Axillary Sentinel Lymph Node Biopsy After Neoadjuvant Chemotherapy in Patients With Initial cN1 Breast Cancer

After the completion of neoadjuvant therapy, axillary SLNB should be performed first before breast surgery; If the frozen pathology SLNs are negative, ALND will no longer be performed; If frozen pathological SLNs are positive, ALND should be performed directly; If frozen pathology is false negative.