BIRC5 and squamous cell intraepithelial neoplasia: In total, 71 samples of cervical squamous tissue were obtained, including 15 normal squamous epithelia, 25 high-grade squamous intraepithelial lesions (HSILs) and 31 SCCs, from cone biopsy and hysterectomy specimens and stained for survivin expression by immunohistochemistry.