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  • Title: A phase I study of estramustine, weekly docetaxel, and carboplatin chemotherapy in patients with hormone-refractory prostate cancer.
    Author: Oh WK, Hagmann E, Manola J, George DJ, Gilligan TD, Jacobson JO, Smith MR, Kaufman DS, Kantoff PW.
    Journal: Clin Cancer Res; 2005 Jan 01; 11(1):284-9. PubMed ID: 15671557.
    Abstract:
    PURPOSE: To define the maximal tolerated dose, safety, and efficacy of docetaxel, carboplatin, and estramustine in patients with hormone-refractory prostate cancer (HRPC). METHODS: Patients with HRPC received docetaxel for 3 weeks, followed by a rest week. Docetaxel (20, 25, 30, 36, or 43 mg/m2) was given on days 2, 9, and 16 of a 28-day cycle. Patients also received estramustine (140 mg p.o. three times daily on days 1-5, 8-12, and 15-19) and carboplatin [area under the curve, AUC (5) or (6) on day 2]. RESULTS: Thirty patients were treated. Five patients received carboplatin [AUC (6)] but experienced delayed thrombocytopenia. After a protocol amendment, 25 subsequent patients received carboplatin [AUC (5)]. Median age was 64 years. Median prostate-specific antigen (PSA) was 117 ng/mL. Fifty-three percent received prior ketoconazole and 10% had mitoxantrone. No dose-limiting toxicities were noted. Although maximal tolerated dose was not reached, docetaxel dose escalation was stopped at 43 mg/m2. Significant myelosuppression was not seen until the highest dose level, when seven and four patients experienced grade 3 and 4 toxicities, respectively. Among all patients, PSA declines of > or =50% occurred in 63%. At the recommended phase II dose, PSA declines of > or =50% occurred in 75% (95% confidence interval, 43-95). Four of 14 (29%) patients with measurable disease had partial responses. Median survival was 14.6 months. CONCLUSIONS: Estramustine, docetaxel, and carboplatin are well tolerated and active in HRPC. Myelosuppression is the primary toxicity. The recommended phase II dose of docetaxel is 43 mg/m2 combined with estramustine and carboplatin. PSA declines were seen at every dose level.
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