Sentinel lymphadenectomy after neoadjuvant chemotherapy for breast cancer may reliably represent the axilla except for inflammatory breast cancer

Abstract

Background: After neoadjuvant chemotherapy, women with locally advanced breast cancer (LABC) undergo a modified radical mastectomy or lumpectomy with axillary lymph node dissection (ALND) and radiotherapy. Sentinel lymphadenectomy (SL) is accepted for axillary evaluation in early breast cancer. We assessed the feasibility and predictive value of SL after neoadjuvant chemotherapy.

Methods: Eligible women received neoadjuvant therapy for LABC and were scheduled to undergo a definitive surgical procedure. Vital blue dye SL was attempted followed by level I and II axillary dissection.

Results: SL was successful in 29 of 34 patients (detection rate, 85%). Thirteen patients (45%) had positive nodes, and eight (28%) had negative nodes on both SL and ALND. In five patients (17%), the sentinel node was the only positive node identified. Overall, there was a 90% concordance between SL and ALND. The false-negative rate and negative predictive value were 14% and 73%, respectively. Among the subgroup without inflammatory cancer, the detection and concordance rates were 89% and 96%, respectively. The false-negative rate was 6%, and the negative predictive value was 88%.

Conclusions: SL after neoadjuvant chemotherapy may reliably predict axillary staging except in inflammatory breast cancer. Further studies are required to assess the utility of SL as the only mode of axillary evaluation in these women.