Studies demonstrated that except for some mucinous adenocarcinomas, omentin was not expressed in other cancers, such as biphasic synovial sarcoma, breast carcinoma, colon adenocarcinoma, epithelioid angiosarcoma, epithelioid hemangioendothelioma, gastric adenocarcinoma, lung cancer, ovarian adenocarcinoma, renal cell cancer, and urothelial cancer [87]. This evidence concerns the gene ITLN1 and renal cell adenocarcinoma.