Sentinel Lymph Node Sampling as an Alternative to Lymphadenectomy in Patients With Endometrial Cancer and Obesity.

OBJECTIVE: Although its use in endometrial cancer staging is relatively new, sentinel lymph node (SLN) sampling has been shown to be highly accurate and is associated with few complications. However, some studies report lower rates of detection with SLN sampling among patients with obesity. The aim of the current study is to evaluate the feasibility of SLN sampling in endometrial cancer for patients with obesity, and to determine whether omitting lymph node dissection (LND) in surgical staging using SLN sampling impacts oncologic outcomes. METHODS: we conducted a retrospective study of patients with obesity (BMI ≥35 kg/m2), diagnosed with endometrial carcinoma between 2007 and 2017, that compared surgical and oncologic outcomes of 2 cohorts: patients who underwent LND and patients who underwent SLN without lymphadenectomy. The primary outcome was operative time. Secondary outcomes included intraoperative bleeding; lymph node assessment information; intraoperative and postoperative adverse events; and oncologic outcomes including progression-free survival (PFS), overall survival (OS), and disease-specific survival (DSS). PFS was defined as the time from surgery to the recurrence or death from any cause. OS was defined as time from diagnosis to death or the last date the patient was known to be alive, and DSS was defined as the time from the surgery to death from the disease. RESULTS: Out of 223 patients with a median BMI of 40.6 kg/m2, 140 underwent LND and 83 underwent SLN alone. The median operative time for patients in the SLN group was shorter than that of patients in the LND group (190.5 [range 108-393] vs. 238 [131-440] min; P < 0.001), and the SLN group had lower median estimated blood loss than the LND group (30 [range 0-300] vs. 40 [range 0-800] mL; P = 0.03). At the 24-month follow-up cut-off, 98% of patients were alive and 95.5% were disease free, with no significant differences in OS, DSS, and PFS between the 2 groups (P = 0.7, P = 0.8, and P = 0.4, respectively). CONCLUSIONS: In patients with obesity, omitting LND from surgical staging with SLN sampling was associated with shorter operative times and less bleeding and did not affect survival at 2 years.