Part A of the study In Part A, subjects will receive AZD4547 80mg BID orally for cycles every 21 days and terelizumab 200mg will be an intravenous infusion (IV) 200mg every 3 weeks. Subsequent subjects in Part A should be administered at least 7 days after the first dose of the first subject (sentinel subject). . Tolerability will be assessed based on the incidence of dose-limiting toxicity (DLT) observed in cycle 1 (21 days). Part B; If a DLT event occurs in> 1 of the 6 DLT-evaluable subjects, With the consent of the investigator and the sponsor, An additional combined regimen cohort of six patients with a lower AZD4547 dose (AZD4547 60mg BID + Tislelizumab 200mg Q3W) will be initiated. I A specific dose / regimen of subjects and no more than one subject with DLT events will be selected to confirmation for confirmation for use in the Part B study. After cycle 1, subjects will continue to receive combination therapy in one cycle every 21 days until disease progression, death, loss to follow-up, voluntary withdrawal of informed consent, occurrence of intolerable toxicity, investigator decision to terminate treatment, or the end of the entire study. Safety assessments will be performed in each visit cycle, including the incidence and severity of adverse events (according to CTCAEv5.0) and laboratory abnormalities Study Part B Patients with locally advanced or metastatic urothelial carcinoma harboring FGFR2 / 3 alterations will follow the Simon's optimal two-stage design. It was considered efficacy evaluable when tumor assessment results were available at both baseline and after treatment
This trial is an open, phase II clinical study. The study is divided into two parts: A and B, and the part A evaluate the safety and tolerability of AZD4547 combined with Tislelizumab in patients with locally advanced or metastatic urothelial cancer, determine the recommended dose of midoral AZD4547 combined with Tislelizumab in a Chinese patient population. Part B study will evaluate the efficacy of this recommended dose combined with Tislelizumab in patients with locally advanced or metastatic urothelial cancer with FGFR2 / 3 alterations , and will also further evaluate the safety, tolerability, and PK and PD characteristics of AZD4547 in combination with Tislelizumab.