Bengaluru — Biogen revived plans on Tuesday to seek US approval for Alzheimer’s treatment Aducanumab, surprising investors and saying data from more patients in two discontinued studies showed the drug reduced the decline of patients suffering from the disease.

The drugmaker’s shares soared 27% in response to the decision, recouping almost all of the $18bn lost from the company’s market value when it said in March it was abandoning the two studies...

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