Solmaz, Ulas; Mat, Emre; Dereli, Murat Levent; Turan, Volkan; Peker, Nuri; Tosun, Gokhan; Dogan, Askin; Adiyeke, Mehmet; Ozdemir, Aykut; Gungorduk, Kemal

Purpose: The purpose of this study was to compare the outcomes of interval debulking surgery after neoadjuvant chemotherapy (NAC/IDS) with primary debulking surgery (PDS) in patients diagnosed with advanced epithelial ovarian cancer (EOC). Methods: A total of 292 patients with IIIC and IV disease stages, who were treated with either NAC/IDS or PDS between 1995 and 2012 were retrospectively reviewed. The study population was divided into two groups: the NAC/IDS group (N=84) and the PDS group (N=208). Progression-free survival (PFS), overall survival (OS), and optimal cytoreduction were compared. Results: The mean patient age was significantly higher in the NAC/IDS group (61.5±11.5 vs 57.8±11.1, p=0.01). Optimal cytoreduction was achieved in 34.5% (29/84) of the patients in the NAC/IDS group and in 32.2% (69/208) in the PDS group (p=0.825). The survival rates were comparable. The survival rate of patients who received optimal cytoreductive surgery in either the PDS or the NAC/IDS arm was significantly higher than that of patients who received suboptimal cytoreductive surgery (p<0.01 and p<0.01, respectively). Multivariate analysis confirmed the treatment method, amount of ascitic fluid, and optimal cytoreduction as independent factors for OS. Conclusions: There was no definitive evidence regarding whether NAC/IDS increases survival rates compared with PDS. NAC should be reserved for patients who cannot tolerate PDS or when optimal cytoreduction is not feasible.