Table 2. Correlation of PLK1 expression with several clinicopathological factors.

	All cases	PLK1 negative (IRS 0-6)	PLK1 positive (IRS 7-12)	P-value
Age
<60 years	42 (54.5%)	30 (71.4%)	12 (28.6%)	0.611+
>60 years	35 (45.5%)	27 (77.1%)	8 (22.9%)
FIGO stage
I	17 (22.1%)	15 (88.2%)	2 (11.8%)
II	9 (11.7%)	6 (66.7%)	3 (33.3%)	0.165*
III	46 (59.7%)	33 (71.7%)	13 (28.3%)
IV	5 (6.5%)	3 (60%)	2 (40%)
Grade
G1	15 (19.5%)	13 (86.7%)	2 (13.3%)
G2	33 (42.9%)	25 (75.8%)	8 (24.2%)	0.125*
G3	29 (37.6%)	19 (65.5%)	10 (34.5%)

⁺Fisher's exact test;

^*χ² test for trends. PLK=Polo-like kinase; IRS=immunoreactivity-scoring system.