For example, the expression of TET1 was shown to negatively correlate with miR-29a and this negative correlation was stronger in estrogen receptor (ER) negative breast cancer samples compared to ER+ ones (35) In another research that studied the role of TET1 in TNBC, TET1 expression was shown to inversely correlate with the expression of EZH2 (25). This evidence concerns the gene ESR1 and breast carcinoma.