In a study of such potential cervical cancer biomarkers as Musashi, ALDH1, Sox2, and CD49f using PCR and immunohistochemical methods, it was found that according to the results of PCR, the expression of all markers increased compared to normal cervical tissues, and these CSC markers were associated with a poor prognosis of patients with squamous cell carcinoma of the cervix [61]. This evidence concerns the gene ALDH1A1 and cervical squamous cell carcinoma.