After A Big Failure, Scientists And Patients Hunt For A New Type Of Alzheimer's Drug

Scientists are setting a new course in their quest to treat Alzheimer's disease.

The shift comes out of necessity. A series of expensive failures with experimental drugs aimed at a toxic protein called amyloid-beta have led to a change in approach.

The most recent disappointment came in March, when drugmaker Biogen and its partner Eisai announced they were halting two large clinical trials of an amyloid drug called aducanumab.