Barrett’s Esophagus, which is a condition in which tissues that resembles the tissues of the intestinal lining, substitutes the tissues that line the esophagus. This is not a malignant disease unless the abnormal chances in the tissue progresses to dysplasia and then esophageal cancer.
https://www.news-medical.net/health/Barretts-Esophagus-Preventing-Progression.aspx
Barrett's Esophagus Preventing Progression