Neoplasm MicrometastasisLymphatic MetastasisLymph NodesSentinel Lymph Node BiopsyBone Marrow NeoplasmsLymph Node ExcisionLymphKeratinsAxillaNeoplasm StagingNeoplasm MetastasisBreast NeoplasmsPrognosisImmunohistochemistryMorbidityKeratin-20HematoxylinFrozen SectionsMammaglobin BNeoplastic Cells, CirculatingStomach NeoplasmsNeoplasm InvasivenessSensitivity and SpecificityLung NeoplasmsReverse Transcriptase Polymerase Chain ReactionTumor Markers, BiologicalCarcinoembryonic AntigenCarcinomaMelanomaColorectal NeoplasmsAdenocarcinomaKeratin-19Retrospective StudiesLiver NeoplasmsSurvival AnalysisSkin NeoplasmsSurvival RateNeoplasm Recurrence, LocalPredictive Value of TestsMice, NudeBone MarrowFollow-Up StudiesNeoplasm TransplantationPancreatic Neoplasms