A well differentiated neuroendocrine tumor that arises from the stomach. It produces gastrin and it may be associated with Zollinger-Ellison syndrome. The disease is Monarch Disease Ontology term MONDO_0003524 (gastric gastrin-producing neuroendocrine tumor). Also known as: gastric G-cell gastrin producing tumor, gastric G-cell gastrin producing tumour, gastric gastrin producing tumor, gastric gastrin producing tumour, gastric gastrin-producing NET, gastrin producing neuroendocrine tumor of the stomach, gastrin producing neuroendocrine tumour of the stomach, gastrin producing tumor of the stomach.