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Analytical Cellular Pathology
Volume 33, Issue 2, Pages 81-94
http://dx.doi.org/10.3233/ACP-CLO-2010-0533

Gene Expression in Oligodendroglial Tumors

Elisabeth J. Shaw,1 Brian Haylock,2 David Husband,2 Daniel du Plessis,3 D. Ross Sibson,1 Peter C. Warnke,4 and Carol Walker1

1School of Cancer Studies, University of Liverpool, Liverpool, UK
2Clatterbridge Centre for Oncology, Clatterbridge Hospital, Bebington, Wirral, UK
3Salford Royal Hospital and Clinical Neurosciences Research Group, University of Manchester, Manchester, UK
4Department of Neurosurgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA

Copyright © 2010 Hindawi Publishing Corporation and the authors. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background: Oligodendroglial tumors with 1p/19q loss are more likely to be chemosensitive and have longer survival than those with intact 1p/19q, but not all respond to chemotherapy, warranting investigation of the biological basis of chemosensitivity.

Methods: Gene expression profiling was performed using amplified antisense RNA from 28 oligodendroglial tumors treated with chemotherapy (26 serial stereotactic biopsy, 2 resection). Expression of differentially expressed genes was validated by real-time PCR.

Results: Unsupervised hierarchical clustering showed clustering of multiple samples from the same case in 14/17 cases and identified subgroups associated with tumor grade and 1p/19q status. 176 genes were differentially expressed, 164 being associated with 1p/19q loss (86% not on 1p or 19q). 94 genes differed between responders and non-responders to chemotherapy; 12 were not associated with 1p/19q loss. Significant differential expression was confirmed in 11/13 selected genes. Novel genes associated with response to therapy included SSBP2, GFRA1, FAP and RASD1. IQGAP1, INA, TGIF1, NR2F2 and MYCBP were differentially expressed in oligodendroglial tumors with 1p/19q loss.

Conclusion: Gene expression profiling using serial stereotactic biopsies indicated greater homogeneity within tumors than between tumors. Genes associated with 1p/19q status or response were identified warranting further elucidation of their role in oligodendroglial tumors.