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Gastric Neuroendocrine Tumors Associated with Proton Pump Dysfunction Junji Umeno 1 , Yutaro Ihara 1,2 , Yoshifumi Hori 1,3 , Yoshiaki Taniguchi 1,4 , Shinichiro Kawatoko 1 , Minako Fujiwara 5 , Keisuke Kawasaki 1 , Takehiro Torisu 1 , Motohiro Esaki 6 , Takanari Kitazono 1 1Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan 2Department of Gastroenterology, Onga Nakama Medical Association, Onga Hospital, Fukuoka, Japan 3Department of Gastroenterology, Shimonoseki City Hospital, Shimonoseki, Japan 4Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan 5Department of Pathology, National Hospital Organization Kyushu Medical Center, Fukuoka, Japan 6Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, Saga University, Saga, Japan Keyword: 胃カルチノイド , ガストリン , ATP4A遺伝子 , プロトンポンプ , 胃壁細胞 pp.1649-1658
Published Date 2023/12/25
DOI https://doi.org/10.11477/mf.1403203432

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 Gastric NET(neuroendocrine tumor)is categorized into types 1 to 3 based on the developmental environment. A case of type 4 gastric NET with parietal cell dysfunction, which is different from any of the subtypes, has been recently reported. This study aimed to clarify the clinical characteristics of type 4 gastric NET. We compared clinical background, imaging findings, blood sampling data, and histopathological results of endoscopically treated specimens of one case of type 4 gastric NET and 13 cases of type 1 gastric NET in Kyushu University Hospital. A compound heterozygous mutation in the ATP4A gene was identified in the patient with type 4 gastric NET. Approximately 10 erythematous submucosal tumor-like raised lesions were observed in the fundic gland region in type 4 gastric NET. The background mucosa was thickened, different from type A gastritis. A comparison of clinical characteristics with type 1 gastric NETs revealed similar age at onset and serum gastrin levels, but with negative antiparietal cell antibody and intrinsic factor antibody, and normal mean corpuscular volume and serum vitamin B12. Gastric NET type 4 is a novel disease entity that is an inherited disorder caused by a proton pump dysfunction.


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