Type 1: Type 1 tumours (approximately 80% of total) are usually sessile polyps and associated with (usually autoimmune) atrophic gastritis, pernicious anaemia, achlorhydria and hypergastrinaemia, with the elevated gastrin being produced by gastric antral G cells. Type 2 gastric NETs (approximately 5% of total) occur in patients with Zollinger Ellison syndrome, usually in the setting ..
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