RESUMO
The purpose of our study was to quantitate the changes in axillary lymph node dissection (ALND), frozen section (FS), and the impact on costs after the publication of the American College of Surgeons Oncology Group (ACOSOG) Z0011 trial. We compared axillary nodal management and cost data in breast cancer patients who met Z0011 criteria and were treated with lumpectomy and sentinel lymph nodes (SLN) biopsy from 2007 to July 2013. Of 800 patients, 67 (13.5%) and 34 (12.5%) patients in the pre- and post-Z0011 era had 1-2 positive SLN. ALND decreased from 78% to 21% (p < 0.001) after publication of Z0011. The mean overall cost of SLN biopsy was $41,059 per patient, while SLN biopsy with completion ALND was $50,999 (p < 0.001). Intraoperative FS use decreased from 95% to 66% (p = 0.015). Omitting the FS decreased mean costs from $4,319 to $2,036. The application of Z0011 resulted in an overall mean cost savings of $571,653 from 2011 to July 2013. ACOSOG Z0011 significantly impacted axillary management resulting in a 20% reduction in the mean overall cost per patient by omitting ALND. In these patients, intraoperative FS analysis had poor sensitivity (56%) and doubled the cost of pathologic examination. Fewer ALND and intraoperative FS were performed after the publication of ACOSOG Z0011. Eliminating FS and ALND in patients who met Z0011 criteria, results in significant cost savings.