Polymorphism, GeneticPolymorphism, Single NucleotideGenotypeGenetic Predisposition to DiseaseGene FrequencyAllelesCatechol O-MethyltransferaseCase-Control StudiesHaplotypesSerotonin Plasma Membrane Transport ProteinsGenetic Association StudiesLinkage DisequilibriumAsian Continental Ancestry GroupPromoter Regions, GeneticMonoamine OxidaseGenetic VariationPolymerase Chain ReactionEuropean Continental Ancestry GroupHomozygoteMethylenetetrahydrofolate Reductase (NADPH2)Risk FactorsChinaGlutathione S-Transferase piPhenotypeOdds RatioBase SequenceSequence Analysis, DNAValineHeterozygote5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseMinisatellite RepeatsMolecular Sequence DataGenetic MarkersHashimoto DiseaseAmino Acid SubstitutionPolymorphism, Single-Stranded ConformationalGlutathione TransferaseRiskDNA Mutational AnalysisDNA PrimersEpistasis, GeneticProtein Tyrosine Phosphatase, Non-Receptor Type 22Aryl Hydrocarbon HydroxylasesGlucuronosyltransferaseJapanCohort StudiesXeroderma Pigmentosum Group D ProteinExonsPolymorphism, Restriction Fragment LengthGenetics, PopulationGenome-Wide Association StudyGenetic LinkageMutationGenetic TestingSmoking3' Untranslated RegionsFolic AcidGene-Environment InteractionModels, GeneticAfrican AmericansChromosome MappingLogistic ModelsSchizophreniaReceptors, Dopamine D2DNABreast NeoplasmsSelection, GeneticQuantitative Trait LociAge of OnsetMethionineMembrane Transport ProteinsProto-Oncogene Proteins c-mdm2Disease SusceptibilityAlcoholismDopamine Plasma Membrane Transport ProteinsChi-Square DistributionPoint MutationReference ValuesAmplified Fragment Length Polymorphism AnalysisLung NeoplasmsPrognosisColorectal NeoplasmsCarrier ProteinsEsophageal NeoplasmsCytochrome P-450 Enzyme SystemRNA, MessengerLupus Erythematosus, SystemicElectrophoretic Mobility Shift AssayFas Ligand ProteinBrain-Derived Neurotrophic FactorConfidence IntervalsGene Expression RegulationStomach NeoplasmsSex FactorsTranscription, GeneticCarcinoma, Squamous CellAnalysis of VarianceMicrosatellite RepeatsMatrix Metalloproteinase 9Prospective Studies