Impact of Choosing Wisely Recommendations on Sentinel Lymph Node Biopsy and Postoperative Radiation Rates in Women Over Age 70 Years with Hormone-Positive Breast Cancer.

BACKGROUND In 2016, the Society of Surgical Oncology released a Choosing Wisely guideline recommending sentinel lymph node biopsy (SLNB) omission in females ≥70 years of age with early-stage, hormone-positive, clinically node-negative invasive breast cancer. This study investigated the impact of this guideline on SLNB and radiotherapy rates, in addition to assessing temporal trends of nodal biopsy and factors associated with recurrence. METHODS The study involved a retrospective review of women who met the guideline criteria and underwent partial mastectomy at a single institution between 2009 and 2018. Using the same inclusion criteria, the National Cancer Database was queried to obtain a separate dataset. Statistical analyses included univariate comparisons, and multivariate logistic regression modeling to predict radiotherapy delivery. RESULTS In our institutional series, 487 patients were included, 274 (56.3%) of whom received radiotherapy. There were 414 patients (85.0%) who underwent SLNB, with a nodal positivity rate of 11%. SLNB correlated with higher rates of radiotherapy (63.5% vs. 15.1%, p < 0.001). Age <80 years was an independent predictor of radiotherapy receipt (odds ratio 3.0, 95% confidence interval 0.22-0.52). SLNB performance decreased after 2016 (88.4% vs. 78.4%, p = 0.003). Median follow-up was 4.8 years, with 19 (3.9%) documented recurrences. SLNB performance was not associated with recurrence (2.9% vs. 5.5%, p = 0.279), whereas radiotherapy resulted in reduced recurrence (1.1% vs. 6.1%, p = 0.002). One (0.2%) disease-related mortality was observed. CONCLUSION Recurrence rates and disease-related mortality remain low in this demographic regardless of treatment rendered. Omission of SLNB and radiotherapy should remain a consideration, and efforts in both patient and physician education should continue.