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Mebendazole and radiation in combination increase survival through anticancer mechanisms in an intracranial rodent model of malignant meningioma.

Al's Comment:

 Mebendazole is an old, cheap, easily available drug approved for  treating worm infestations.  This paper (and many others) suggest it might be useful for treatments brain tumors, especially when combined with radiation. This article is about meningiomas but other articles mention GBM and Medulloblastomas!

 


Posted on: 11/11/2018

. J Neurooncol. 2018 Nov 9. doi: 10.1007/s11060-018-03009-7. [Epub ahead of print]

Mebendazole and radiation in combination increase survival through anticancer mechanisms in an intracranial rodent model of malignant meningioma.

Skibinski CG1, Williamson T1, Riggins GJ2.
 
Author information:
1. Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, 21287, USA.
2. Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, 21287, USA. griggin1@jhmi.edu.
Abstract
PURPOSE:
 
Meningiomas are a frequent tumor of the central nervous system. Although mostly benign, approximately 5% present as atypical or malignant tumors. Treatments for atypical meningiomas include gross total resection and radiotherapy, but about 33% of patients have recurrent tumors, sometimes as a higher grade. Recently, the brain penetrant anthelmintic drug, mebendazole, has shown promise as an anticancer agent in rodent models of glioblastoma and medulloblastoma.
METHODS:
 
The half maximal inhibitory concentration (IC50) effect on colony formation, cell proliferation, and caspase-3/7 markers of apoptosis of mebendazole with and without radiation was measured in vitro. Mice intracranially implanted with KT21MG1 human meningioma were administered mebendazole alone or in combination with radiation. Survival benefit was evaluated, while tumors were investigated by immunohistochemical staining for apoptosis, cell proliferation, and vascular density.
RESULTS:
 
In vitro experiments on meningioma cell lines showed the IC50 for mebendazole in the range of 0.26-0.42 µM. Mebendazole alone induced cytotoxicity, however the combination had a greater reduction in colony formation and resulted in higher levels of cleaved caspase-3. The in vivo study showed both, mebendazole alone and the combination, to have a survival benefit with an increase in apoptosis, and decreases in tumor cell and vascular proliferation.
CONCLUSION:
 
These preclinical findings indicate that mebendazole alone or in combination with radiation can be considered for the treatment of malignant meningioma. The mechanism of action for this combination may include an increase in apoptosis, a reduction in proliferation and angiogenesis, or a combination of these effects.

 


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