Treating Muscle-invasive Bladder Cancer With A Non-surgical Method Consisting of Anti-PD-1 Therapy and Chemoradiation

The goal of this Phase 2 trial is to evaluate a non-surgical bladder-preserving treatment mode which consists of neoadjuvant chemotherapy plus anti-programmed cell death protein 1 (anti-PD-1) therapy followed by radiotherapy plus concurrent anti-PD-1 therapy. The main questions it aims to answer are: (i) whether the anti-PD-1 antibody, toripalimab, is effective in treating muscle-invasive bladder cancer (MIBC), when combined with chemoradiation; (ii) whether toripalimab is safe in combination with chemoradiation. Participants will receive 3 cycles of neoadjuvant treatment containing chemotherapy with gemcitabine and cisplatin/carboplatin, plus toripalimab. Then the ones without progressive disease will receive radical radiotherapy plus 2 cycles of concurrent toripalimab.