CpG IslandsDNA MethylationMicrosatellite InstabilityProto-Oncogene Proteins B-rafColorectal NeoplasmsPhenotypeLong Interspersed Nucleotide Elementsras ProteinsEpigenesis, GeneticGenes, p16DNA, NeoplasmPromoter Regions, GeneticMicrosatellite RepeatsGene Expression Regulation, NeoplasticDNA Modification MethylasesGene SilencingMutationColonic NeoplasmsChromosomal InstabilityGenes, NeoplasmAdaptor Proteins, Signal TransducingIslandsPrognosisTumor Markers, BiologicalAdenomaProto-Oncogene ProteinsRectal NeoplasmsPolymerase Chain ReactionLoss of HeterozygosityCohort StudiesNuclear ProteinsGenes, p53Neoplasm ProteinsKaplan-Meier EstimateStomach NeoplasmsSulfitesImmunohistochemistryDinucleoside PhosphatesNeoplasm StagingProspective StudiesDNA (Cytosine-5-)-MethyltransferaseAzacitidineRhode IslandIndian Ocean IslandsEpigenomicsPacific IslandsGenes, Tumor SuppressorBase SequenceGenome, HumanSequence Analysis, DNAMolecular Sequence DataMethylationPrince Edward IslandMediterranean IslandsCytosineTranscription Initiation SiteDeoxyribonuclease HpaII