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This study aimed to evaluate the prognosis of breast cancer patients who received neoadjuvant chemotherapy and underwent sentinel lymph node biopsy (SLN alone as axillary surgery regardless of their clinical and pathological lymph node status. We reviewed the records of 1,795 patients from Asan Medical Center who were diagnosed with stage I-III breast cancer and received neoadjuvant chemotherapy during 2003-2014. We selected 760 patients who underwent SLNB alone as axillary surgery and divided these patients into four groups according to