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Objective The involvement of axillary lymph node is one of the most influential prognostic factors in breast cancer patients.According to the results of American College of Surgeons Oncology Group(ACOSOG)Z0011 and After Mapping of the Axilla:Radiotherapy or Surgery(AMAROS)trials,excellent axillary regional control has been achieved for selected breast cancer patients with metastatic sentinel lymph nodes(SLN)who did not receive complete axillary lymph node dissection.