DIAN/A4/API (Dominantly inherited Alzheimer Network/Anti-Amyloid Treatment in Asymptomatic AD/Alzheimer's prevention initiative)の意義と進行状況 (特集 認知症と類縁疾患 : 最新の研究動向) -- (根治治療(療法)薬(Disease-modifying therapy)の開発状況)