab works by binding to soluble amyloid-beta protofibrils.