IDO1 and bladder transitional cell carcinoma: Interestingly, we were able to verify that IDO1 had a protective prognostic role in BLCA (OS: P = 0.057; RFS: P = 0.0015), BRCA (OS: P = 0.027; RFS: P = 0.024), OV (OS: P = 0.00033; RFS: P = 0.0013), SARC (OS: P = 0.00014; RFS: P = 0.012), UCEC (RFS: P = 0.0058), CESC (OS: P = 0.017), HNSC (OS: P = 0.011), STAD (OS: P = 0.0054), LUAD (OS: P = 0.047), STSD (RFS: P = 0.025), and READ (OS: P = 0.0079).