Imbalance between matrix metalloproteinase 9 and tissue inhibitor of metalloproteinases 1 expression by tumor cells implicated in liver metastasis from colorectal carcinoma.
We have evaluated the degree of MMP-9 and TIMP-1 messenger RNA (mRNA) expressions according to cell types in tumor tissues, and evaluated the implication of balance between the MMP-9 mRNA and the TIMP-1 mRNA expression in liver metastasis using orthotopic-implanted colon cancer in nude mouse, and also in 47 patients with colorectal cancer. The grade of MMP-9 or TIMP-1 mRNA expression was classified into 4 categories according to positive cell ratio. A higher grade of MMP-9 mRNA expression in ...Expand abstract
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