Dose-dense early postoperative intraperitoneal chemotherapy in ovarian cancer: Randomized, phase II trial.

Abstract

5514 Background: Dose-dense early postoperative intraperitoneal chemo (DD-EPIC) had been carried out in advanced ovarian cancer (OC) pts in China over the past three decades but it was not proved by a prospective study. This trial was designed to confirm the benefit of DD-EPIC in delaying progression and improving survival. Methods: In a multicenter, phase 2 trial, pts with FIGO IIIC-IV OC and optimal debulking surgery (residual disease ≤1cm) were randomly allocated to receive 4 doses of weekly DD-EPIC with cisplatin (50mg/m2) and etoposide (100mg/m2) followed by 6 cycles of intravenous (iv) chemo with carboplatin and taxane every 3 weeks (DD-EPIC group), or standard iv chemo alone (iv group). (ClinicalTrials.gov, NCT01669226). Results: Between 2009 and 2015, 218 pts were randomized, of whom 215 initiated treatment (106 to DD-EPIC and 109 to iv; for efficacy analyses). Totally, 36 pts (16·7%) were received neoadjuvant chemo. With a median of 61·9 mos follow-up, 122 pts died (54 in DD-EPIC and 68 in iv group). Remarkable OS benefit of DD-EPIC was recorded (67·5 mos for DD-EPIC vs. 46·3 mos for iv; HR 0·70, 95% CI 0·49-1·00, P=0·047). Pts in DD-EPIC had a significantly increased median PFS compared with those in iv group (21·7 vs. 16·8 mos; HR 0·64, 95% CI 0·47-0·86, P=0·003). Median TFST was 25·1 vs. 18·0 mos in favor of DD-EPIC (HR 0·62, 95%CI 0·46-0·83, P=0·002). Similar findings were detected in TSST (42·2 vs. 29·3 mos; HR 0·66, 95%CI 0·47-0·94, P=0·019). Grade 3 and 4 Leucopenia (53·8% vs. 35·2%), anemia (23·6% vs. 5·6%) and gastrointestinal events (10·4% vs. 1·9%) were more common in DD-EPIC ( P=0·006, P<0·001 and P=0·010, respectively). Ninety-one pts were detected by gBRCA testing, with 25·3% of cases carrying deleterious BRCAm, but PFS and OS benefit were observed in patients with BRCA-wild type (HR 0·46 and 0·55, 95%CI 0·27-0·81 and 0·27-1·11, respectively). Conclusions: DD-EPIC with a higher completion rate and acceptable treatment burden was associated with longer OS than standard iv alone. Owing to the benefit of relatively long-term OS, DD-EPIC may be considered as a valuable option for OC, particularly in developing countries and BRCA-wild type pts. Clinical trial information: NCT01669226. [Table: see text]