Development of Early Detection Signs for Gastrointestinal Cancer

Patients will be asked to provide approximately 60-120 cc (4-8 tablespoons) of peripheral blood. Select patients who undergo surgical resection of their tumor will be asked to provide portions of the tumor and tumor draining lymph nodes for further analysis. In addition patients undergoing surgical resection may be asked to provide additional peripheral blood samples at time of routine follow-up (at least 4-6 weeks after initial blood draw and between subsequent draws).