文章基本信息

标题：Relationships between Global DNA Methylation in Circulating White Blood Cells and Breast Cancer Risk Factors
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作者：Nayha Chopra-Tandon ; Haotian Wu ; Kathleen F. Arcaro 等
期刊名称：Journal of Cancer Epidemiology
印刷版ISSN：1687-8558
电子版ISSN：1687-8566
出版年度：2017
卷号：2017
DOI：10.1155/2017/2705860
出版社：Hindawi Publishing Corporation
摘要：It is not yet clear whether white blood cell DNA global methylation is associated with breast cancer risk. In this review we examine the relationships between multiple breast cancer risk factors and three markers of global DNA methylation: LINE-1, 5-mdC, and Alu. A literature search was conducted using Pubmed up to April 1, 2016, using combinations of relevant outcomes such as “WBC methylation,” “blood methylation,” “blood LINE-1 methylation,” and a comprehensive list of known and suspected breast cancer risk factors. Overall, the vast majority of reports in the literature have focused on LINE-1. There was reasonably consistent evidence across the studies examined that males have higher levels of LINE-1 methylation in WBC DNA than females. None of the other demographic, lifestyle, dietary, or health condition risk factors were consistently associated with LINE-1 DNA methylation across studies. With the possible exception of sex, there was also little evidence that the wide range of breast cancer risk factors we examined were associated with either of the other two global DNA methylation markers: 5-mdC and Alu. One possible implication of the observed lack of association between global WBC DNA methylation and known breast cancer risk factors is that the association between global WBC DNA methylation and breast cancer, if it exists, is due to a disease effect.