Impact of complete surgical staging on survival of patients with early-stage (FIGO I or II) ovarian cancer: Data from the Cote d'Or Registry of Gynecological Cancers from 1998 to 2015.

Introduction: Early-stage ovarian cancer represents 20 to 33% of all ovarian cancers and is thus quite rare in France, with around 1200 new cases per year. No study to date has convincingly demonstrated the utility of lymphadenectomy in early-stage ovarian cancer. We sought to evaluate the impact on overall survival of complete surgical staging in patients management for FIGO stage I and II ovarian cancer.

Methods: We performed a retrospective observational study using data from the Cote d'Or Registry of Gynecological Cancers. We included patients with invasive early stage epithelial ovarian cancer (FIGO stages I and II), diagnosed between 1 January 1998 and 31 December 2015.

Results: A total of 179 patients were included in the study. Patients who had lymphadenectomy were younger on average (P<0.001) and had fewer comorbidities (P=0.03). Lymphadenectomy was performed during the first surgery in 59.2% of cases (58 patients) and during a second, re-staging surgery in 40.8% (n=40). When complete surgical staging was performed, the rate of up-staging (to at least FIGO stage III) was 11.2% (11/98). The median follow-up was 8.4 years. At the study, 31.6% patients with complete surgical staging had died and 48.4% patients also died in the group without lymphadenectomy, HR 0.59 CI [0.36-0.97] P<0.04.

Conclusion: In patients with early-stage ovarian cancer, complete surgical staging appears to yield a benefit in terms of overall survival. In 10 to 15% of cases, it leads to upstaging, with the resultant indication for maintenance therapy, which has also shown a survival benefit.