Comparing sentinel lymphadenectomy and complete lymphadenectomy among obese patients (BMI > 30) undergoing minimally invasive hysterectomy for early-stage endometrial cancer: An ACS-NSQIP database study.

e17618 Background: In patients with endometrial cancer, lymph node assessment is used for staging and adjuvant treatment planning. Sentinel lymphadenectomy (SLN) is an acceptable alternative to complete lymphadenectomy due to decreased risk of major complications. As obesity increases in the United States, so does the rate of endometrial cancer. Complete staging may be more challenging in obese patients. Our goal was to evaluate the relative use and complication rates of sentinel versus complete lymphadenectomy among obese patients undergoing minimally invasive hysterectomy (MIH) for early-stage endometrial cancer. Methods: The National Surgical Quality Improvement Program (NSQIP) database was queried for patients diagnosed with stage I to III endometrial carcinoma between 2015 and 2020 who underwent MIH, identified by Current Procedural Terminology (CPT) code. Extent of lymphadenectomy was also identified using CPT codes. Relative utilization of sentinel versus complete lymphadenectomy was evaluated over the study period. Propensity scores were used to control for potential confounders, and complication rates were compared between propensity matched cohorts of sentinel versus complete lymphadenectomy. Major and minor complications were defined by the Clavien-Dindo scale. Results: From 2015 to 2020 a total of 11,844 obese (BMI > 30) patients underwent MIH for stage I to III endometrial cancer. Of these 7,067 (59%) had a lymph node assessment. Sentinel lymphadenectomy was completed in 3,845 patients, and complete lymphadenectomy was completed in 3,222 patients. Over the five-year period, the utilization of SLN increased for obese and non-obese patients. Prior to 2018, complete lymphadenectomy was performed more often. After 2018, SNL was more common. After propensity matching, there was no increased risk of death (OR 0.67, 95% CI 0.06-5.8, p = 1.0), infection (OR 0.86, 95% CI 0.69-1.1, p = 0.20), thrombo-embolic events (OR 0.77, 95% CI 0.51-1.1, p = 0.21), major complications (OR 0.84, 95% CI 0.66-1.1, p 0.15), or minor complications (OR 0.87, 95% CI 0.69-1.1, P = 0.22) in obese patients who underwent SLN compared to complete lymphadenectomy. Conclusions: The average BMI of patients who underwent MIH over the study period was 35. After controlling for comorbidities and other baseline characteristics, there were no significant differences in complication rates between sentinel and complete lymphadenectomy in obese patients. With the adoption of SLN, more patients may be adequately staged, providing more prognostic information and targeted therapies. These results suggest that sentinel lymphadenectomy is a technically feasible and safe staging procedure in obese patients.