BIRC5 and squamous cell intraepithelial neoplasia: Immunohistochemical analysis of 73 cervical squamous tissues for survivin expression, including 31 normal, 17 low- and 15 high-grade squamous intraepithelial lesions (LSIL, HSIL), and 10 squamous cell carcinomas (SCC) from cone biopsy and hysterectomy specimens, indicated that although nuclear staining of survivin was detected in normal mucosa, LSIL, and HSIL, survivin expression is highest in human papillomavirus (HPV)-infected tissue samples.