Additional file 2: Fig. S1. E-cadherin promoter sequence. Fig. S2. APE1 mRNA expression in cervical cancer tissues (Related to Fig. 1A). mRNA expression level of APE1 was measured by qRT-PCR and compared the expression level of APE1 between cancer tissues and adjacent tissues. If the APE1 expression level in cancer tissues was higher than adjacent tissues, it was classified as the APE1 high expression group and if there was no difference, it was classified as the APE1 low expression group. Data are presented as mean ± SD and analyzed by unpaired t-test. ***, P