GAST and adenocarcinoma: It should be emphasized once again that atrophy of the mucous membrane in the stomach’s body, as a result of autoimmune inflammation, refers to precancerous changes and increases the risk of adenocarcinoma development; prolonged hypo- and achlorhydria are associated with an increase in the level of gastrin in the blood serum, a hormone that stimulates proliferation and hyperplasia of ECL cells, which in turn can contribute to the development of NETs of the gastric mucosa.