You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following is not a risk factor for carcinoma of the esophagus? and explain in detail?
Barrett esophagus develops in patients with chronic GERD and represents columnar metaplasia of the esophageal squamous mucosa. Barrett esophagus is a risk factor for development of esophageal adenocarcinoma. Esophageal squamous cell carcinoma is associated with alcohol and tobacco use, povey, caustic esophageal injury, achalasia, tylosis, and Plummer-Vinson syndrome. Some serotypes of Helicobacter pylori are associated with decreased risk of esophageal adenocarcinoma. Helicobacter pylori infection can be a risk factor for development of MALT lymphoma in stomach.