Adenomatous PolypsColonic PolypsPolypsAdenomaIntestinal PolypsAdenomatous Polyposis ColiColonoscopyColorectal NeoplasmsColonography, Computed TomographicNasal PolypsAdenomatous Polyposis Coli ProteinRectal DiseasesColonic NeoplasmsSigmoidoscopyRectal NeoplasmsRectumHyperplasiaColonIntestinal MucosaPrecancerous ConditionsProctoscopesGenes, APCColonoscopesCase-Control StudiesAdenocarcinomaAdenoma, VillousMucin-6Barium SulfateEnemaNarrow Band ImagingCecal NeoplasmsGardner SyndromeRisk FactorsPhenolphthaleinAnti-Inflammatory Agents, Non-SteroidalColonic DiseasesAdenoma, PleomorphicImmunohistochemistrySigmoid NeoplasmsSulindacTumor Markers, BiologicalGerm-Line Mutationbeta CateninEndoscopy, GastrointestinalCystadenomaRetrospective StudiesCarcinomaOccult BloodPituitary NeoplasmsDiverticulum, ColonEndoscopyMass ScreeningMutationAdrenocortical AdenomaDietIntestinal NeoplasmsDuodenal NeoplasmsColon, TransversePrognosisColorectal Neoplasms, Hereditary NonpolyposisAdenoma, Liver CellNeoplasm Recurrence, LocalGenotypeBiopsyProspective StudiesPolyphosphatesIntestinal PolyposisCytoskeletal ProteinsObserver VariationColorectal SurgerySensitivity and SpecificityPolymorphism, GeneticAdenoma, ChromophobeFibromatosis, AggressiveDisease ProgressionVegetablesPeutz-Jeghers SyndromeFollow-Up StudiesNeoplasms, Multiple Primary