FAR Publishing Limited Jul 30 2025 A comprehensive new review reveals both the promise and challenges of using fecal microbiota transplantation (FMT) to enhance cancer immunotherapy effectiveness. The study, published in Gut Microbes , examines the controversial effects of transferring healthy gut bacteria to cancer patients receiving immune checkpoint inhibitors (ICIs). FMT's impact on immune checkpoint inhibitor efficacy varies dramatically across studies. Some clinical trials show remarkable