Multiple retrospective reports have verified the overall utility of post-treatment sentinel lymph node (SLN) mapping and biopsy for assessing the final axillary lymph node status in breast cancer patients who have undergone preoperative neoadjuvant systemic chemotherapy. However, to date, only one report, in abstract form, currently exists within the literature which specifically assesses the utility of post-treatment SLN mapping and biopsy after completion of preoperative neoadjuvant systemic chemotherapy in patients with biopsy-proven positive axillary lymph nodes at initial presentation.