TET1 and breast cancer: LncRNA H19 expression levels in the BC group were significantly lower than those in the PE group (1.103±0.114 versus 1.248±0.124) (p<0.001), whereas TET1 expression levels were significantly higher than those in the PE group (0.988±0.154 versus 0.844±0.138) (p<0.001) (Figure 3).