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FDA approves leucovorin as first drug for rare genetic disorder, after touting it as autism treatment

FDA approved leucovorin for cerebral folate deficiency, an ultrarare genetic brain disorder affecting fewer than 1 in a million, after reviewing case reports and literature.

  • On Tuesday, the U.S. Food and Drug Administration approved leucovorin as the first labeled treatment for receptor‑1 cerebral folate deficiency in children and adults.
  • Senior FDA officials said the review narrowed to strongest evidence for patients with the folate receptor‑1 mutation and relied on a systematic literature review, not randomized, placebo‑controlled clinical trials.
  • Published patient‑level reports documented the ultrarare condition affects fewer than 50 cases worldwide, with children becoming seizure‑free or asymptomatic after leucovorin treatment, case studies show.
  • After prescriptions surged, officials said they would permit foreign imports to ease shortages as families of children with autism report difficulty filling leucovorin prescriptions.
  • The White House had touted the drug in September, prompting heightened attention, but medical societies remain skeptical, a supporting autism study was retracted earlier this year, and GSK does not plan to relaunch the branded product.
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King5 News broke the news in Seattle, United States on Tuesday, March 10, 2026.
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