Ki67 immunohistochemical staining is of high value in distinguishing cervical squamous intraepithelial lesions from benign lesions (atrophic cervical squamous epithelium) because Ki67 exhibits higher expression in the former, but Ki67 staining cannot distinguish between dysplasia and immature squamous metaplasia12,13. Here, MKI67 is linked to cervical squamous intraepithelial neoplasia.