MUC16 and malignant mesothelioma: MUC16 (known as CA125), a well-established antibody, is a useful tool for classification of a variety of tumors, such as adenocarcinomas of the colon, breast carcinomas, malignant mesothelioma, uterine adenomatoid tumor, lung bronchoalveolar carcinoma, ovarian endometrioid and serous carcinomas.