Chicago — In approving the first new Alzheimer’s drug in nearly 20 years, the US Food and Drug Administration (FDA) is taking its biggest risk yet with a strategy that allows new therapies onto the market without strong evidence that they work, regulatory and scientific experts say.

The Biogen drug, Aduhelm, was authorised based on evidence that it can reduce brain plaques, a likely contributor to Alzheimer’s, rather than proof that it slows progression of the lethal mind-wasting disease...

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