Purpose: To test aerobic exercise as a possible treatment for people with early-stage Alzheimer's disease.
Purpose: To examine whether the potential benefits of low-dose aspirin outweigh the risks in people over age 70.
Purpose: To standardize imaging studies using florbetapir F 18 PET to provide information on amyloid burden.
Purpose: To assess the efficacy and safety of MK-8931 as a possible treatment for Alzheimer's disease.