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Neuropathol Appl Neurobiol. 2014 Apr;40(3):337-44. doi: 10.1111/nan.12072.

BRAF V600E expression and distribution in desmoplastic infantile astrocytoma/ganglioglioma.

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  • 1Department of Neuropathology, Ruprecht-Karls-Universit√§t Heidelberg, Heidelberg, Germany; Clinical Cooperation Unit Neuropathology, German Cancer Research Center (DKFZ), Heidelberg, Germany.

Abstract

AIMS:

Desmoplastic infantile astrocytoma/ganglioglioma (DIA/DIG) is a rare primary neuroepithelial brain tumour typically affecting paediatric patients younger than 24 months. Knowledge about genetic alterations in DIA/DIG is limited. However, a previous study on BRAF V600E mutation in paediatric glioma revealed a BRAF mutation in one of two tested DIAs/DIGs. The limited number of cases in that study did not allow any conclusion about mutation frequency of BRAF in this tumour entity.

METHODS:

We collected a series of 18 DIAs/DIGs for testing BRAF V600E mutational status by BRAF V600E immunohistochemistry (clone VE1). Cases with sufficient DNA were tested for BRAF V600E mutation by pyrosequencing.

RESULTS:

Three out of 18 DIAs/DIGs presented with VE1 binding. A considerable proportion of BRAF V600E mutated tumour cells was detected in the cortical tumour component, whereas the pronounced leptomeningeal tumoural stroma was predominantly negative for VE1 binding. Pyrosequencing confirmed BRAF V600E mutation in two of three VE1-positive cases.

CONCLUSION:

BRAF V600E mutation affects a subset of DIAs/DIGs and offers new therapeutic opportunities.

© 2013 British Neuropathological Society.

KEYWORDS:

BRAF V600E; VE1; desmoplastic infantile astrocytoma; desmoplastic infantile ganglioglioma; glioma; immunohistochemistry

PMID:
23822828
[PubMed - indexed for MEDLINE]
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