Evaluation of Different Risk Factors for Metastatic Sentinel Lymph Nodes in Endometrial Cancer.

Background/Objectives: This study investigates which demographic, clinical and pathological factors of women with early-stage presurgical EC could be considered risk factors for the presence of different subtypes of metastases in sentinel lymph nodes (SLNs). Methods: This is a retrospective single-center study that collected data between December 2015 and April 2024. EC patients who underwent total hysterectomy with salpingo-oophorectomy and SLN mapping with indocyanine green (ICG) were recorded. Results: Data from 98 women with EC were analyzed. The endometrioid histotype was present in 85 (86%) women, and the non-endometrioid histotype was present in 13 (13%) women. High-grade EC (G3) was present in 21 (21.4%) patients, and low-grade EC (G1-G2) was present in 77 (78.6%) patients. The total number of women with SLN metastasis was 21/98 (21%). Of 21 women, 5 had MAC, 6 had MIC and 10 had ITCs. Conclusions: Preliminary analysis identified three risk factors for nodal involvement: age greater than 67 years, high-grade endometrial carcinomas and myometrial invasion greater than or equal to 50%. Lymphovascular space invasion, histotype 2 and p53 mutation showed a slight, but not statistically significant, tendency to be risk factors for SLN positivity. A deeper analysis with univariate uninominal logistic regression showed that high-grade EC is related to a greater probability of MACs, as shown in other studies, and that low-grade EC (grades 1 and 2) had a strong relationship with low-volume metastasis (LVM); further studies are needed to confirm these results.