FILE - In this Aug. 14, 2018 file photo, Dr. William Burke goes over a PET brain scan at Banner Alzheimers Institute in Phoenix. The drug company Biogen Inc. says it will seek federal approval for a medicine to treat early Alzheimer's disease, a landmark step toward finding a treatment that can alter the course of the most common form of dementia.The announcement Tuesday, Oct. 22, 2019, is a surprise because the company earlier this year stopped two studies of the drug, called aducanumab, after partial results suggested it was not working. (AP Photo/Matt York, File)
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