American Association for Cancer Research
Browse
19406207capr120316-sup-f2_52k.pdf (52.5 kB)

Supplementary Figure 2 from Is There a Link Between Genome-Wide Hypomethylation in Blood and Cancer Risk?

Download (52.5 kB)
journal contribution
posted on 2023-04-03, 19:24 authored by Kevin Brennan, James M. Flanagan

PDF file - 52K, Meta-analysis of LINE1

History

ARTICLE ABSTRACT

Cancer cells display widespread genetic and epigenetic abnormalities, but the contribution to disease risk, particularly in normal tissue before disease, is not yet established. Genome-wide hypomethylation occurs frequently in tumors and may facilitate chromosome instability, aberrant transcription and transposable elements reactivation. Several epidemiologic case–control studies have reported genomic hypomethylation in peripheral blood of cancer patients, suggesting a systemic effect of hypomethylation on disease predisposition, which may be exploited for biomarker development. However, more recent studies have failed to reproduce this. Here, we report a meta-analysis, indicating a consistent inverse association between genomic 5-methylcytosine levels and cancer risk [95% confidence interval (CI), 1.2–6.1], but no overall risk association for studies using surrogates for genomic methylation, including methylation at the LINE-1 repetitive element (95% CI, 0.8–1.7). However, studies have been highly heterogeneous in terms of experimental design, assay type, and analytical methods. We discuss the limitations of the current approaches, including the low interindividual variability of surrogate assays such as LINE1 and the importance of using prospective studies to investigate DNA methylation in disease risk. Insights into genomic location of hypomethylation, from recent whole genome, high-resolution methylome maps, will help address this interesting and clinically important question. Cancer Prev Res; 5(12); 1345–57. ©2012 AACR.

Usage metrics

    Cancer Prevention Research

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC