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Gastrointestinal NeoplasmsStomach NeoplasmsPancreatic NeoplasmsEsophageal NeoplasmsDigestive System NeoplasmsColorectal NeoplasmsAdenocarcinomaColonic NeoplasmsUpper Gastrointestinal TractCongresses as TopicRectal NeoplasmsNeoplasmsDihydrouracil Dehydrogenase (NADP)Appetite StimulantsAntigens, Tumor-Associated, CarbohydratePrognosisTumor Markers, BiologicalSensitivity and SpecificityNeoplasm MetastasisEarly Detection of CancerFluorouracilGene Expression Regulation, NeoplasticRationalizationRetrospective StudiesAntineoplastic Combined Chemotherapy ProtocolsCell Line, TumorCombined Modality TherapyRisk FactorsAntineoplastic AgentsLung NeoplasmsProspective StudiesMedical OncologyNeoplasm StagingCarcinoembryonic AntigenAsbestosIranCarcinomaCachexiaIntestinal NeoplasmsFollow-Up StudiesNeoplasm ProteinsGenetic Predisposition to DiseaseTreatment OutcomeCarcinoma, Squamous CellHuman DevelopmentMutationSurvival RateNeoplasm SeedingDeoxycytidineIncidencePolymerase Chain ReactionFrameshift MutationSurvival AnalysisThymidine PhosphorylaseMice, NudeDelayed DiagnosisDisease ProgressionBreast NeoplasmsProstatic NeoplasmsCA-19-9 AntigenLiver NeoplasmsRegistriesDNA, NeoplasmRiskOvarian NeoplasmsAntigens, NeoplasmDNA MethylationGastrinsPredictive Value of TestsEarly DiagnosisReverse Transcriptase Polymerase Chain ReactionPeritoneal NeoplasmsMalnutritionCamptothecinClinical Trials as TopicAntimetabolites, AntineoplasticChinaGastrointestinal DiseasesEnteral NutritionRNA, MessengerAntibodies, MonoclonalMicrosatellite InstabilityMicrosatellite RepeatsCase-Control StudiesImmunohistochemistryPalliative CarePrenatal DiagnosisTime FactorsPrecancerous ConditionsPeutz-Jeghers SyndromeChemotherapy, AdjuvantCohort StudiesNeoplasm InvasivenessPromoter Regions, GeneticQuality of LifeDNA Mutational AnalysisCell ProliferationNutritional StatusApoptosisMitomycin