5. Patients with one sentinel lymph node metastasis 0.2-2 mm in size were not required to undergo completion axillary dissection unless only 1 sentinel lymph node was examined. This completion axillary dissection was optional if 1 out of 2 or more sentinel lymph nodes was positive for a micrometastasis. Therefore if 1 of 1 sentinel lymph node was positive for micrometastasis(0.2-2 mm), then a completion axillary dissection was required.