In a study on normal ovaries (n=9), cystadenomas (n=17), borderline tumors (n=13) and ovarian carcinomas (n=77), the frequency of PLK1 expression was low in normal epithelium and borderline tumors, but in ovarian carcinomas 26% of the cancer tissues were PLK1-positive [14]. The gene discussed is PLK1; the disease is ovarian carcinoma.