Healthy seniors tested in bid to block Alzheimer’s

Researchers expect to screen thousands of volunteers ages 65 to 85, hunting those whose brain scans show they have a sticky build-up believed to play a key role in development of Alzheimer’s.

That does not guarantee someone will get sick. But the study will test if early use of a drug designed to target the gunk makes a difference for those who do.

Whether the drug works or not, researchers say the unique study should give new insight into Alzheimer’s risks and how people cope with the knowledge.