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1p19q LOH patterns and expression of p53 and Olig2 in gliomas: relation with histological types and prognosis.

Authors :
Durand KS
Guillaudeau A
Weinbreck N
DeArmas R
Robert S
Chaunavel A
Pommepuy I
Bourthoumieu S
Caire F
Sturtz FG
Labrousse FJ
Source :
Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc [Mod Pathol] 2010 Apr; Vol. 23 (4), pp. 619-28. Date of Electronic Publication: 2010 Jan 15.
Publication Year :
2010

Abstract

In glial tumors, the loss of heterozygosity of the 1p and 19q chromosomal arms is thought to be a marker of good prognosis in oligodendroglial tumors. However, 1p and 19q loss of heterozygosity may be telomeric, interstitial, centromeric or affect the whole arm of the chromosome and the associations between these different patterns and tumor type, other molecular markers and patient prognosis remain unclear. We analyzed microsatellite markers in a region spanning the chromosome from the telomere to the centromere, to characterize the pattern of 1p and 19q loss of heterozygosity in 39 infiltrative gliomas, including astrocytomas, glioblastomas, oligoastrocytomas and oligodendrogliomas. We then studied the association between loss of heterozygosity and the expression of p53 protein and Olig2, as analyzed using immunohistochemistry, and epidermal growth factor receptor (EGFR) gene amplification, as investigated using fluorescence in situ hybridization (FISH). Finally, we assessed the influence of molecular markers on the overall survival of patients. We identified five different 1p19q loss of heterozygosity patterns among the tumors studied and found that loss of heterozygosity over the whole 1p arm was associated with loss of heterozygosity over the whole 19q arm in 90% of cases. 1p19q whole loss was present in all the classical oligodendrogliomas, whereas other 1p19q loss patterns predominated in oligoastrocytomas. 1p19q whole loss was also significantly associated with Olig2 overexpression, but was never observed in tumors overexpressing p53 protein. We also found that, among patients with contrast-enhancing tumors, those with 1p19q whole loss tended to survive for longer. In combination with classical histological and immunohistochemical data, 1p19q status determination provides pertinent information useful for (1) discriminating between histological types of gliomas and (2) identifying a subgroup of tumors that are associated with a better prognosis.

Details

Language :
English
ISSN :
1530-0285
Volume :
23
Issue :
4
Database :
MEDLINE
Journal :
Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc
Publication Type :
Academic Journal
Accession number :
20081802
Full Text :
https://doi.org/10.1038/modpathol.2009.185