Survival After Partial Cystectomy for Variant Histology Bladder Cancer Compared With Urothelial Carcinoma: A Population-based Study

Within the Surveillance, Epidemiology, and End Results database, we evaluated cancer-specific mortality (CSM) in 248 patients with T1-T2N0M0 variant histology bladder cancer (non–urothelial carcinoma of the urinary bladder [UCUB]) treated with partial cystectomy (PC). In Cox regression models, patients with non-UCUB treated with PC exhibited higher CSM compared with patients with urothelial carcinoma treated with PC. In contrast, patients with non-UCUB treated with PC had similar CSM compared with patients with non-UCUB treated with radical cystectomy.