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Published in: Cellular Oncology 4/2011

01-08-2011 | Original Paper

Gene expression in oligodendroglial tumors

Authors: Elisabeth J. Shaw, Brian Haylock, David Husband, Daniel du Plessis, D. Ross Sibson, Peter C. Warnke, Carol Walker

Published in: Cellular Oncology | Issue 4/2011

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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.
Appendix
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Glossary
WHO
World Health Organization
OII
oligodendroglioma grade II
OIII
oligodendroglioma grade III
OAII
oligoastrocytoma grade II
OAIII
oligoastrocytoma grade III
PCV
procarbazine, lomustine (CCNU), and vincristine
CR
complete response
PR
partial response
MR
minor response
PD
progressive disease
SD
stable disease
HPRT
hypoxanthyl-phosphoribosyl transferase
aRNA
antisense RNA
PCA
principle component analysis
SAM
significance analysis of microarrays
FDR
false discovery rate
ECACC
European Collection of Cell Cultures
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Metadata
Title
Gene expression in oligodendroglial tumors
Authors
Elisabeth J. Shaw
Brian Haylock
David Husband
Daniel du Plessis
D. Ross Sibson
Peter C. Warnke
Carol Walker
Publication date
01-08-2011
Publisher
Springer Netherlands
Published in
Cellular Oncology / Issue 4/2011
Print ISSN: 2211-3428
Electronic ISSN: 2211-3436
DOI
https://doi.org/10.1007/s13402-011-0036-6

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