Hengruiyuanzheng (Shenzhen) Biotechnology Co., Ltd.

The primary objective is to evaluate the improvement in PFS of MASCT-I+BSC maintenance therapy compared with single-collected PBMC cells+BSC in subjects with urothelial carcinoma who have achieved clinical benefits after standard first-line chemotherapy. The secondary objective is to evaluate other efficacy indicators of MASCT-I+BSC for maintenance therapy after standard first-line chemotherapy, and further evaluate the safety of MASCT-I in this population.