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Published in: BMC Cancer 1/2019

Open Access 01-12-2019 | Colorectal Cancer | Research article

Global differences in the prevalence of the CpG island methylator phenotype of colorectal cancer

Authors: Shailesh Mahesh Advani, Pragati Shailesh Advani, Derek W. Brown, Stacia M. DeSantis, Krittiya Korphaisarn, Helena M. VonVille, Jan Bressler, David S. Lopez, Jennifer S. Davis, Carrie R. Daniel, Amir Mehrvarz Sarshekeh, Dejana Braithwaite, Michael D. Swartz, Scott Kopetz

Published in: BMC Cancer | Issue 1/2019

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Abstract

Background

CpG Island Methylator Phenotype (CIMP) is an epigenetic phenotype in CRC characterized by hypermethylation of CpG islands in promoter regions of tumor suppressor genes, leading to their transcriptional silencing and loss of function. While the prevalence of CRC differs across geographical regions, no studies have compared prevalence of CIMP-High phenotype across regions. The purpose of this project was to compare the prevalence of CIMP across geographical regions after adjusting for variations in methodologies to measure CIMP in a meta-analysis.

Methods

We searched PubMed, Medline, and Embase for articles focusing on CIMP published from 2000 to 2018. Two reviewers independently identified 111 articles to be included in final meta-analysis. We classified methods used to quantify CIMP into 4 categories: a) Classical (MINT marker) Panel group b) Weisenberg-Ogino (W-O) group c) Human Methylation Arrays group and d) Miscellaneous group. We compared the prevalence of CIMP across geographical regions after correcting for methodological variations using meta-regression techniques.

Results

The pooled prevalence of CIMP-High across all studies was 22% (95% confidence interval:21–24%; I2 = 94.75%). Pooled prevalence of CIMP-H across Asia, Australia, Europe, North America and South America was 22, 21, 21, 27 and 25%, respectively. Meta-regression analysis identified no significant differences in the prevalence of CIMP-H across geographical regions after correction for methodological variations. In exploratory analysis, we observed variations in CIMP-H prevalence across countries.

Conclusion

Although no differences were found for CIMP-H prevalence across countries, further studies are needed to compare the influence of demographic, lifestyle and environmental factors in relation to the prevalence of CIMP across geographical regions.
Appendix
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Metadata
Title
Global differences in the prevalence of the CpG island methylator phenotype of colorectal cancer
Authors
Shailesh Mahesh Advani
Pragati Shailesh Advani
Derek W. Brown
Stacia M. DeSantis
Krittiya Korphaisarn
Helena M. VonVille
Jan Bressler
David S. Lopez
Jennifer S. Davis
Carrie R. Daniel
Amir Mehrvarz Sarshekeh
Dejana Braithwaite
Michael D. Swartz
Scott Kopetz
Publication date
01-12-2019
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2019
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-019-6144-9

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