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Treatment of gastric carcinoids

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Gastric carcinoid tumors are uncommon, but their percentage among all gastric malignancies has increased to 1.8%. Although they are most often discovered incidentally during endoscopy, gastric carcinoids can present with abdominal pain, bleeding, or symptoms related to the secretion of bioactive substances, most commonly histamine. Gastric carcinoids originate from the foregut and are derived from histamine-containing enterochromaffin-like (ECL) cells. Type I gastric carcinoid, the most common, exhibits slow growth and benign behavior. It occurs within the setting of chronic atrophic gastritis with achlorhydria-induced hypergastrinemia. Gastrin acts directly on ECL cells to induce hyperplasia, dysplasia, and, eventually, neoplasia. Type II gastric carcinoid, the least common type, occurs in patients with gastrinoma-associated multiple endocrine neoplasia syndrome-type 1 (MEN-1). The overall survival is related more to the underlying MEN-1 syndrome than to the gastric carcinoid. Rodents readily develop gastric carcinoid tumors in response to hypergastrinemia. However, in humans, other factors in addition to hypergastrinemia, such as pernicious anemia or MEN-1, must be present, implying that a genetic predisposition is necessary for the development of these tumors. Type III or sporadic gastric carcinoids exhibit a more malignant behavior, with overall 5-year survival rates of less than 50% and normal serum gastrin concentrations. Treatment of all types of gastric carcinoids is predicated upon accurate classification and staging. Radiolabeled somatostatin analogues are superior to conventional radiologic imaging techniques in detecting both primary and metastatic lesions. Treatment of choice for localized disease is excision, either endoscopically or surgically. Antrectomy, by eliminating the trophic effect of gastrin, can be useful for select type I carcinoids. Long-acting somatostatin analogues are excellent palliative agents.

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Correspondence to Mitchell L. Schubert.

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Hou, W., Schubert, M.L. Treatment of gastric carcinoids. Curr Treat Options Gastro 10, 123–133 (2007). https://doi.org/10.1007/s11938-007-0064-5

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