EPCAM and cancer: When EpCAM is overexpressed, some cancers such as stage I or II gastric cancer, stage II NSCLC, clear cell renal cell carcinoma, and stage II colon cancer show better survival while others such as node-positive breast cancer, epithelial ovarian cancer, gall bladder cancer, cholangiocarcinoma, ampullary pancreas cancer, squamous cell cancer of the esophagus, and squamous cell head and neck cancer do worse.