Barrett EsophagusEsophagusEsophageal NeoplasmsMetaplasiaPrecancerous ConditionsAdenocarcinomaGenes, MCCCardiaGastroesophageal RefluxEndoscopy, GastrointestinalEsophagoscopyDisease ProgressionImmunohistochemistryEsophagogastric JunctionEsophagectomyMucous MembraneHernia, HiatalStomach NeoplasmsEsophageal DiseasesPharmacy AdministrationEarly Detection of CancerEsophageal StenosisEndoscopyTumor Markers, BiologicalBiopsyGene Expression Regulation, NeoplasticCarcinoma, Squamous CellPrognosis