PCDHA1 and bladder transitional cell carcinoma: In bladder urothelial carcinoma, high-risk patients (low signature 1 score) harboring mutant alleles of PCDHA1 had ~ 50% increased mortality at 5 years compared to low-risk patients (high signature 1 score) with wild-type PCDHA1 (P = 0.016; Fig. 4).