Fig. 3From: Blood-based DNA methylation as biomarker for breast cancer: a systematic reviewAssociations of gene-specific methylation in blood and BC risk. a Studies used the highest methylation quantile as reference. b Studies used the lowest methylation quantile as reference. c Studies used methylation of controls as reference. aThe upper limit of 95% CI of the study of Gupta was over ten. bWidschwendter M and coauthors investigated the genes from ZNF217 to TIMP3 Back to article page