The FDA's accelerated-approval pathway, formalized in 1992 amid the AIDS crisis, lets drugs reach patients based on a "surrogate endpoint" (a lab measure thought to predict clinical benefit) before full Phase III evidence of patient outcomes is in. Drugmakers commit to confirmatory studies post-approval.
High-profile cases — including the Alzheimer's drug aducanumab and certain cancer therapies — have intensified debate. Some approved drugs have later failed to show clinical benefit; some confirmatory trials have taken many years or never been completed. Yet the pathway has also delivered transformative therapies, especially in oncology and rare diseases, that patients could not otherwise have accessed in time.
Reform proposals include tightening surrogate-endpoint standards, enforcing confirmatory-trial deadlines, automatic withdrawal when trials fail or stall, and broader transparency about evidence at approval.