Background and objectives: Many breast cancer patients undergoing completion axillary lymph node dissection (CALND) for sentinel lymph node (SLN) metastases have no further disease. Predicting patients at high risk of non-sentinel lymph node (NSLN) metastasis may help guide effective utilization of CALND.
Methods: SLN+ breast cancer patients undergoing frozen section (FS) analysis at a single institution (2004-2010) were studied retrospectively. Factors associated with NSLN metastases were identified.
Results: Two-hundred forty SLN+ patients were identified. The incidence of NSLN metastases was 45% in FS(+) patients undergoing CALND, compared to 10% of FS(-) patients following CALND (P < 0.001). Multivariate analysis revealed that FS positivity, tumor size, and the presence of angiolymphatic invasion were significant factors associated with NSLN metastases (all P < 0.05). Further analysis of FS(+) patients revealed that tumor size, ER(-) status, and lymph node metastasis size were also associated with risk of NSLN metastases. An algorithm for the management of the axilla in SLN+ breast cancer patients was devised, based on clinic-pathologic predictors of NSLN metastases.
Conclusion: A SLN+ biopsy by FS predicts the presence of NSLN metastases and, in combination with other factors, may justify immediate CALND. CALND may, however, be avoided in selected low-risk SLN+ patients.
Copyright © 2011 Wiley Periodicals, Inc.