UPDATE 1-Biogen's Alzheimer's drug slows mental decline in early study
March 20, 2015 at 11:11 AM EDT
March 20 (Reuters) - An experimental drug from Biogen Idec Inc became the first Alzheimer's treatment to significantly slow cognitive decline and reduce what is believed to be brain-destroying plaque in patients with early and mild forms of the disease, according to a small study likely to reignite hopes of a treatment.