816P Laparoscopic versus open-surgery in FIGO stage II endometrioid endometrium cancers: Is there a prognostic effect?

5605 Background: Based on two randomized trials (LACE and LAP2) minimal invasive surgery has turned into the surgical standard in early stage endometrial cancer including “high-risk” patients. However, these recommendations are predominately based on “low-risk” cancers, which are mainly represented in both trial collectives. We herein provide a retrospective study, which focuses on potential differences in clinical outcome in early stage endometrioid endometrial cancers with distinct risk constellations treated by laparoscopy or open surgery. Methods: 420 early stage endometrial cancers were retrospectively dichotomized according to the surgical approach and correlated to the recurrence rate and clinical outcome. In addition, subgroup analyses were performed according relevant clinical risk parameters, namely FIGO stage, grading and LVSI. Results: The analyzed collective consisted of 73.8% stage IA, 19.5% stage IB, and 6.7% stage II cases. Twenty-tree percent of patients exhibit G3 tumors and LVSI was detected in 12.4%. Minimal invasive surgery was performed in 54.5% of study patients. During a median follow-up of 5.0 years, recurrence or death were observed in 8.3% and 6.7%, respectively. Recurrences were predominately located in the vaginal cuff (n = 21; 60.0%), to a minor extent in loco-regional lymph nodes (n = 11; 31.4%), and in three patients (8.6%) in both sides. No distant metastases were detected at first recurrence. Also under consideration of the mentioned clinicopathologic parameters, the surgical approach in FIGO stage I did not influence the recurrence rate and patients’ survival. However, in a subgroup analysis of stage II disease, the laparoscopic approach was clearly associated with a significant higher recurrence rate (85.7% vs. 14.3%; p = 0.013). All of the recurrences were located in the vaginal cuff, and in one case, additional relapse was found in loco-regional lymph nodes. Moreover, laparoscopic surgery in stage II disease was associated with impaired progression-free and overall survival (HR 8.86 (1.008 – 20.85) and HR 6.36 (1.102 – 28.61), respectively). Conclusions: We herein demonstrate that a minimal invasive surgical approach in stage II endometrial cancer is associated with higher recurrence rates and impaired clinical outcome. These data could be interpreted to be in line with the results of the LACC trial in cervical cancer. Although, grounded on a retrospective analysis, these hypothesis-generating results warrants a confirmatory trial, which is ongoing in a much larger collective of stage II endometrial cancer patients.