Adenocarcinoma, MucinousAdenocarcinomaAppendiceal NeoplasmsStomach NeoplasmsCarcinoma, Signet Ring CellPseudomyxoma PeritoneiRectal FistulaMetaplasiaCecal NeoplasmsCystadenoma, MucinousMucinsUrachal CystCalymmatobacteriumPerineumCystadenocarcinoma, MucinousImmunohistochemistryMucin-2Neoplasm StagingTumor Markers, BiologicalGastric MucosaGastritis, AtrophicColorectal NeoplasmsPrecancerous ConditionsSodium-Phosphate Cotransporter Proteins, Type IIbOvarian NeoplasmsGastritisPrognosisIntestinal NeoplasmsGastrectomyColonic NeoplasmsRectal NeoplasmsMicrosatellite InstabilityHelicobacter pyloriHelicobacter InfectionsCarcinomaIntestinesLymphatic MetastasisKaplan-Meier EstimateLung NeoplasmsNeoplasm InvasivenessPancreatic NeoplasmsEsophageal NeoplasmsAdenocarcinoma, PapillaryBarrett EsophagusCarcinoma, Pancreatic DuctalAdenocarcinoma, Bronchiolo-AlveolarRetrospective Studies