ERBB2 and neoplasm: No significant difference was found between the two groups concerning the tumor histology, lympho-vascular invasion (LVI), endocrine receptors, Her2 status, tumor phenotypes, number of positive SNs, chemotherapy, surgery, endocrine therapy, radiotherapy (breast or post-mastectomy radiation therapy (PMRT)), clavicular radiation and non-sentinel node (NSN) status at cALND.