Carcinoma, Signet Ring CellMucinsAdenocarcinoma, MucinousStomach NeoplasmsAppendiceal NeoplasmsUmbilicusCarcinomaMicrosatellite InstabilityImmunohistochemistryAdenocarcinomaGastrectomyRare DiseasesCell Line, TumorGastric MucinsProto-Oncogene Proteins B-rafPeritoneal NeoplasmsCadherinsNeoplasm StagingCarcinoma, Squamous CellPyloric AntrumColorectal NeoplasmsEndoscopy, GastrointestinalLoss of HeterozygosityCarcinoma, Hepatocellularras ProteinsHistocytochemistryNeoplasm InvasivenessTumor Cells, CulturedPrognosisAlcian BlueTumor Markers, BiologicalMicrosatellite RepeatsMutationSurvival Analysis