A new treatment for Alzheimer’s offers hope—but raises questions, too
Hindustan TimesFOR DECADES the search for a drug to treat Alzheimer’s disease had seemed a costly wild-goose chase. In a trial involving 1,736 people showing early symptoms of Alzheimer’s, donanemab, developed by Eli Lilly, an American firm, was shown to have “significantly slowed” the progression of the disease—by 35% after 76 weeks by one measure. The result, which headlined the annual Alzheimer’s Association International Conference, held this year in Amsterdam, was hailed as a “breakthrough” and “turning-point”. Like its two predecessors, donanemab is an antibody whose target is a protein, beta-amyloid, that forms clumps, or plaques, in the brains of people with Alzheimer’s. The trial’s success is another piece of evidence in favour of the “amyloid hypothesis”—the idea that the plaques are not just a symptom of Alzheimer’s, but a cause.