- Patients must have histological or cytological confirmed esophageal adenocarcinoma or adenocarcinoma of the gastroesophageal junction (this diagnosis will be rendered by the gastroenterology endoscopist, and refers to tumors at the junction of the esophagus and the stomach, where >50% of the tumor mass is above the diaphragm). Tumors must not have greater than 2cm extension into the the cardia.