Just as it is for terminally ill cancer patients, time is of the essence for people in the early stages of Alzheimer’s disease. Thus, the clinical meaningfulness of Eli Lilly and Co.’s donanemab is the time it gives patients before the disease progresses, Reisa Sperling, a neurology professor at Harvard Medical School and director of the Center for Alzheimer’s Research and Treatment at Brigham and Women’s Hospital, told the U.S. FDA’s Peripheral and Central Nervous System Drugs Advisory Committee June 10.