Phase II study for the suboptimally debulked advanced ovarian cancer: Intravenous platinum followed by interval debulking surgery and intravenous paclitaxel + intraperitoneal cisplatin (KCOG9812 study)

Abstract

5576 Background: Intraperitoneral administration (IP) of cisplatin is recommended by National Cancer Institute for the patients with optimally debulked epitherial ovarian cancer (EOC). However, the advantage is not determined for the suboptimally debulked EOC after the initial surgery. We conducted a phase II study of cisplatin IP after the interval debulking surgery (IDS) following 3 cycles of intravenous platinum. Methods: The initial planned sample size was 30. Eligible patients had previously untreated, histologically confirmed EOC or primary peritoneal carcinoma (PPC) of FIGO stage IIIB-IV with suboptimal (> 1 cm) residual disease. Carboplatin AUC 4 iv d1 and cisplatin 50 mg/sqm iv d3 q21d for 3 cycles. After IDS, paclitaxel 175 mg/sqm iv d1 (or paclitaxel 60 mg/sqm iv d1,d8,d15) and cisplatin 75mg/m2 IP q21d for 4 cycles. Primary endpoint was progression-free survival (PFS) and secondary endpoints were overall survival (OS) and toxicity. Results: 33 patients were enrolled since 1998 till 2005. The median age was 55 (range 19–77). ECOG PS 0/1/2 = 33%/36%/31%; stage IIIB/IIIC/IV = 6%/64%/30%; 91% serous papillary histology. Optimal interval debulking surgery was possible in 85%: none (61%), < 1 cm (24%). Grade 3 or 4 (CTCAE ver.3) non-hematologic toxicity was seen in one patient of neurotoxicity. Grade 3 or 4 hematologic toxicities include: neutropenia (37%), infection (4%), thrombocytopenia (11%). 55% were completed the treatment schedule. The reasons for discontinuing were drug resistance (12%), subileus (4%), elevation of serum creatinine (12%), G3 neurotoxicity (4%), IP catheter block (12%) and infection (4%). Primary recurrent sites of total 20 patients before the second line chemotherapy or surgery were peritoneal cavity (30%), distant metastasis (45%), retroperitoneal lymph nodes (15%), and elevation of serum CA125 (10%). Median PFS was 24 months; median overall survival was 48 months; median follow-up was 36 months (range 15–100). Conclusions: This treatment including cisplatin IP after IDS for the patients with the initially suboptimally debulked EOC was feasible, and showed good prognosis with the small number of the intraperitoneal recurrence. [Table: see text]