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Published on: May 16, 2012
Identification of microRNAs as potential prognostic markers in ependymoma
Fabricio F Costa1, Jared M Bischof, Elio F Vanin
1Cancer Biology and Epigenomics Program, Children's Memorial Research Center and Department of Pediatrics, Northwestern University's Feinberg School of Medicine, Chicago, Illinois, United States of America. fcosta@childrensmemorial.org
Introduction:
We have examined expression of microRNAs (miRNAs) in ependymomas to identify molecular markers of value for clinical management. miRNAs are non-coding RNAs that can block mRNA translation and affect mRNA stability. Changes in the expression of miRNAs have been correlated with many human cancers.
Materials And Methods:
We have utilized TaqMan Low Density Arrays to evaluate the expression of 365 miRNAs in ependymomas and normal brain tissue. We first demonstrated the similarity of expression profiles of paired frozen tissue (FT) and paraffin-embedded specimens (FFPE). We compared the miRNA expression profiles of 34 FFPE ependymoma samples with 8 microdissected normal brain tissue specimens enriched for ependymal cells. miRNA expression profiles were then correlated with tumor location, histology and other clinicopathological features.
Results:
We have identified miRNAs that are over-expressed in ependymomas, such as miR-135a and miR-17-5p, and down-regulated, such as miR-383 and miR-485-5p. We have also uncovered associations between expression of specific miRNAs which portend a worse prognosis. For example, we have identified a cluster of miRNAs on human chromosome 14q32 that is associated with time to relapse. We also found that miR-203 is an independent marker for relapse compared to the parameters that are currently used. Additionally, we have identified three miRNAs (let-7d, miR-596 and miR-367) that strongly correlate to overall survival.
Conclusion:
We have identified miRNAs that are differentially expressed in ependymomas compared with normal ependymal tissue. We have also uncovered significant associations of miRNAs with clinical behavior. This is the first report of clinically relevant miRNAs in ependymomas.
Insights
Researchers identified specific microRNAs (miRNAs) that are altered in ependymomas. These molecular markers show potential for predicting tumor behavior and patient outcomes, offering new clinical management insights.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) are non-coding RNAs regulating gene expression.
- Aberrant miRNA expression is linked to various human cancers, including ependymomas.
- Identifying specific miRNAs in ependymomas can provide valuable molecular markers for clinical management.
Purpose of the Study:
- To identify differentially expressed microRNAs (miRNAs) in ependymomas.
- To correlate miRNA expression profiles with clinical and pathological features of ependymomas.
- To discover novel miRNA-based biomarkers for predicting ependymoma prognosis and patient outcomes.
Main Methods:
- Utilized TaqMan Low Density Arrays to analyze the expression of 365 miRNAs.
- Compared miRNA expression in 34 ependymoma samples (FFPE) with 8 normal brain tissue specimens.
- Correlated miRNA expression profiles with tumor location, histology, and other clinicopathological data.
Main Results:
- Identified over-expressed miRNAs (e.g., miR-135a, miR-17-5p) and down-regulated miRNAs (e.g., miR-383, miR-485-5p) in ependymomas.
- Discovered a miRNA cluster on chromosome 14q32 associated with tumor relapse.
- Found miR-203 as an independent marker for relapse and identified three miRNAs (let-7d, miR-596, miR-367) strongly correlating with overall survival.
Conclusions:
- Established differential expression of specific miRNAs in ependymomas compared to normal tissue.
- Demonstrated significant associations between miRNA expression and ependymoma clinical behavior.
- Reported the first clinically relevant miRNAs for ependymomas, highlighting their potential as prognostic markers.
