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- W1754300748 abstract "Previous in vitro and in vivo results suggested that hydroxyurea (HU) and verapamil could suppress meningioma growth individually and synergistically. We evaluated the clinical efficacy and safety of this approach for the treatment of refractory recurrent/progressive meningiomas and expanded our studies in a xenograft orthotopic mouse model.Six women and 1 man, aged 26-76 years (median, 56 years), with magnetic resonance imaging-proven progression of ≥ 25% in cross-sectional area of recurrent meningioma (2 World Health Organization grade I, 5 grade II) within the preceding 6 months received HU 1000 or 1500 mg/day (20 mg/kg/day, twice daily) as well as verapamil sustained-release tablets with dose escalation every 2 weeks (120-240 mg/day). They underwent magnetic resonance imaging every 3 months during therapy. To augment the clinical trial results, we performed mouse orthotopic xenograft experiments using similar dosing to test tumor growth, vascularity, and drug bioavailability.After a mean of 8.1 cycles of treatment, the patients demonstrated no significant radiographic responses during mean follow-up of 14.5 ± 4.8 months. Median progression-free survival (PFS) was 8.0 months, and 6-month PFS was 85%. Side effects occurred in 6 (86%) patients. Xenograft studies showed no effect of individual or combined treatments on meningioma growth. Neither HU nor verapamil was detectable in mouse brain tumor tissue despite adequate serum levels within therapeutic ranges.Our results showed no effect of HU or verapamil on tumor recurrence, PFS, and in vivo tumor burden reduction. Drug delivery to the tumor may be a major limitation." @default.
- W1754300748 created "2016-06-24" @default.
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- W1754300748 date "2016-02-01" @default.
- W1754300748 modified "2023-10-15" @default.
- W1754300748 title "Combined Hydroxyurea and Verapamil in the Clinical Treatment of Refractory Meningioma: Human and Orthotopic Xenograft Studies" @default.
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- W1754300748 doi "https://doi.org/10.1016/j.wneu.2015.09.060" @default.
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