CD274 and cervical squamous intraepithelial neoplasia: In accordance with these results, the correlation analysis showed that the mononuclear PD-L1 expression was correlated with clinicopathological parameters including HPV type, initial Pap test results, HPV persistence, and CIN persistence or recurrence after the initial evaluation (p = 0.0180, p = 0.0109, p = 0.0137, and p = 0.0308, respectively).