A total of 23 patients were enrolled in this study, all of whom were cT2-T4aNxM0 MIBC and received 2̃4 cycles CG (gemcitabine and cisplatin) NCT....our results showed that 3 patients in the non-responder group had MAST4 gene mutations, but not in the responder group, and there was a significant difference between the two groups (p < 0.05).