A Clinical Phase II Study of a Non-Anthracycline Sequential Combination of Cisplatin-Vinorelbine Followed by Docetaxel as First-Line Treatment in Metastatic Breast Cancer

Abstract

Background: We tested a sequential combination regimen using cisplatin and vinorelbine (PVn) followed by docetaxel as first-line chemotherapy in a phase II clinical trial in metastatic breast cancer (MBC). Patients and Methods: Thirty-five patients were enrolled. Cisplatin 80 mg/m² was given on day 1 and vinorelbine 30 mg/m² on days 1 and 8 every 3 weeks for 4 cycles. Responding patients received docetaxel 75 mg/m² every 21 days for a maximum of 4 cycles. Three patients were excluded from analysis because of death unrelated to treatment. Results: After a median follow-up of 14 months, 32 patients completed the study. The overall response rate was 53.1%. Complete remission was seen in 5 patients (15.6%), partial response in 12 (37.5%), stable disease in 6 (18.75%), and progressive disease in 9 patients (28.1%). Median time to disease progression was 8 months (range 1–24). At 24 months, 12 (37.5%) patients were alive. A total of 183 cycles were administered. Febrile neutropenia was observed in 4 patients (2.2%). Grade II nephrotoxicity occurred in 12 cycles (6.5%) and grade III vomiting in 31/183 cycles (16.9%). Discussion: PVn is a feasible non-anthracycline option as first-line chemotherapy in patients with metastatic breast cancer and has acceptable toxicity. The sequential addition of 4 cycles of docetaxel following 4 cycles of PVn did not improve the overall response rate and results.