Gastrointestinal NeoplasmsUpper Gastrointestinal TractStomach NeoplasmsEsophageal NeoplasmsGastrointestinal TractPancreatic NeoplasmsDigestive SystemAdenocarcinomaColorectal NeoplasmsGastrointestinal DiseasesEndoscopy, GastrointestinalGastrointestinal HemorrhageNeoplasm MetastasisFluorouracilLiver NeoplasmsDuodenitisEsophageal DiseasesCausticsStomachEndoscopyColonic NeoplasmsGastroscopyDuodenumBurns, ChemicalDuodenoscopyStomach DiseasesEndoscopes, GastrointestinalTreatment OutcomePeptic UlcerLymphatic MetastasisEsophagoscopyEsophagusGastric MucosaDuodenal NeoplasmsGastrointestinal MotilityEndoscopy, Digestive SystemEsophagitisDigestive System Surgical ProceduresIleostomyStomach UlcerDyspepsiaGastritisIntestinal MucosaDigestive System Physiological PhenomenaGastric JuiceNeoplasms, Multiple PrimaryIntestine, SmallIleumMucous MembraneRetrospective StudiesBarrett EsophagusAdministration, OralBiopsyLung NeoplasmsGastroesophageal RefluxHelicobacter InfectionsAnti-Inflammatory Agents, Non-SteroidalHelicobacter pyloriLower Gastrointestinal TractProspective StudiesNeoplasm InvasivenessTime FactorsCell Line, TumorImmunohistochemistryPrognosisBreast NeoplasmsNeoplasmsPostoperative ComplicationsRisk FactorsUpper ExtremityMelanomaUrinary Tract InfectionsTumor Markers, BiologicalIntestinesHematologic NeoplasmsTomography, X-Ray ComputedNeoplasm StagingGene Expression Regulation, NeoplasticColon