Table 2. Statistical results of immunohistology.

	n	NDRG2		P-value
		−	+ to +++
Total	50	38	12
Sex				0.147a
Male	26	20	6
Female	24	16	8
Age at diagnosis, years				0.173a
<60	25	18	7
>60	25	18	7
Differentiation status				<0.001b
Poor	9	8	1
Moderate	22	18	4
Well	19	10	9
TNM stage				<0.001b
I–II	8	1	7
III	16	11	5
IV	26	24	2

Abbreviations: NDRG2, N-Myc downstream-regulated gene 2; TNM, tumor node metastasis.

^aP-value when expression levels were compared using Fisher's exact test.

^bP-value when expression levels were compared using Kruskal Wallis.