Carcinoma, Signet Ring CellAdenocarcinoma, MucinousCell Line, TumorStomach NeoplasmsCarcinoma, Squamous CellTumor Cells, CulturedAppendiceal NeoplasmsNeoplasmsUmbilicusCarcinoma, Renal CellCarcinomaImmunohistochemistryAdenocarcinomaMicrosatellite InstabilityCarcinoma, Basal CellGastrectomyRare DiseasesNeoplasm StagingMucinsCadherinsProto-Oncogene Proteins B-rafPeritoneal NeoplasmsKidney NeoplasmsPrognosisNeoplasm InvasivenessTumor Markers, BiologicalLoss of HeterozygosityColorectal NeoplasmsCarcinoma, HepatocellularPyloric AntrumEndoscopy, Gastrointestinalras ProteinsHistocytochemistryCarcinoma, Transitional CellSkin NeoplasmsHead and Neck NeoplasmsSurvival AnalysisMicrosatellite RepeatsMutationMouth NeoplasmsCarcinoma, Merkel CellAlcian BlueNeoplasm MetastasisLiver NeoplasmsColonic NeoplasmsCarcinoma, Small Cell