Colorectal NeoplasmsColonoscopyAdenomaColonic PolypsPneumoradiographyAdenocarcinomaRectumRectal NeoplasmsIntestinal MucosaColonic NeoplasmsColonEarly Detection of CancerTumor Markers, BiologicalNeoplasm StagingImmunohistochemistryNeoplasm InvasivenessRetrospective StudiesColorectal Neoplasms, Hereditary NonpolyposisRisk FactorsSensitivity and SpecificityPrognosisPilot ProjectsColorectal SurgeryNeoplasmsPancreatic NeoplasmsLiver NeoplasmsNeoplasms, Cystic, Mucinous, and SerousSigmoidoscopyDNA, NeoplasmAdenomatous PolypsNeoplasms, Multiple PrimaryAdenocarcinoma, MucinousCarcinomaFluorouracilNeoplasm MetastasisNeoplasm ProteinsSkin NeoplasmsIntestinal PolypsAdenomatous Polyposis ColiOrganoplatinum CompoundsGene Expression Regulation, NeoplasticCarcinoembryonic AntigenLeucovorinNeoplasms, Second Primary