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Clinicopathological features and genetics analysis of gastric adenocarcinoma from the fundic gland |
ZHANG Xiaohong1 WANG Yu’e2 YANG Jing2 WANG Ye3 LIU Xiaojiang1 WANG Zhihui1 YAO Shaobo1 |
1.Department of Pathology, Linyi Tumor Hospital, Shandong Province, Linyi 276000, China;
2.Department of Endoscopy Center, Linyi Tumor Hospital, Shandong Province, Linyi 276000, China;
3.Department of Pathology, Linyi Traditional Chinese Medicine Hospital, Shandong Province, Linyi 276000, China
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Abstract Objective To investigate the clinicopathological features and genetic characteristics of gastric adenocarcinoma from the fundic gland. Methods From January 2017 to March 2022, seven cases in Linyi Tumor Hospital and two cases in Linyi Traditional Chinese Medicine Hospital of Shandong Province with adenocarcinoma from fundus gland were collected. The clinicopathological features were analyzed retrospectively, and immunohistochemical staining and next generation sequencing (NGS) were detected. Results Eight cases were diagnosed as gastric adenocarcinoma of fundus gland type (GA-FG), with the surface of the lesions covered by normal concave epithelium and low grade dysplasia below. One case was diagnosed as gastric adenocarcinoma of fundic gland mucosa type (GA-FGM) with mucosal structure disorder, neoplastic concave epithelium, and low-grade dysglandular mixed hyperplasia. No atrophy, intestinal metaplasia, and Helicobacter pylori infection were observed in the surrounding mucosa of seven GA-FG and one GA-FGM cases. Immunohistochemical staining showed that mucin (MUC) 6, pepsinogenⅠ, and H+/K+-adenosine triphosphatase (ATPase) were expressed in all the eight GA-FG cases, while MUC5AC was only expressed in normal concave epithelium. The tumor cells of one GA-FGM case expressed MUC6, MUC5AC, pepsinogenⅠand H+/K+-ATPase. The results of NGS detection showed that two GA-FG cases had GNAS missense mutations, and one GA-FGM case had BRAF and TP53 missense mutations. Conclusion GA-FG is a rare low-grade malignant tumor, which often infiltrates submucosa, but has a good prognosis in most cases, while GA-FGM has different clinicopathological characteristics and a slightly worse prognosis.
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