4.4.1　Indication

Clinical lymediatic breast cancer（the size of the primary breast tumor is not limited），clinical armpit lymph node negative，single or multicenter lesions，age and gender is not limited，catheter in situ cancer received mastectomy and clinical armpit lymph node negative new auxiliary treatment.Clinical physical examination and imaging examination of suspicious armpit lymph nodes can be evaluated by ultrasound-guided fine needle punctures or empty core needle biopsies，and cytological or histopathologically negative patients can still enter the SLNB process.(https://www.daowen.com)