Twenty-six ovarian cancer cell lines (8 serous ovarian cancer cell lines, 12 clear ovarian cancer cell lines, 3 mucinous ovarian cancer cell lines, 3 endometrioid ovarian cancer cell lines) and one immortalized normal ovarian surface epithelium cell line (IOSE29) were screened for PAX2 expression by real-time RT-PCR. The gene discussed is PAX2; the disease is ovarian endometrioid adenocarcinoma.