PLK1 and carcinoma: In addition, the expression of CDC25C (P = 0.000), pCDC25CSer216 (P = 0.000), CDK1 (P = 0.000), CHK1 (P = 0.000), CHK2 (P = 0.000), PLK1 (P = 0.000) and Aurora A (P = 0.008) between the primary carcinoma without metastasis and serious borderline cystadenoma were also statistically different.