Dr Vaibhav Sahai reviews the toxicities that have been encountered in clinical trials with FGFR inhibitors. He suggests that most of these adverse events are class effects and include hyperphosphatemia (which is relatively easy to manage with dietary restrictions and phosphate-binding agents), nail and hair changes, stomatitis, and retinal epithelial changes. In contrast, Dr Angela Lamarca considers the adverse events associated with chemotherapy, including myelosuppression, nausea, vomiting, diarrhea, and others. Dr Milind Javle suggests that the toxicities encountered with chemotherapy are significantly worse than those with FGFR inhibitors.