Neoplasm MicrometastasisNeoplasms, Multiple PrimaryNeoplasms, Second PrimaryBrain NeoplasmsBone Marrow NeoplasmsNeoplasms, Unknown PrimarySentinel Lymph Node BiopsyLymphatic MetastasisKeratinsLymph NodesKeratin-20Frozen SectionsHematoxylinNeoplasm StagingMammaglobin BNeoplasm MetastasisKeratin-19ImmunohistochemistryBreast NeoplasmsStomach NeoplasmsPrognosisLung NeoplasmsReverse Transcriptase Polymerase Chain ReactionNeoplasm InvasivenessNeoplastic Cells, CirculatingAxilla