A Phase II Study of Weekly Paclitaxel/Estramustine/Carboplatin in Hormone-Refractory Prostate Cancer

PurposeThe objective of this phase II study was to determine the response rate in patients with hormone-refractory prostate cancer given paclitaxel/estramustine/carboplatin for weeks 1, 2, and 3 of a 4-week cycle.Patients and MethodsEighty-four patients were registered into the trial. Paclitaxel 80 mg/m2 and carboplatin area under the curve of 2 were administered intravenously on days 2, 9, and 16, and oral estramustine 280 mg 3 times daily was given on days 1-3, 8-10, and 15-17 for 6 cycles. Eastern Cooperative Oncology Group performance status 0, 1, and 2 was 46%, 41%, and 13%, respectively, and median age was 70 years (range, 53-82 years), with 58 patients (69%) aged > 65 years. The majority of patients (83%) were white. Fifteen patients (18%) had received previous chemotherapy, 61 patients (73%) had undergone previous surgery, and 51 patients (61%) had received previous external-beam radiation therapy.ResultsIntent-to-treat analysis revealed a ≥ 50% prostate-specific antigen decrease rate of 61%. Median survival was 15.3 months. The most frequent grade ≥ 3 toxicities included fatigue (11%), nausea (10%), neutropenia (9%), anemia (6%), and vomiting (6%).ConclusionPaclitaxel/estramustine/carboplatin administered in a weekly regimen is highly effective in the treatment of hormone-refractory prostate cancer and can be administered with reasonable safety in an outpatient setting.