Neoplasm MicrometastasisLymph NodesBone Marrow NeoplasmsSentinel Lymph Node BiopsyLymphatic MetastasisKeratinsLymph Node ExcisionKeratin-20Frozen SectionsNeoplasm StagingHematoxylinImmunohistochemistryNeoplasm MetastasisMammaglobin BBreast NeoplasmsKeratin-19AxillaPrognosisStomach NeoplasmsNeoplasm InvasivenessLung NeoplasmsReverse Transcriptase Polymerase Chain ReactionNeoplastic Cells, CirculatingTumor Markers, Biological