KCTD12 mRNA expression levels in bladder urothelial carcinoma (BLCA), BRCA, CESC, COAD, kidney renal clear cell carcinoma (KIRC), LUAD, lung squamous cell carcinoma (LUSC), rectal adenocarcinoma (READ), and uterine corpus endometrial carcinoma (UCEC) were significantly lower than those in normal tissues (P < 0.01). This evidence concerns the gene KCTD12 and rectum adenocarcinoma.