Post written by Prasad G. Iyer, MD, MSc, from the Division of Gastroenterology & Hepatology, Mayo Clinic, Rochester, Minnesota, USA. This article summarizes the third step in the development and validation of a nonendoscopic, minimally invasive molecular test to detect a precursor to esophageal adenocarcinoma: Barrett’s esophagus. Esophageal adenocarcinoma is a rare but lethal malignancy …