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A phase II study of weekly paclitaxel/estramustine/carboplatin in hormone-refractory prostate cancer.

PURPOSE
The 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 METHODS
Eighty-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.


RESULTS
Intent-to-treat analysis revealed a > or = 50% prostate-specific antigen decrease rate of 61%. Median survival was 15.3 months. The most frequent grade > or = 3 toxicities included fatigue (11%), nausea (10%), neutropenia (9%), anemia (6%), and vomiting (6%).


CONCLUSION
Paclitaxel/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.