Simple epithelia contain the 46 kD intermediate filamentknown as cytokeratin 17, which serves as a marker forcervical reserve (stem) cells. Atypical immature metaplasia,cervical intraepithelial neoplasia, and cervical squamouscarcinoma are among the uterine cervical squamouslesions that can be identified with the help of CK17.Additionally, CK17 aids in oral squamous cell cancerdevelopment.