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LINE-1 Hypomethylation in Blood and Tissue Samples as an Epigenetic Marker for Cancer Risk: A Systematic Review and Meta-Analysis

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  • Martina Barchitta
  • Annalisa Quattrocchi
  • Andrea Maugeri
  • Manlio Vinciguerra
  • Antonella Agodi

Abstract

Objective: A systematic review and a meta-analysis were carried out in order to summarize the current published studies and to evaluate LINE-1 hypomethylation in blood and other tissues as an epigenetic marker for cancer risk. Methods: A systematic literature search in the Medline database, using PubMed, was conducted for epidemiological studies, published before March 2014. The random-effects model was used to estimate weighted mean differences (MDs) with 95% Confidence Intervals (CIs). Furthermore, subgroup analyses were conducted by sample type (tissue or blood samples), cancer types, and by assays used to measure global DNA methylation levels. The Cochrane software package Review Manager 5.2 was used. Results: A total of 19 unique articles on 6107 samples (2554 from cancer patients and 3553 control samples) were included in the meta-analysis. LINE-1 methylation levels were significantly lower in cancer patients than in controls (MD: −6.40, 95% CI: −7.71, −5.09; p

Suggested Citation

  • Martina Barchitta & Annalisa Quattrocchi & Andrea Maugeri & Manlio Vinciguerra & Antonella Agodi, 2014. "LINE-1 Hypomethylation in Blood and Tissue Samples as an Epigenetic Marker for Cancer Risk: A Systematic Review and Meta-Analysis," PLOS ONE, Public Library of Science, vol. 9(10), pages 1-18, October.
    • Handle: RePEc:plo:pone00:0109478
    DOI: 10.1371/journal.pone.0109478
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