Table 1.

Immunohistochemistry staining scores for MKP-1 in tumor differentiation

Group	n	Median staining score	P*
Normal lung tissue	5	1.90
Well differentiation	3	1.68	<0.01
Moderate differentiation	10	1.03	<0.01
Poor differentiation	7	0.72	<0.01

^*Compared to the normal lung tissue group