In another independent study, we observed that securin is co-localized with CSCs markers such as CD24, CD34, CD133, ALDH1, OCT4, SSEA4, SHH, β-Catenin and LGR5 (unpublished observations) in the normal ovary, BN, BL and HG ovarian tumors, suggesting that there exists a relationship between securin and CSC population. The gene discussed is PTTG1; the disease is ovarian neoplasm.