Table 1. Correlation between clinicopathological features and CDK5 expression levels.

Variables	n	CDK5 expression		χ2 a	P
		Low	High
Gender				0.32	0.572
Male	46	22	24
Female	43	18	25
Age (years)				0.103	0.748
<59	26	11	15
⩾59	63	29	34
Tumor size (cm in diameter)				10.156	0.001
<5	37	24	13
⩾5	52	16	36
Nodal metastasis				4.867	0.027
N0	58	31	27
N1/2	31	9	22
Differentiation				6.619	0.034
Well	21	14	7
Moderate	55	23	32
Poor	13	3	10
AJCC stage				6.619	0.01
I/II	56	31	25
III/IV	33	9	24

^aPearson's chi-square was used for the assay. Significant at P<0.05