Neoplasm MicrometastasisLymph NodesBone Marrow NeoplasmsSentinel Lymph Node BiopsyLymphatic MetastasisKeratinsLymph Node ExcisionKeratin-20Frozen SectionsNeoplasm StagingHematoxylinImmunohistochemistryNeoplasm MetastasisBreast NeoplasmsMammaglobin BKeratin-19PrognosisStomach NeoplasmsAxillaLung NeoplasmsNeoplasm InvasivenessReverse Transcriptase Polymerase Chain ReactionNeoplastic Cells, CirculatingTumor Markers, BiologicalSensitivity and Specificity