Validation of major prognostic models for metastatic urothelial carcinoma using a multi‑institutional cohort of the real world

Background Several prognostic models predicting survival of patients with metastatic urothelial carcinoma (UC) have been developed; however, of them, the first model by Bajorin in 1999 is still the most representative and widely used, and validations of newer models are lacking. This study aimed to validate three major prognostic models for metastatic UC constructed based on clinical trials.