CD274 and cervical intraepithelial neoplasia: Immunohistochemistry (IHC) analysis in cervical intraepithelial neoplasia and cervical cancer revealed no PD-L1 expression in normal cervical epithelium (even when adjacent to cancer), but conversely showed PD-L1 expression in 95% of SILs and 80% of cervical SCCs (both in epithelial squamous and immune cells) [5].