Biogen Inc., of Cambridge, Mass., reported results from a recently conducted analysis of the long-term extension (LTE) of its ongoing phase Ib study of aducanumab, its treatment for early Alzheimer's disease, including data from the placebo-controlled period and LTE for patients treated with aducanumab up to 24 months in the titration cohort and up to 36 months in the fixed-dose cohorts.