Abstract
To evaluate the toxicity and maximum tolerated dose (MTD) of arsenic trioxide (ATO) in combination with temozolomide (TMZ) and radiation therapy (RT) in malignant gliomas. A 3 + 3 dose escalation study was performed in patients with newly diagnosed glioblastoma, anaplastic astrocytoma (AA), and anaplastic oligoastrocytoma (AOA). All patients received RT 59–61 Gy in 28–33 fractions, TMZ for 42 days, and ATO 1–2 h prior to RT for 5 days during the first week, then twice weekly until completing RT. Dose levels (DL) were: (1) TMZ 60 mg/m2/ATO 0.2 mg/kg; (2) TMZ 75 mg/m2/ATO 0.2 mg/kg; (3) TMZ 75 mg/m2/ATO 0.25 mg/kg. Dose-limiting toxicity (DLT) was defined as grade 3 non-hematologic toxicity or grade 4 toxicity of any type from enrollment until 3 weeks after finishing RT. 17 patients (13 glioblastoma, 4 AA/AOA) were accrued. Median age was 52 (range 25–80). Median KPS was 90 %. DLT’s occurred at DL 2 (grade 4 transaminase elevation) and DL 3 (grade 4 neutropenia and grade 3 QTc prolongation). The MTD of TMZ 75 mg/m2/ATO 0.2 mg/kg was safe and well tolerated. A phase II study evaluating the efficacy of this combination is underway.
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Acknowledgments
Cephalon Inc., the manufacturer of Arsenic Trioxide, provided research support for this trial, but did not contribute to the study design or interpretation of the study results.
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Grimm, S.A., Marymont, M., Chandler, J.P. et al. Phase I study of arsenic trioxide and temozolomide in combination with radiation therapy in patients with malignant gliomas. J Neurooncol 110, 237–243 (2012). https://doi.org/10.1007/s11060-012-0957-6
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DOI: https://doi.org/10.1007/s11060-012-0957-6