Erdafitinib for the treatment of metastatic bladder cancer.

Introduction: Since the approval of immune checkpoint inhibitors (ICIs), there has been continuing and significant progress in urothelial cancer (UC) treatment. However, only about one fifth of UC patients respond to ICI. Recently, erdafitinib was developed for treating locally advanced or metastatic UC (mUC) with FGFR3 or FGFR2 alterations, accounting for 15-20% of patients. Erdafitinib is the first targeted therapy ever approved for mUC.Areas covered: This review summarizes the preclinical and clinical data on erdafitinib for UC. PubMed search and relevant articles presented at international conferences were used for the literature search.Expert opinion: The FDA approval of erdafitinib provided a new treatment option for FGFR-altered UC progressing on platinum-based chemotherapy. It is not clear whether FGFR inhibitor is a preferred second-line treatment choice to ICI. Compared to ICI, erdafitinib has a better response rate in patients with visceral metastases. However, shorter duration of response and toxicity profile of erdafitinib, particularly ocular toxicity, is an important consideration. Regular eye exams are recommended by the FDA. Tumor profiling during upfront therapy may help identify those who benefit at time of progression. In summary, a high unmet need remains for new drugs in chemotherapy- and ICI-refractory UC.