Prognostic significance of systematic lymphadenectomy as part of primary debulking surgery in patients with advanced ovarian cancer.

OBJECTIVE The objective of this study was to evaluate the impact of systematic pelvic and para-aortic lymphadenectomy on survival in patients with advanced ovarian cancer. METHODS We retrospectively analyzed the data of 189 consecutive patients with FIGO stage IIIC ovarian cancer between 2000 and 2011, who underwent primary cytoreductive surgery followed by platinum- and taxane-based chemotherapy. All patients were classified into two groups - patients who underwent systematic pelvic and para-aortic lymphadenectomy and those who did not. Progression-free (PFS) and overall survival (OS) times were analyzed using Kaplan-Meier method and Cox proportional hazards model. RESULTS Patients who underwent systematic lymphadenectomy had significantly improved PFS (22 versus 9 months, p<0.01) and OS (66 versus 40 months, p<0.01). In patients with no gross residual disease (NGR) or residual disease 0.1-1cm (GR-1), the median OS time of those who had lymphadenectomy was significantly longer than those who did not (86 versus 46 months, p=0.02). However, in patients with residual disease >1cm (GR-B), there was no significant difference in OS according to lymphadenectomy (39 versus 40 months, p=0.50). Among patients with NGR, the median OS time of those who underwent systematic lymphadenectomy was significantly longer than those who did not undergo lymphadenectomy (not yet reached [>96] and 56 months, p<0.01). No significant difference of OS between patients with and without lymphadenectomy was observed in the subgroup of patients with GR-1 (50 versus 38 months, p=0.44). The performance of lymphadenectomy was a statistically significant and independent predictor of improved OS in addition to the status of residual disease and the performance of radical cytoreductive procedures (hazard ratio, 0.34; [95% CI, 0.23-0.52]; p<0.01). CONCLUSIONS Systematic lymphadenectomy may have a therapeutic value and be significantly associated with improved survival in stage IIIC ovarian cancer patients with grossly no visible residual disease.