Research Breakthrough: Researchers at Ohio State University found that probiotic supplements may help gynecologic cancer patients reduce radiation-related gut side effects like diarrhea and cramping, while prebiotics alone showed little benefit.
Researchers at the Ohio State University Medical Center performed a systematic review to look at whether probiotics (beneficial live microbes) and prebiotics (fiber that feeds good gut bacteria) help patients who are going through treatment for gynecologic cancers.
Across nine randomized trials involving 663 patients—most receiving pelvic radiation for cervical or endometrial cancer—probiotics consistently lowered the risk and severity of radiation-related diarrhea, reducing the need for anti-diarrheal medicines. One small trial also found fewer post-op complications with a probiotic after gynecologic surgery. By contrast, prebiotics or fiber alone showed little benefit for radiation side effects. No notable safety problems were reported with either approach.
However, current research has important gaps. Different studies used different probiotic strains and doses, making it hard to recommend a specific product, and very few measured changes in the gut microbiome itself. Crucially, none of the trials tested whether probiotics or prebiotics improve cancer outcomes like tumor response to treatment, progression-free survival, or overall survival.
Taken together, probiotics look promising for easing radiation-related gut symptoms in gynecologic cancers, but larger trials are needed to identify the best formulations, confirm safety with various treatments, and determine whether these microbiome-targeted strategies can also improve long-term cancer outcomes.
Read more:
Assessment of Probiotic and Prebiotic Use in Gynecologic Cancer Patients: A Systematic Review, published in American Journal of OBGYN on September 25, 2025.
Ovarian Cancer Research Alliance (OCRA) Support
- OCRA Grantee Co-Authors include Laura Chambers, DO, The Ohio State University.
