Adenomatous PolypsColonic PolypsPolypsAdenomatous Polyposis ColiIntestinal PolypsAdenomaColonoscopyAdenomatous Polyposis Coli ProteinColorectal NeoplasmsColonic NeoplasmsNasal PolypsSigmoidoscopyDietary SupplementsColonography, Computed TomographicColonIntestinal MucosaHyperplasiaRectal NeoplasmsRectumBarium SulfateGardner SyndromeCecal NeoplasmsEnemaPrecancerous ConditionsGenes, APCSulindacRectal DiseasesAdenocarcinomaSigmoid NeoplasmsCystadenomaOccult BloodDiverticulum, ColonColon, TransverseGerm-Line MutationCase-Control StudiesAnti-Inflammatory Agents, Non-Steroidalbeta CateninDietEndoscopyRisk FactorsMutationFibromatosis, AggressiveDuodenal NeoplasmsBiopsyFood, FortifiedImmunohistochemistryDouble-Blind MethodMass ScreeningCarcinomaCytoskeletal ProteinsVegetablesIntestinal NeoplasmsFruitAnimal FeedRetrospective StudiesAdenomatosis, PulmonaryVitamins