gastric adenocarcinoma and proximal polyposis of the stomach (MONDO_0017790) is an autosomal dominant disorder caused by specific pathogenic variants in the APC gene promoter, characterized by proximal gastric polyposis and an increased risk of gastric adenocarcinoma. Also known as: APC-related gastric adenocarcinoma and proximal polyposis of the stomach, GAPPS, familial fundic gland polyposis with gastric cancer, fundic gland polyposis, polyposis, gastric, polyposis, gastric, Dos Santos and de Magalhaes 1980.