NCT06364904 2025-02-21A Clinical Trail to Determine the Safety and Efficacy of the Combination of Tislelizumab With Cisplatin and Gemcitabine, With or Without Trilaciclib for Patients With Untreated Unresectable and Metastatic Urothelial Carcinoma.Sun Yat-Sen Memorial Hospital of Sun Yat-Sen UniversityPhase 3 Not yet recruiting210 enrolled