Neoplasm MicrometastasisCarcinomaBone Marrow NeoplasmsLymphatic MetastasisSentinel Lymph Node BiopsyCarcinoma, Squamous CellKeratinsCarcinoma, HepatocellularLymph NodesImmunohistochemistryNeoplasm StagingKeratin-20Liver NeoplasmsBreast NeoplasmsFrozen SectionsNeoplasm MetastasisPrognosisNeoplasm InvasivenessCarcinoma in SituLung NeoplasmsHematoxylinStomach NeoplasmsCarcinoma, PapillaryTumor Markers, BiologicalKeratin-19Mammaglobin BReverse Transcriptase Polymerase Chain ReactionAdenocarcinomaPancreatic NeoplasmsNeoplastic Cells, CirculatingCarcinoma, Basal CellMice, NudeAxillaCarcinoma, Ductal, BreastBile Duct NeoplasmsSurvival AnalysisSensitivity and SpecificityCarcinoembryonic AntigenThyroid NeoplasmsColorectal NeoplasmsRetrospective StudiesNeoplasm Recurrence, LocalLymph Node ExcisionTumor Cells, CulturedNeoplasmsNeoplasm TransplantationSkin Neoplasms