Chromosomal imbalances in clear cell ependymomas

Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc
Christian H RickertWerner Paulus

Abstract

Clear cell ependymoma is a rare and diagnostically challenging subtype of ependymoma, whose genetic features are essentially unknown. We studied 13 clear cell ependymomas (five cases WHO grade II, eight cases WHO grade III) by comparative genomic hybridization (CGH). Chromosomal imbalances were found in 12/13 cases. The most common aberrations overall were +1q (38%), -9 (77%), -3 (31%), and -22q (23%). Clear cell ependymomas of WHO grade II were characterized by -9 (40%), whereas WHO grade III cases mainly showed +1q (63%), and +13q (25%), as well as -9 (100%), -3 (38%), and -22q (25%). In contrast to other ependymal tumors, clear cell ependymomas of WHO grade II showed fewer imbalances than WHO grade III samples (1.4 vs 3.5 per case). Although some of the implicated chromosomes have previously been shown to be involved in other ependymoma variants, the striking frequency of +1q, -9, and -3 suggests that aberrations differ between clear cell and other types of ependymomas, in particular, for loss of chromosome 9 which can be regarded as the molecular hallmark of clear cell ependymomas.

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Citations

Dec 31, 2011·Child's Nervous System : ChNS : Official Journal of the International Society for Pediatric Neurosurgery·M PayetD Frappaz
Oct 17, 2006·Current Oncology Reports·Nicole J Ullrich, Scott L Pomeroy
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Jun 18, 2009·Molecular Cancer Research : MCR·John-Paul KildayRichard Grundy

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