A Phase II clinical trial of pegylated liposomal doxorubicin and carboplatin in Japanese patients with platinum-sensitive recurrent ovarian, fallopian tube or primary peritoneal cancer

Objective: This single-arm Phase II trial was designed to assess the safety and efficacy of pegylated liposomal doxorubicin and carboplatin combination chemotherapy in patients with platinumsensitive recurrent ovarian cancer. Methods: Patients with a histological diagnosis of epithelial ovarian, fallopian tube or primary peritoneal carcinoma, who were relapse-free at least 6 months after completion of first-line platinumbased chemotherapy, and who had measurable disease and gave consent to participate in this study received infusions of pegylated liposomal doxorubicin (30 mg/m²) at 1 mg/min, followed by carboplatin (AUC 5 mg min/ml) over 30 min every 28 days. Results: Thirty-three of 35 enrolled patients were eligible for efficacy analysis. One patient (3.0%) achieved a complete response, while 16 (48.5%) achieved a partial response, with an overall objective response rate of 51.5% (95% confidence interval, 34.5-68.6%). Among the 22 patients who had evaluable CA125 levels at entry, responses were observed in 18 patients, with a response rate of 81.8% (95% confidence interval, 65.3-98.3%). The median progression-free survival and overall survival rates for all 35 patients were 10.7 months (95% confidence interval, 8.1-13.2 months) and 38.8 months (95% confidence interval, 31.0-46.7 months), respectively. The most frequent Grade 3-4 toxicities, regardless of cause,were neutropenia (82.9%), thrombocytopenia (51.4%), leukopenia (45.7%) and anemia (17.1%). Conclusions: The safety and efficacy of pegylated liposomal doxorubicin and carboplatin combination chemotherapy in patients with platinum-sensitive recurrent ovarian cancer were confirmed. Although there were concerns of severe hematological toxicity with this therapy, this potential complication was safely managed through adequate monitoring of bone marrow function.