The differences of CDC25C (P = 0.000), pCDC25CSer216 (P = 0.001), CDK1 (P = 0.000), CHK1 (P = 0.000), CHK2 (P = 0.000), PLK1 (P = 0.000) and Aurora A (P = 0.000) expression had statistical significances among these ovarian tumor groups. The gene discussed is PLK1; the disease is ovarian neoplasm.