STEAP2 and uterine corpus endometrial carcinoma: Missense mutation of STEAP2 was the main type of genetic alteration, and mutation in E390 of the ferric oxidoreductase domain, which was detected in uterine corpus endometrial carcinoma (n = 3), colorectal adenocarcinoma (n = 1), and skin cutaneous melanoma (n = 1), induced a frameshift mutation of the STEAP2 gene, translation from glutamate (E) to another amino acid at position 390 of the STEAP2 protein, and subsequent STEAP2 protein truncation.