MetaplasiaBarrett EsophagusGastric MucosaPrecancerous ConditionsGastritisGastritis, AtrophicStomach NeoplasmsCardiaHelicobacter pyloriHelicobacter InfectionsStomachIntestinesGastroscopyEsophagusEsophagogastric JunctionEsophagoscopyMucin-2Mucin-6Pyloric AntrumGap JunctionsBiopsyKeratin-7Intercellular JunctionsMucinsTight JunctionsAdenocarcinomaGastroesophageal RefluxStomach UlcerMucous MembraneStomach DiseasesKeratin-20Endoscopy, GastrointestinalEsophageal NeoplasmsMucin 5ACGoblet CellsBile RefluxIntestinal NeoplasmsImmunohistochemistryAdherens JunctionsNeuromuscular JunctionPepsinogen AAtrophyDyspepsiaPepsinogensGastric FundusIntestinal MucosaDuodenal UlcerHomeodomain ProteinsPacific StatesEndoscopyChief Cells, GastricIntestinal DiseasesEsophageal DiseasesEsophagitisPepsinogen CCell Transformation, NeoplasticDisease ProgressionEpitheliumGastric JuiceCystitisEndoscopy, Digestive SystemChronic DiseaseTumor Markers, BiologicalConnexinsPrimary MyelofibrosisHistocytochemistryPortugalGastrinsColombiaRisk FactorsMucin-1Connexin 43Hernia, HiatalNarrow Band ImagingEpithelial CellsCadherinsGastrointestinal NeoplasmsManometryPeptic UlcerKeratinsZonula Occludens-1 ProteinFollow-Up StudiesStaining and LabelingKi-67 AntigenOccludinImmunoenzyme TechniquesDuodenitisProspective StudiesGerbillinaeMethylene BlueSucraseLouisianaTumor Suppressor Protein p53OmeprazoleCarcinomaOssification, HeterotopicGastrectomy