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• W1946344145 abstract "Radiation (RT) is critical to the treatment of high-grade gliomas (HGGs) but cures remain elusive. The BRAF mutation V600E is critical to the pathogenesis of 10-20% of pediatric gliomas, and a small proportion of adult HGGs. Here we aim to determine whether PLX4720, a specific BRAF V600E inhibitor, enhances the activity of RT in human HGGs in vitro and in vivo. Patient-derived HGG lines harboring wild-type BRAF or BRAF V600E were assessed in vitro to determine IC50 values, cell cycle arrest, apoptosis and senescence and elucidate mechanisms of combinatorial activity. A BRAF V600E HGG intracranial xenograft mouse model was used to evaluate in vivo combinatorial efficacy of PLX4720+RT. Tumors were harvested for immunohistochemistry to quantify cell cycle arrest and apoptosis. RT+PLX4720 exhibited greater anti-tumor effects than either monotherapy in BRAF V600E but not in BRAF WT lines. In vitro studies showed increased Annexin V and decreased S phase cells in BRAF V600E gliomas treated with PLX4720+RT, but no significant changes in β-galactosidase levels. In vivo, concurrent and sequential PLX4720+RT each significantly prolonged survival compared to monotherapies, in the BRAF V600E HGG model. Immunohistochemistry of in vivo tumors demonstrated that PLX4720+RT decreased Ki-67 and phospho-MAPK, and increased γH2AX and p21 compared to control mice. BRAF V600E inhibition enhances radiation-induced cytotoxicity in BRAF V600E-mutated HGGs, in vitro and in vivo, effects likely mediated by apoptosis and cell cycle, but not senescence. These studies provide the pre-clinical rationale for clinical trials of concurrent radiotherapy and BRAF V600E inhibitors." @default.
• W1946344145 created "2016-06-24" @default.
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• W1946344145 date "2015-09-18" @default.
• W1946344145 modified "2023-10-18" @default.
• W1946344145 title "Survival advantage combining a BRAF inhibitor and radiation in BRAF V600E-mutant glioma" @default.
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• W1946344145 doi "https://doi.org/10.1007/s11060-015-1939-2" @default.
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