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Departments of Pediatrics [H. S. F., S. K., S. M.] and Pathology [H. S. F., D. D. B.] and the Preuss Laboratory for Brain Tumor Research [H. S. F., D. D. B.], Duke University Medical Center, Durham, North Carolina 27710; Section of Hematology-Oncology, Department of Medicine, The University of Chicago Medical Center, Chicago, Illinois 60637 [M. E. D.]; Departments of Cellular and Molecular Physiology and Pharmacology, Pennsylvania State University College of Medicine, The Milton S. Hershey Medical Center, Hershey, Pennsylvania 17033 [A. E. P.]; Department of Neurology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75235 [S. C. S.]; and the Schering-Plough Research Institute, Kenilworth, New Jersey 07033 [J. J. C.]
The activity of 8-carbamoyl-3-methylimidazo[5,1-d]-1,2,3,5-tetrazin-4(3H)-one (temozolomide) in the treatment of a panel of xenografts derived from ependymoma, medulloblastoma, and childhood and adult high-grade glioma was evaluated in athymic nude mice bearing s.c. and intracranial tumors. Temozolomide administered daily for a total of five doses demonstrated marked activity against a panel of Mer+ xenografts despite marginal to moderate activity of 1,3-bis(2-chloroethyl)-1-nitrosourea. The growth delays produced by temozolomide in these xenografts were 1.87.5-fold greater than those produced by procarbazine. Although temozolomide demonstrated marginal activity against the Mer+ cell line D341 Med when a 5-day schedule was used, a high-dose 1-day schedule resulted in moderate activity. Temozolomide produced increases in median survival of 1285% (adult glioma D-54 MG), 323% (childhood glioma D-456 MG), and 68% (ependymoma D612 EP). Pretreatment of mice with O6-benzylguanine increased temozolomide-induced mortality, requiring reduction of the dosage from 1200 to 750 mg/m2 on the single-day regimen. O6-Benzylguanine pretreatment of mice bearing Mer+ D341 Med increased the growth delay of temozolomide, in duplicate experiments, from -3.1 to 4.8 and 1.1 to 4.9 days. These studies suggest that temozolomide may be active in the treatment of a broad spectrum of central nervous system cancers, including Mer+ tumors resistant to 1,3-bis(2-chloroethyl)-1-nitrosourea.
1 This study was supported by NIH Grants NS20023, CA11898, CA56115, NS30245, CA57725, and NS20581 and by American Cancer Society Grant DHP-67 E.
2 To whom requests for reprints should be addressed, at Duke University Medical Center, Department of Pathology, Box 3156, Durham, NC 27710.
Received 3/13/95. Accepted 5/ 1/95.
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