Figure 1From: ESR1gene promoter region methylation in free circulating DNA and its correlation with estrogen receptor protein expression in tumor tissue in breast cancer patients Histogram showing breast cancer subtype of poorer prognosis (TN and Her2) have higher percentage of ESR1-DNA promoter methylation > 0.02 relative units, while those phenotypes with better prognosis (luminal A and luminal B) the percentage of ESR1-DNA promoter methylation is < 0.02 relative units. Back to article page