Abstract
Valproic acid (VPA) inhibits histone deacetylase and has been reported to induce apoptosis in glioma. We report 44 heavily pretreated pediatric patients with high-grade glioma or diffuse intrinsic pontine glioma who received VPA as oral continues maintenance treatment with individual dose adaptation. The tumor status when starting the drug was: no measurable disease in 12, measurable but stable disease in 12, and measurable progressive disease in 22 patients. Average trough blood levels of VPA were 99 mg/l. The most frequent complaint was somnolence (three patients), but no severe toxicity was reported. One relapse patient responded, early progression of disease was observed in three frontline patients and in six relapsed patients. Median overall survival duration for all patients was 1.33 years, with large differences between first-line (5-year overall survival, 44%) and relapse therapy (5-year overall survival, 14%). This shows that valproate is safe in this patient population. The moderate tumor efficacy encourages studying the drug further as an element of multi-agent protocols.
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Acknowledgment
Supported by Deutsche Kinderkrebsstiftung, Germany and Core Grant CA 16672. The original HIT-GBM® Database has been used before as a source for analyses with different focuses and different subsets of data [39, 42–44, 53, 54]. This analysis only uses the data generated prospectively for including patients formally enrolled on the treatment study and the registry or at least the registry until 2003 with follow up updated in 2006. The other HIT-GBM publications have been based on overlapping but not identical patient populations.
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Wolff, J.E.A., Kramm, C., Kortmann, RD. et al. Valproic acid was well tolerated in heavily pretreated pediatric patients with high-grade glioma. J Neurooncol 90, 309–314 (2008). https://doi.org/10.1007/s11060-008-9662-x
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DOI: https://doi.org/10.1007/s11060-008-9662-x