Carcinoma, Signet Ring CellAdenocarcinomaAdenocarcinoma, MucinousStomach NeoplasmsAppendiceal NeoplasmsUmbilicusCarcinomaMicrosatellite InstabilityImmunohistochemistryGastrectomyRare DiseasesMucinsProto-Oncogene Proteins B-rafCadherinsPeritoneal NeoplasmsNeoplasm StagingColorectal NeoplasmsCarcinoma, Squamous CellEndoscopy, GastrointestinalPyloric Antrumras ProteinsLoss of HeterozygosityPrognosisNeoplasm InvasivenessHistocytochemistryCarcinoma, HepatocellularMicrosatellite RepeatsAlcian BlueSurvival Analysis