Purpose: The in vivo antitumor activity of a novel topoisomerase I inhibitor, J-107088, was tested in athymic nude mice bearing subcutaneous or intracranial pediatric and adult malignant CNS tumor-derived xenografts.
Methods: J-107088 was administered to animals on days 1-5 and 8-12 via intraperitoneal injection at a dose of 54 mg/kg (162 mg/m2) per day in 10% dimethyl sulfoxide in 0.9% saline. The xenografts evaluated were derived from a childhood glioblastoma multiforme (D-456 MG), a childhood medulloblastoma (D-341 MED), an adult anaplastic astrocytoma (D-54 MG), an adult glioblastoma multiforme (D-245 MG), and a procarbazine-resistant subline of D-245 MG [D-245 MG (PR)].
Results: J-107088 produced regressions and significant growth inhibition in all five of the xenograft lines growing subcutaneously. Growth delays ranged from 7.6 days with D-245 MG to 62.1 days with D-456 MG (P < 0.001). J-107088 also produced an 83% increase in survival in mice bearing intracranial D-456 MG (P < 0.001).
Conclusion: These results indicate that J-107088 may be active in the treatment of childhood and adult malignant brain tumors and provide the rationale for initiation of clinical trials with this agent.