THE DETAILS: People who received 18 months of infusions with Gammagard fared no better than others given placebo. Gammagard is made from natural antibodies culled from donated blood. Researchers thought it might help remove amyloid, the sticky plaque that clogs Alzheimer patients' brains.
URGENT NEED: About 35 million people worldwide have dementia, and Alzheimer's is the most common type. Current treatments temporarily ease symptoms — there is no known cure.