ESR1 and breast cancer: MiR-190b had reduced promoter methylation in estrogen receptor-positive breast cancers (P = 1.02e–12, Median values: ER+ 24.3, ER– 38.26) and miR-190b’s expression was up-regulated in a correlative manner (P = 1.83e–06, Spearman’s rho –0.62).