In most cases when a patient undergoes a biopsy on their esophagus any cancer found is located too late to be treated. A recent development could help doctors find the disease before it is too late.
http://www.hcplive.com/conference-coverage/ddw-2015/new-testing-to-find-esophageal-cancer-before-it-starts
New Testing to Find Esophageal Cancer Before it Starts