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Clinical Trial, Phase I
Journal Article
Research Support, Non-U.S. Gov't
Phase I trial of dose-escalating metronomic temozolomide plus bevacizumab and bortezomib for patients with recurrent glioblastoma.
Journal of Neuro-oncology 2016 October
The average survival time for patients with recurrent glioblastoma is between 5 and 9 months. Phase I and II trials have shown a modest survival benefit with combination temozolomide and other chemotherapeutics. We conducted a phase I trial of dose-escalating temozolomide with bevacizumab and the proteasome inhibitor bortezomib for patients with recurrent disease. Three groups of three patients were scheduled to receive daily doses of temozolomide at 25, 50, and 75 mg/m2 . Fixed doses of bortezomib and bevacizumab were given at standard intervals. Patients were monitored for dose-limiting toxicities (DLT) to determine the maximum-tolerated dose (MTD) of temozolomide with this regimen. No DLT were seen in the first two groups (25 and 50 mg/m2 temozolomide). One patient in the 75 mg/m2 group experienced a grade 4 elevation of ALT and three more patients were accrued for a total of six patients at that dose level. No other DLT occurred, thus making 75 mg/m2 the MTD. Progression-free survival was 3.27 months for all patients and mean overall survival was 20.75 months. The MTD of temozolomide was 75 mg/m2 in combination with bevacizumab and bortezomib for recurrent glioblastoma. Only one patient experienced a severe (Grade 4) elevation of ALT. This study will provide the framework for further studies to elicit effectiveness and better determine a safety profile for this drug combination.
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