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Clinical Therapy Trails-Drug |
Department of Medicine, University of Wisconsin, Madison, WI 53792 (H.I.R., M.M.); University of California at San Francisco, San Francisco, CA 94143 (S.M.C., M.D.P., K.N.); University of Texas MD Anderson Cancer Center, Houston, TX 77030 (W.K.A.Y., K.H.); University of Pittsburgh, Pittsburgh, PA 15213 (D.S.); Department of Neurology, University of Michigan, MI 48109 (L.J., H.G.); University of Texas Southwestern at Dallas, Dallas, TX 75390 (K.F.); University of Texas at San Antonio, San Antonio, TX 78284 (J.G.K.); University of California at Los Angeles, Los Angeles, CA 90095 (T.C.)
2 Address correspondence and reprint requests to H. Ian Robins, Department of Medicine, University of Wisconsin Comprehensive Cancer Center K4/666, 600 Highland Ave., Madison, WI 53792.
Abstract
This phase II study in recurrent high-grade glioma evaluated the response rate, toxicities, and time to treatment failure of high-dose carboplatin modulated by a 24-h infusion of thymidine (75 g/m2). The trial was based on preclinical data and a prior phase I study (J. Clin. Oncol. 17, 2922-2931, 1999); a phase II recurrent high-grade glioma study was initiated in July of 1998. Thymidine was given over 24 h; carboplatin was given over 20 min at hour 20 of the thymidine infusion. The starting dose of carboplatin had a value of 7 for the area under the curve (AUC), with allowance for dose escalation of 1 AUC unit per cycle if grade 2 toxicity was observed. Treatment cycles were repeated every 4 weeks. Accrual as of September 1999 was 45 patients [4 were unevaluable]: 76% with glioblastoma multiforme (GBM), 20% with anaplastic oligodendroglioma, 2% with mixed type, and 2% with anaplastic astrocytoma. Most patients had prior chemotherapy (78%). As observed in the earlier phase I study (in which carboplatin pharmacokinetics were unaltered by thymidine or antiseizure medications), thymidine was myeloprotective, resulting in a minimal need for dose reduction for patients having a >2 grade toxicity (in only 4% of the courses of treatment). Of 101 total courses, the number of courses (at the AUCs) was 3 (5), 4 (6), 58 (7), 20 (8), 11 (9), and 5 (10). Grade 3 non-hematologic toxicities included headache (4%), altered consciousness (3%), fatigue (1%), and nausea (3%). Responses included 2 partial (1 oligodendroglioma, 1 GBM; 5%); 3 minor (1 anaplastic astrocytoma, 2 GBM; 7.3%); 6 stable disease (14.6%); and 30 progressive disease (73.2%). For GBM patients, median survival was 23 weeks (with a 95% confidence interval of 20 to 50 weeks), and progression-free survival was 8 weeks (with a 95% confidence interval of 7-16 weeks). These results in GBM were comparable to other phase II GBM trials and thus do not represent a therapeutic advance in the treatment of GBM. Taken collectively, however, results are consistent with continued investigation of thymidine in combination with chemotherapeutic agents for high-grade glioma and other malignant diseases. The significant myeloprotection afforded by thymidine may have particular relevance to polychemotherapeutic regimens.
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