Table 5.

Comparison of matrix metalloproteinase-9 expression scores with tumor nodes metastasis stages by Kruskal-Wallis ANOVA

Stages	Parenchyma			Stroma			Average MMP 9 expression
	Mean	SD	Mean rank	Mean	SD	Mean rank	Mean	SD	Mean rank
Stage I	2.00	0.894	7.17	0.67	0.516	4.17	1.50	0.837	5.67
Stage II	2.25	0.500	7.50	1.50	0.577	9.75	2.25	0.500	9.50
Stage III	3.40	0.507	19.60	2.40	0.507	18.40	3.13	0.516	18.43
Stage IV	3.40	0.548	19.60	3.00	0.000	25.00	3.60	0.548	23.30
Total	2.97	0.850		2.03	0.928		2.77	0.935
H	15.278			21.363			17.347
P	0.002			0.000			0.001
Pairwise comparisons by Mann-Whitney U-test
	P			P			P
I versus II	0.643			0.053			0.110
I versus III	0.002*			0.000*			0.001*
I versus IV	0.003*			0.000*			0.002*
II versus III	10.00			0.023*			0.095
II versus IV	0.001*			0.002*			0.001*
III versus IV	0.232			0.143			0.132

*P<0.05. MMP 9: Matrix metalloproteinase-9, SD: Standard deviation