CpG IslandsMicrosatellite InstabilityDNA MethylationProto-Oncogene Proteins B-rafColorectal NeoplasmsPhenotypeLong Interspersed Nucleotide Elementsras ProteinsGenes, p16Microsatellite RepeatsEpigenesis, GeneticDNA, NeoplasmChromosomal InstabilityAdaptor Proteins, Signal TransducingGene Expression Regulation, NeoplasticColonic NeoplasmsMutationSulfitesPromoter Regions, GeneticDNA Modification MethylasesGene SilencingGenes, NeoplasmEpigenomicsPrognosisDNA (Cytosine-5-)-MethyltransferaseProto-Oncogene ProteinsTumor Markers, BiologicalAdenomaNuclear ProteinsRectal NeoplasmsLoss of HeterozygosityGenes, Tumor SuppressorNeoplasm ProteinsCohort StudiesGenes, p53Polymerase Chain ReactionKaplan-Meier EstimateCarcinomaTumor Suppressor Protein p53Stomach NeoplasmsAdenocarcinomaNeoplasm StagingImmunohistochemistryCarrier ProteinsProspective Studies