{"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Tumor-associated glycoprotein 72 (TAG-72) has been shown to be expressed in a wide variety of epithelial malignant tissues. TAG-72 antigen is a high molecular glycoprotein found on the surface of many cancer cells, including breast, colon and pancreatic cells. It is present in human adenocarcinomas and in lesser amounts, non-neoplastic tissues. According to literature the majority of human adenocarcinomas display some cell populations that are positive for TAG-72."}]}]}