Detection rate of sentinel lymph nodes in early-stage endometrial cancer according to age

Introduction: Sentinel lymph node (SNL) mapping plays a crucial role in staging patients with an apparent early-stage endometrial cancer. Older age may be associated with lower detection rates due to factors such as decreased lymphatic flow; but consensus is lacking. This study aims to evaluate the impact of age on the SNL detection rate in patients undergoing minimally invasive surgical staging for endometrial cancer. Materials and methods: This multicenter retrospective study included apparent early-stage endometrial cancer patients undergoing minimally invasive surgical staging, including SLN mapping across four ESGO-accredited centers (2020–2023). Patients were categorized into two age groups: <65 years, defined as younger adults and ≥65 years, defined as older adults. Univariate and multivariate logistic regression models were used to identify predictors of bilateral mapping. Results: Overall, 642 patients were identified: 342 (53.3%) patients were classified as younger adults and 300 (46.7%) as older adults. The overall bilateral SLN detection rate was 89.3%, with no or unilateral detection in 10.7% of patients. Older adults had a significantly lower bilateral detection rate than younger adults (85.0% vs. 93.0%, p = 0.005). Multivariate analysis identified age ≥65 years as the only independent predictor of failed bilateral mapping (OR 2.2, 95 % CI 1.3–3.8, p = 0.003). Other clinical, surgical, and pathological factors were not associated with mapping failure. Conclusion: Age ≥65 is independently associated with decreased bilateral SLN detection in early-stage endometrial cancer. Nevertheless, SLN biopsy remains a feasible and reliable staging method in older adults when performed using standardized techniques by experienced surgeons.