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HopeFOL, or FOL of problems? Leucovorin for autistic symptoms
Lisa M Holle1, Jeremy Kratz2, Elizabeth N Dow-Hillgartner3
1University of Wisconsin School of Pharmacy, University of Wisconsin Carbone Cancer Center, Madison, WI 53705, United States.
The Oncologist
|July 31, 2026
Summary
Leucovorin is approved for a rare folate receptor alpha gene mutation, not autism, despite flawed data. Increased demand for autism may cause shortages for cancer patients, impacting treatment outcomes.
Area of Science:
- Oncology
- Pharmacology
- Genetics
Background:
- The U.S. Food and Drug Administration (FDA) announced leucovorin approval for autism symptoms in late 2025, based on flawed data.
- Leucovorin is only proven safe and effective for a rare genetic syndrome (FLOT1-CFTD) caused by a folate receptor alpha gene mutation, with FDA approval in March 2026.
- Despite limited evidence, patients with autism are seeking leucovorin, raising concerns about its availability for established oncological uses.
Purpose of the Study:
- To highlight the potential impact of leucovorin's off-label use for autism on cancer patient care.
- To emphasize the importance of evidence-based prescribing and the potential consequences of drug shortages in oncology.
- To outline the role of the oncology healthcare team in managing medication access.
Main Methods:
- Review of FDA approval status and scientific literature regarding leucovorin.
- Analysis of the potential impact of increased leucovorin demand on medication supply chains.
- Discussion of historical drug shortages and their consequences in cancer treatment.
Main Results:
- Leucovorin's efficacy and safety are established for FLOT1-CFTD, not autism.
- Increased demand for leucovorin for autism could exacerbate existing shortages, affecting cancer patients.
- Past shortages have led to suboptimal cancer treatment, increased medical errors, and higher costs.
Conclusions:
- Access to leucovorin should be restricted to FDA-approved indications supported by robust scientific evidence or clinical trials.
- Oncology healthcare teams must actively manage the implications of off-label drug use on patient care and resource availability.
- Ensuring medication availability for life-threatening conditions like cancer must be prioritized over unproven indications.
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