Table 3.

Comparison of matrix metalloproteinase-9 expression scores with tumor size by Kruskal-Wallis ANOVA

Tumor size	Parenchyma			Stroma			Average MMP 9 expression
	Mean	SD	Mean rank	Mean	SD	Mean rank	Mean	SD	Mean rank
T1	2	0.894	7.17	0.67	0.516	4.17	1.50	0.837	5.67
T2	3.06	0.659	15.94	2.18	0.636	16.24	2.94	0.659	16.50
T3	3.57	0.535	21.57	2.86	0.378	23.43	3.43	0.535	21.50
Total	2.97	0.850		2.03	0.928		2.77	0.935
H	10.268			17.605			12.727
P	0.006			0.000			0.002
Pairwise comparisons by Mann-Whitney U-test
	P			P			P
T1 versus T2	0.015*			0.000*			0.003*
T1 versus T3	0.007*			0.001*			0.004*
T2 versus T3	0.083			0.052			00.099

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