This is a multi-center study whose aim is to define the epidemiology and genetics of Barrett's esophagus and adenocarcinoma. The researchers have studied families affected with Barrett's esophagus and esophageal adenocarcinoma, a specific type of cancer of the esophagus. They have found that Barrett's and esophageal cancer occur at a younger age in these families suggesting that familial Barrett's esophagus is a genetically inherited disease.