The patients undergoing axillary lymph node dissection were randomized into 3 groups: patients undergoing lavages with normal saline (Group 1), patients undergoing lavage gentamicin solution (Group 2) and patients undergoing lavage with a clindamycin solution (Group 3). Drainage volume discharge is investigated

The patients undergoing axillary lymph node dissection were randomized into 3 groups: patients undergoing 2 lavages with 500 ml normal saline (Group 1), patients first undergoing lavage with 500 ml normal saline followed by a second lavage with a 500 ml of a gentamicin (240 mg) solution (Group 2) and patients first undergoing lavage with 500 ml normal saline followed by a second lavage with 500ml of a clindamycin (600mg) solution (Group 3). Drainage volume discharge is investigated

Inclusion Criteria:

• diagnosis of breast neoplasms
• plans to undergo an elective ALND of Berg's levels I and II due to axillary metastasis determined preoperatively by core biopsy or evidence of metastasis in the SLNB in the intraoperative or in the differed analysis.

Exclusion Criteria:

• allergy to any of the antibiotic drugs used
• chronic renal failure due to possible toxicity of gentamicin
• patients undergoing a modified radical mastectomy.