Imbalance between expression of matrix metalloproteinase-9 and tissue inhibitor of metalloproteinase-1 in invasiveness and metastasis of human gastric carcinoma

Table 2 Association between the expression of MMP-9 (matrix metalloproteinase-9) and TIMP-1 (tissue inhibitor of metalloproteinase-1) and invasion and metastasis of gastric carcinoma

MMP-9 expression	TIPM-1 expression	n	Penetrating visceral peritoneum		Lymph node metastasis
			n	Ratio (%)	n	Ratio (%)
+	-	115	74	64.35	97	84.35
	+	52	22	42.31a	23	44.23ab
-	-	62	32	51.61a	33	53.32ab
	+	27	12	44.44a	5	15.52a

^aP < 0.05 vs MMP-9(+)TIMP-1(-);

^bP < 0.05 vs MMP-9(-)TIMP-1(+).