EsophagectomyGastrointestinal NeoplasmsEsophagusEsophageal NeoplasmsBarrett EsophagusEndoscopyEndoscopy, GastrointestinalCapsule EndoscopyStomach NeoplasmsEsophagoscopyAdenocarcinomaEndoscopy, Digestive SystemThoracoscopyEsophageal DiseasesCarcinoma, Squamous CellEsophageal StenosisPancreatic NeoplasmsUpper Gastrointestinal TractDigestive System NeoplasmsEsophagostomyColorectal NeoplasmsEsophagogastric JunctionTreatment OutcomeAnastomosis, SurgicalEsophagoplastyRetrospective StudiesColonic NeoplasmsNeoplasm StagingGastric FistulaPrecancerous ConditionsGastroscopyCombined Modality TherapyEsophageal FistulaGastroesophageal RefluxMetaplasiaPrognosisSurvival RatePostoperative ComplicationsCardiaProspective StudiesFluorouracilThoracotomyCarcinomaStomachCongresses as TopicRectal NeoplasmsFollow-Up StudiesHernia, HiatalAnastomotic LeakEsophageal AchalasiaRisk FactorsGastrointestinal DiseasesEndoscopes, GastrointestinalNeoplasmsDihydrouracil Dehydrogenase (NADP)Antineoplastic Combined Chemotherapy ProtocolsLymph Node ExcisionAppetite StimulantsSurvival AnalysisEarly Detection of CancerGastrointestinal HemorrhageLaparoscopyAntigens, Tumor-Associated, CarbohydrateEsophagitisTumor Markers, BiologicalLyeGene Expression Regulation, NeoplasticMucous MembraneEndoscopesIntestinal NeoplasmsJejunostomyGastrostomyThoracoscopesNeoplasm MetastasisRationalizationDuodenoscopesEnteral NutritionCell Line, TumorGastrectomyDeglutition DisordersIranAntineoplastic AgentsBiopsyLung NeoplasmsMedical OncologyAsbestosGastric MucosaCarcinoembryonic AntigenIncidenceCachexiaTime FactorsChemotherapy, AdjuvantColonoscopyEsophagitis, PepticNeoplasm ProteinsSurgical StaplingSensitivity and SpecificityCapsule EndoscopesDisease ProgressionTracheoesophageal Fistula