This study is about Alzheimer's disease, which is a condition that causes memory problems. It focuses on people with a specific type of Alzheimer's that is passed down through families due to a genetic mutation. This mutation is linked to early onset Alzheimer's, meaning it starts at a younger age.

The study is testing new treatments to see if they can slow down or improve symptoms. Participants might need to take a study drug or a placebo (a fake treatment for comparison). They will have tests like memory quizzes, brain scans (like MRI and PET), and fluid tests to check how the treatment is working.

• The study lasts about four years, with regular visits for tests and assessments.
• Participants may receive a new treatment, but they won't know if they are getting the real drug or placebo.
• Travel may be required to a study site, and some costs might be covered.

Participants need to be between 18-80 years old and have a family history of this Alzheimer's mutation. The study is double-blind, meaning even the researchers don’t know who gets the real treatment to ensure fairness.