Adenomatous PolypsColonic PolypsPolypsAdenomatous Polyposis ColiIntestinal PolypsAdenomaColonoscopyAdenomatous Polyposis Coli ProteinColorectal NeoplasmsColonic NeoplasmsNasal PolypsSigmoidoscopyColonography, Computed TomographicColonHyperplasiaRectal NeoplasmsIntestinal MucosaRectumBarium SulfateGardner SyndromeCecal NeoplasmsEnemaGenes, APCPrecancerous ConditionsSulindacRectal DiseasesSigmoid NeoplasmsAdenocarcinomaCystadenomaOccult BloodDiverticulum, ColonColon, TransverseGerm-Line Mutationbeta CateninAnti-Inflammatory Agents, Non-SteroidalCase-Control StudiesEndoscopyFibromatosis, AggressiveRisk FactorsMutationDuodenal NeoplasmsBiopsyMass ScreeningImmunohistochemistryCytoskeletal ProteinsCarcinomaIntestinal NeoplasmsVegetablesAdenomatosis, PulmonaryRetrospective Studies