All patients must be eligible for care at the Kansas City VA Medical Center. Those presenting to the Kansas City VA endoscopy laboratory for their "standard BE surveillance" endoscopy. Patients with a history of BE will be identified and contacted from the existing databank. Patients with newly diagnosed BE in the endoscopy laboratory after their procedure is completed and biopsy results are available. Patients undergoing upper endoscopy for evaluation of GERD symptoms. Control group of patients undergoing upper endoscopy for any reason other than the ones stated above.