HDAC7 and chronic gastritis: The down-regulation of NDUFS8 (NADH: Ubiquinone Oxidoreductase Core Subunit S8), MT2A (Metallothionein 2A), HDAC7 = Histone Deacetylase 7, and PDK1 (Pyruvate dehydrogenase kinase 1) in chronic gastritis and intestinal metaplasia, respectively, was also confirmed (Figure S3).