• Melissa Pilewskie, Starr Koslow Mautner, Michelle Stempel, Anne Eaton, and Monica Morrow.
• Breast Service, Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
• Ann. Surg. Oncol. 2016 Apr 1; 23 (4): 1123-8.

BackgroundAmerican College of Surgeons Oncology Group (ACOSOG) Z0011 defined clinical node negativity by physical examination alone. Although axillary ultrasound with biopsy has a positive predictive value for lymph node (LN) metastases approaching 100 %, it may not appropriately identify clinically node-negative women with ≥3 positive LNs who require axillary lymph node dissection (ALND). We sought to identify the total number of positive LNs in women presenting with cT1-2N0 breast carcinoma with a positive preoperative LN biopsy to evaluate the potential for overtreatment when ALND is performed on the basis of a positive needle biopsy in patients who otherwise meet ACOSOG Z0011 eligibility criteria.MethodsPatients with cT1-2N0 breast cancer by physical examination with a positive preoperative LN biopsy were identified from a prospective institutional database. Clinicopathologic characteristics and axillary imaging results were compared between women with 1 to 2 total positive LNs and ≥3 total positive LNs.ResultsBetween May 2006 and December 2013, a total of 141 women with cT1-2N0 breast cancer had abnormal axillary imaging and a preoperative positive LN biopsy (median patient age 51 years, median tumor size 2.4 cm, 86 % ductal histology, 79 % estrogen receptor positive). Sixty-six women (47 %) had 1 to 2 total positive LNs, and 75 (53 %) had ≥3 total positive LNs. Women with ≥3 total positive LNs had larger tumors (2.4 vs. 2.2 cm, p = 0.03), fewer tumors with ductal histology (79 vs. 94 %, p = 0.01), more lymphovascular invasion (80 vs. 61 %, p = 0.01), and higher median body mass index (29.2 vs. 27.1 kg/m(2), p = 0.04). Having >1 abnormal LN on axillary imaging was significantly associated with having ≥3 total positive LNs at final pathology (68 vs. 43 %, p = 0.003).ConclusionsAxillary imaging with preoperative LN biopsy does not accurately discriminate low- versus high-volume nodal disease in clinically node-negative patients.

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