HTR7 and bladder transitional cell carcinoma: In terms of clinical staging, we found that the expression of HTR7 in BLCA, BRCA, and SKCM was negatively correlated with the clinical staging, and HTR7 was also lowly expressed in these tumor tissues, which further suggests that HTR7 may have a cancer-suppressive role in BLCA, BRCA, and SKCM.