YY1 and cervical intraepithelial neoplasia: Previously, we also demonstrated the novel miR-193a-5p-YY1-APC regulatory axis in regulation of endometrioid endometrial adenocarcinoma progression [19], however, to the best of our knowledge, the expression of YY1, E-cadherin and HPV16 E6, as well as the correlations between them, have not been reported on normal cervical tissues, cervical intraepithelial neoplasia (CIN) tissues and CSCC tissues.