Cox regression analysis (Figure S1A) showed that KLRB1 was a low-risk factor associated with PFI in BLCA (p = 0.021), BRCA (p = 0.031), CESC (p = 0.025), cholangiocarcinoma (CHOL, p = 0.047), LIHC (p = 0.006), and UCEC (p = 0.033). Here, KLRB1 is linked to bladder transitional cell carcinoma.