Gastric MucosaStomach NeoplasmsMetaplasiaGastritisStomach DiseasesPrecancerous ConditionsHelicobacter pyloriHelicobacter InfectionsAdenocarcinomaStomachImmunohistochemistryGene Expression Regulation, NeoplasticIntestinal MucosaBiopsyStomach UlcerDNA MethylationCarcinomaRNA, MessengerTumor Markers, BiologicalLymphatic MetastasisMouth MucosaGastric JuiceParietal Cells, GastricNasal MucosaPrognosisGastric AcidPyloric AntrumChoristomaGastritis, AtrophicGastrinsGastric MucinsPepsinogensAnti-Ulcer AgentsH(+)-K(+)-Exchanging ATPaseGastroscopyHelicobacterHydrochloric AcidMucous MembraneGastric FundusPentagastrinDuodenumMeckel DiverticulumHistamineEthanolRe-EpithelializationCathepsin EUreaseIndomethacinMucusCimetidineRats, WistarPeptic Ulcer16,16-Dimethylprostaglandin E2Pepsin ABile RefluxColonDuodenal UlcerTetragastrinMetiamideMucinsOlfactory MucosaDinoprostoneProstaglandins E, SyntheticHelicobacter heilmanniiPylorusChief Cells, GastricAnti-Inflammatory Agents, Non-Steroidal