The tumor tissues were isolated from patients with ovarian clear cell carcinoma, mucinous carcinoma, granulosa cells, as well as low- and high-grade serous carcinoma (International Federation of Gynecology and Obstetrics [FIGO] stage IC–IV) and analyzed for differences in CREB3L1 expression by quantitative real-time RT-PCR. The gene discussed is CREB3L1; the disease is ovarian clear cell cancer.