WT1 and cervical squamous intraepithelial neoplasia: The methylation rates of WT1, NKX6-1 andDBC1 genes were 7.0, 11.6 and 23.3% in normal cervicaltissues, 36.7, 46.7 and 30.0% in CIN tissues, and 89.6, 77.1 and 85.4% incervical cancer tissues.