A European approval for Alzheimer’s drug aducanumab by year-end looks even more in doubt. A week after being called in before the EMA’s Committee for Medicinal Products for Human Use (CHMP) for an oral explanation of the trial data, Biogen Inc. said it received a “negative trend vote” on the marketing authorization application. A formal opinion by the CHMP is expected at its December meeting, but analysts are not optimistic.