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Sunnybrook and Womens College Health Sciences Centre, Molecular and Cellular Biology, Departments of Medical Biophysics [S. M., G. B., G. F., S. K. G., R. S. K.] and Laboratory Medicine and Pathobiology [S. J.], University of Toronto, Toronto, Ontario, M4N 3M5 Canada; Hormone Research Institute, University of California, San Francisco, San Francisco, California 94143-0534 [D. H., G. B.]; and ImClone Systems, Inc., New York, New York 10014 [P. B., D. J. H.]
A number of recent preclinical studies have sparked interest in the conceptof exploiting conventional chemotherapeutic drugs as antiangiogenics. Such antiangiogenic activity is achieved or optimized by metronomic-dosing protocols in which the drug is given at comparatively low doses using a frequent schedule of administration (e.g., once to three times per week) with no breaks, particularly when combined with an endothelial cell-specific antiangiogenic drug. The use of p.o. chemotherapeutic drugs is particularly suitable for this type of treatment strategy. We tested one such drug, cyclophosphamide (CTX), in a protocol wherein the drug was administered to mice at low doses, of
1040 mg/kg on a daily basis through the drinking water. CTX is typically given p.o. to patients, but it has almost always been injected when treating preclinical mouse tumor models. We found p.o. CTX to be a safe and convenient treatment with significant antitumor efficacy. Growth delays were observed for human orthotopic breast or ectopic colon cancer xenografts in nude or SCID mice. Established PC3 human prostate tumor xenografts could be induced to almost fully regress, remaining virtually nonpalpable for
2 months of continuous therapy, after which tumors began to grow progressively. These re-emergent tumors were not found to be drug resistant when tested in new hosts, using the same treatment protocol. Regression of spontaneously arising, late-stage pancreatic islet cell carcinomas in Rip Tag transgenic mice was also observed. The effects of continuous p.o. CTX treatment were enhanced significantly in an orthotopic, metastatic breast cancer xenograft model when used in combination with an antivascular endothelial growth factor receptor-2 blocking antibody. Maximum tolerated dose levels established for other mouse strains proved highly toxic to SCID mice, whereas daily p.o. low-dose regimens of CTX were well tolerated. Taken together, the results demonstrate the feasibility of delivering CTX in a p.o. metronomic chemotherapy regimen, which proved safe, reasonably efficacious, and potentially applicable to chronic treatment. Such a regimen may be particularly well suited for integration with antiangiogenic drugs.
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U. Emmenegger, S. Man, Y. Shaked, G. Francia, J. W. Wong, D. J. Hicklin, and R. S. Kerbel A Comparative Analysis of Low-Dose Metronomic Cyclophosphamide Reveals Absent or Low-Grade Toxicity on Tissues Highly Sensitive to the Toxic Effects of Maximum Tolerated Dose Regimens Cancer Res., June 1, 2004; 64(11): 3994 - 4000. [Abstract] [Full Text] [PDF] |
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J. W. Park, R. S. Kerbel, G. J. Kelloff, J. C. Barrett, B. A. Chabner, D. R. Parkinson, J. Peck, R. W. Ruddon, C. C. Sigman, and D. J. Slamon Rationale for Biomarkers and Surrogate End Points in Mechanism-Driven Oncology Drug Development Clin. Cancer Res., June 1, 2004; 10(11): 3885 - 3896. [Full Text] [PDF] |
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C.-S. Chen, J. T. Lin, K. A. Goss, Y.-a. He, J. R. Halpert, and D. J. Waxman Activation of the Anticancer Prodrugs Cyclophosphamide and Ifosfamide: Identification of Cytochrome P450 2B Enzymes and Site-Specific Mutants with Improved Enzyme Kinetics Mol. Pharmacol., May 1, 2004; 65(5): 1278 - 1285. [Abstract] [Full Text] |
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Y. Hamano, H. Sugimoto, M. A. Soubasakos, M. Kieran, B. R. Olsen, J. Lawler, A. Sudhakar, and R. Kalluri Thrombospondin-1 Associated with Tumor Microenvironment Contributes to Low-Dose Cyclophosphamide-Mediated Endothelial Cell Apoptosis and Tumor Growth Suppression Cancer Res., March 1, 2004; 64(5): 1570 - 1574. [Abstract] [Full Text] [PDF] |
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I. F. Hermans, T. W. Chong, M. J. Palmowski, A. L. Harris, and V. Cerundolo Synergistic Effect of Metronomic Dosing of Cyclophosphamide Combined with Specific Antitumor Immunotherapy in a Murine Melanoma Model Cancer Res., December 1, 2003; 63(23): 8408 - 8413. [Abstract] [Full Text] [PDF] |
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G. Bocci, G. Francia, S. Man, J. Lawler, and R. S. Kerbel Thrombospondin 1, a mediator of the antiangiogenic effects of low-dose metronomic chemotherapy PNAS, October 28, 2003; 100(22): 12917 - 12922. [Abstract] [Full Text] [PDF] |
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G. Petrangolini, G. Pratesi, M. De Cesare, R. Supino, C. Pisano, M. Marcellini, V. Giordano, D. Laccabue, C. Lanzi, and F. Zunino Antiangiogenic Effects of the Novel Camptothecin ST1481 (Gimatecan) in Human Tumor Xenografts Mol. Cancer Res., October 1, 2003; 1(12): 863 - 870. [Abstract] [Full Text] [PDF] |
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F. Bertolini, S. Paul, P. Mancuso, S. Monestiroli, A. Gobbi, Y. Shaked, and R. S. Kerbel Maximum Tolerable Dose and Low-Dose Metronomic Chemotherapy Have Opposite Effects on the Mobilization and Viability of Circulating Endothelial Progenitor Cells Cancer Res., August 1, 2003; 63(15): 4342 - 4346. [Abstract] [Full Text] [PDF] |
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G. Bocci, K. C. Nicolaou, and R. S. Kerbel Protracted Low-Dose Effects on Human Endothelial Cell Proliferation and Survival in Vitro Reveal a Selective Antiangiogenic Window for Various Chemotherapeutic Drugs Cancer Res., December 1, 2002; 62(23): 6938 - 6943. [Abstract] [Full Text] [PDF] |
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G. BERGERS and D. HANAHAN Combining Antiangiogenic Agents with Metronomic Chemotherapy Enhances Efficacy against Late-stage Pancreatic Islet Carcinomas in Mice Cold Spring Harb Symp Quant Biol, January 1, 2002; 67(0): 293 - 300. [Abstract] [PDF] |
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