“This might be the worst approval decision that the F.D.A. has made that I can remember,” said Dr. Aaron Kesselheim, a professor of medicine at Harvard Medical School and Brigham and Women’s Hospital, who submitted his resignation Thursday after six years on the committee. He said the agency’s approval of the drug, aducanumab, which is being marketed as Aduhelm, a monthly intravenous infusion that Biogen has priced at $56,000 per year, was wrong “because of so many different factors, starting from the fact that there’s no good evidence that the drug works.”... The committee had found that the evidence did not convincingly show that Aduhelm could slow cognitive decline in people in the early stages of the disease — and that the drug could cause potentially serious side effects of brain swelling and brain bleeding. None of the 11 members of the committee considered the drug ready for approval: Ten voted against and one was uncertain.