NCR3 and cervical squamous intraepithelial neoplasia: NK cells are found in the stroma of HPV-infected Cervical intraepithelial neoplasia (CIN); however, NKp30, NKp46, and NKG2D expression is reduced in patients with pre-cancerous or cancerous HPV-induced lesions and, in addition, their cytotoxicity was reduced [51,55].