Abstract
Purpose
The primary objective was to determine the maximum tolerated doses (MTDs) of the combination of bortezomib and temozolomide in patients with solid tumors. The secondary objective was to evaluate the pharmacokinetics (PK) of bortezomib with and without concurrent hepatic enzyme-inducing anticonvulsants (HEIAs).
Methods
Bortezomib was administered on days 2, 5, 9, and 12; temozolomide on days 1–5 of a 28-day cycle. Dose escalation proceeded using a standard 3+3 design. Patients with primary or metastatic brain tumors were eligible and were stratified based on whether they were taking HEIAs or not.
Results
Of the 25 patients enrolled, 22 were not taking HEIAs. MTDs were only given to patients not receiving HEIAs. Dose-limiting toxicities (DLTs) consisted of grade-3 constipation, hyponatremia, fatigue, elevated hepatic enzymes, and grade-4 neutropenia, thrombocytopenia, constipation, and abdominal pain. Stable disease (>8 weeks) was observed in 5 patients. Bortezomib systemic clearance (CLsys) on day 9 was 51% of the CLsys on day 2 (P < 0.01) Similarly, the normalized area under the concentration–time curve (norm AUC) on day 9 was 1.9 times the norm AUC on day 2 (P < 0.01). The median bortezomib CLsys on days 2 and 9 was significantly higher (P < 0.04) in patients taking HEIAs, and the median norm AUC was correspondingly lower (P < 0.04).
Conclusions
The MTDs for the combination of bortezomib and temozolomide in patients not taking HEIAs are 1.3 and 200 mg/m2, respectively. The rate of bortezomib elimination in patients taking HEIAs was increased twofold. Additional trials are needed to better define the optimal dosing in such patients.
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Acknowledgments
We would like to thank Ms. Brenda Williams, the Phase I research nurse for this study. Grant Support: NIH training grant (K12 CA01727; J. Portnow), and a Cancer Center Support Grant (P30 CA33572).
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No financial conflict of interest exists for any of the authors.
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Portnow, J., Frankel, P., Koehler, S. et al. A phase I study of bortezomib and temozolomide in patients with advanced solid tumors. Cancer Chemother Pharmacol 69, 505–514 (2012). https://doi.org/10.1007/s00280-011-1721-x
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DOI: https://doi.org/10.1007/s00280-011-1721-x