CpG IslandsMicrosatellite InstabilityCyclic IMPDNA MethylationProto-Oncogene Proteins B-rafColorectal NeoplasmsPhenotyperas ProteinsLong Interspersed Nucleotide ElementsEpigenesis, GeneticCore Binding Factor Alpha 3 SubunitColonic NeoplasmsGenes, NeoplasmDNA Modification MethylasesMutationMicrosatellite RepeatsChromosomal InstabilityGenes, p16Promoter Regions, GeneticGene Expression Regulation, NeoplasticAdaptor Proteins, Signal TransducingProto-Oncogene ProteinsDNA, NeoplasmRectal NeoplasmsAdenomaPrognosisGene SilencingDNA Repair EnzymesGenes, rasCyclin-Dependent Kinase Inhibitor p16Loss of HeterozygosityNuclear ProteinsCarcinomaTumor Markers, BiologicalCohort StudiesPolymerase Chain ReactionNeoplasm ProteinsProspective StudiesGenetic MarkersKaplan-Meier EstimateAdenocarcinomaGenetic Predisposition to DiseaseImmunohistochemistryStomach NeoplasmsDNA Mutational AnalysisNeoplasm StagingTumor Suppressor Protein p53GenotypeSurvival RateCase-Control StudiesReverse Transcriptase Polymerase Chain ReactionProportional Hazards ModelsRisk Factors