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Her2neu Amplification Associates with Co-deletion 1p/14q in Recurrent Meningiomas

Published online by Cambridge University Press:  23 September 2014

Brenda O. Hamilton ,
Joanne S. Sy ,
Joseph F. Megyesi  and
Lee Cyn Ang
Brenda O. Hamilton*
Affiliation:
Department of Molecular Pathology, London Health Science Center, London, Ontario, Canada
Joanne S. Sy
Affiliation:
Department of Neuropathology, University of Sydney, NSW 2006, Australia
Joseph F. Megyesi
Affiliation:
Department of Clinical Neurosciences, London Health Science Center, London, Ontario, Canada
Lee Cyn Ang
Affiliation:
Department of Neuropathology, London Health Science Center, London, Ontario, Canada
*
Molecular Pathology, London Health Science Center, Victoria Hospital, 800 Commissioners Rd E, London, Ontario, N6A 5W9, Canada. Email: [email protected]
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Abstract

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Background:

The current methods to predict recurrence and aggressive behaviour of meningiomas rely mainly on histological grading, histological subtype, proliferative index, as well as brain invasion. In many instances, histological grade alone fails to predict recurrence in the grade I and grade II meningiomas. Deletions of 1p and 14q have previously been reported to correlate with poor prognosis in terms of either recurrence or higher histological grades. The Her2neu (ErbB2) amplification has been shown to be a useful predictor of aggressive behaviour in breast and ovarian tumours, but its significance in meningioma is so far uncertain.

Method:

In order to determine the cytogenetic differences between 22 recurrent and 25 non-recurrent meningiomas of all grades, we used fluorescent in situ hybridization (FISH) DNA probes for 1p36, 14q11.2 and 17q11.2-12 (Her2neu) on formalin fixed paraffin embedded (FFPE) tissue from the Brain Tumour Tissue Bank (BTTB), London Health Science Center (LHSC).

Results:

We showed a positive association for meningioma recurrence correlated with 1p36 deletion plus or minus 14q 11.2 deletions in all grades of meningiomas. The Her2neu amplification was strongly associated with 1p/14q co-deletion in cases of recurrent meningiomas, especially the higher grade tumours.

Conclusion:

These cytogenetic markers can be applied in addition to histological grading for predicting the risk of recurrence and biological behaviour.

Résumé:

Résumé:Contexte:

Les méthodes actuelles pour prédire une récidive et un comportement agressif des méningiomes sont fondées principalement sur le grade histologique de la tumeur, son sous-type histologique, l'indice de prolifération et l'envahissement de la tumeur. Dans plusieurs cas, le grade histologique seul ne prédit pas la récidive dans les méningiomes de grade I et de grade II. Des délétions 1p et 14q ont été rapportées antérieurement comme étant corrélées à un mauvais pronostic en ce qui concerne la récidive ou à un grade histologique supérieur. Il a été démontré que l'amplification de Her2neu (ErbB2) est un facteur de prédiction utile d'un comportement tumoral agressif dans les tumeurs du sein et de l'ovaire, mais sa signification dans le méningiome demeure incertaine.

Méthode:

Nous avons utilisé l'hybridisation in situ avec sonde fluorescente d'ADN (FISH) des régions 1p36, 14q11,2 et 17q11,2-12 (Her2neu) sur du tissu inclus dans la paraffine provenant de la Brain Tumour Tissue Bank (BTTB) du London Health Science Center.

Résultats:

Nous avons démontré qu'il existe une association positive entre la récidive du méningiome et une délétion 1p36 plus ou moins 14q11,2 quelque soit le grade du méningiome. L'amplification de Her2neu était fortement associée à une co-délétion 1p/14q dans les cas de méningiomes récurrents, spécialement pour les tumeurs de plus hauts grades.

Conclusion:

Ces marqueurs cytogénétiques peuvent êtres utilisés comme complément de la classification de la tumeur pour prédire le risque de récidive et le comportement biologique de la tumeur.

Type
Research Article
Information
Canadian Journal of Neurological Sciences , Volume 40 , Issue 3 , May 2013 , pp. 361 - 365
Copyright
Copyright © The Canadian Journal of Neurological 2013

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