Moreover, DPP4/CD26 is detectable on many types of cancer cells; examples include thyroid carcinoma, gastrointestinal stromal tumor, prostate carcinoma, lung carcinoma, hepatic cancer, colon carcinoma, renal cell cancer (RCC), and malignant pleural mesothelioma (MPM). This evidence concerns the gene DPP4 and malignant pleural mesothelioma.