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Most HpNGNs exhibit the gastric immunophenotype and a low malignant potential regardless of histological type. Especially, foveolar\u2010type gastric adenoma (FGA) and intestinal\u2010type gastric dysplasia (IGD) rarely progress to invasive carcinoma. FGA is a foveolar epithelial neoplasm that occurs in the fundic gland (oxyntic gland) mucosa and is classified as the flat type or raspberry type (FGA\u2010RA). The flat type is a large, whitish flatly elevated lesion while FGA\u2010RA is a small reddish polyp. Genomically, the flat type is characterized by <jats:italic>APC<\/jats:italic> and <jats:italic>KRAS<\/jats:italic> gene mutations and FGA\u2010RA by a common single nucleotide variant in the <jats:italic>KLF4<\/jats:italic> gene. This <jats:italic>KLF4<\/jats:italic> single\u2010nucleotide variant reportedly induces gastric foveolar epithelial tumorigenesis and activates both cell proliferation and apoptosis, leading to its slow\u2010growing nature. IGD consists of an intestinalized epithelial dysplasia that develops in the pyloric gland mucosa, characterized as a superficial depressed lesion surrounded by raised mucosa showing a gastritis\u2010like appearance. Immunohistochemically, it exhibits an intestinal or gastrointestinal phenotype and, frequently, p53 overexpression. 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