A Study to Evaluate the Efficacy and Safety of Pemigatinib (INCB054828) in Subjects With Urothelial Carcinoma - (FIGHT-201)

Inclusion Criteria: * 20 years and older in Japan * Histologically documented metastatic or surgically unresectable urothelial carcinoma; may include primary site from urethra, ureters, upper tract, renal pelvis, and bladder. * Eastern Cooperative Oncology Group (ECOG) performance status of 0-2. * Life expectancy ≥ 12 weeks. * Radiographically measurable per RECIST v1.1. * Documented FGF/FGFR alteration and have either 1a) failed at least 1 previous treatment for their metastatic or surgically unresectable urothelial carcinoma (ie, chemotherapy, immunotherapy) or 1b) have not received chemotherapy due to poor ECOG status or 2) have insufficient renal function. Exclusion Criteria: * Prior receipt of a selective FGFR inhibitor. * Use of any potent CYP3A4 inhibitors or inducers within 14 days or 5 half-lives (whichever is shorter) before the first dose of study drug. * Inability or unwillingness to swallow pemigatinib or significant gastrointestinal disorder(s) that could interfere with the absorption, metabolism, or excretion of pemigatinib.