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Beyond the grabby headlines, punchy tweets, and stock market bounces, Biogen’s surprise resuscitation of a once-doomed treatment for Alzheimer’s disease drew a hefty dose of caution — and even some skepticism.

The basis for Biogen’s decision was a re-analysis of data from late-stage studies of its drug, aducanumab. Those data, the company said, showed the treatment reduced the rate of patients’ cognitive decline.

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