Minimal residual disease at primary debulking surgery versus complete tumor resection at interval debulking surgery in advanced epithelial ovarian cancer: A survival analysis.

Objectives: To compare survival outcomes and peri-operative complications in patients with advanced ovarian cancer with 1-10 mm residual disease (RD) at primary debulking surgery (PDS) versus those achieving no gross residual disease (NGR) at interval debulking surgery (IDS).
Methods: Patients operated with the intent of complete cytoreduction for epithelial ovarian/fallopian tube/primary peritoneal cancer, FIGO stage IIIC-IV, RD 1-10 mm at PDS and NGR at IDS, between 01/2010 and 12/2016, were retrospectively included. All patients had at least 2-years of follow-up completed.
Results: 207 patients were included (59 PDS and 148 IDS). Patients in PDS group were younger and had a higher surgical complexity score. There was a higher rate of intra- and major early post-operative complications in the group of PDS vs IDS (16.9% vs 1.3% and 28.8% vs 2.0%, p < 0.0001 respectively). After a median follow up of 56.4 months (range 59.2-65.4), 117 (56.5%) patients died of disease in the whole population. Forty-eight (81.4%) patients had progression/recurrent disease in the PDS group and 120 (81.1%) in the IDS group. Median PFS was 16.2 months and 18.9 months for PDS and IDS group, respectively (p = 0.111). Median OS was 41.4 months and 52.4 months for PDS and IDS group, respectively (p = 0.022).
Conclusions: IDS should be considered the preferred treatment in case millimetric residual disease is expected at PDS in view of the superimposable PFS and the reduced number of perioperative complications.
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