The content of matrix metalloproteinases (MMP) -2, -7, and -9 was significantly higher in tumors in comparison with the adjacent histologically intact gastric mucosa in 80, 70, and 72% patients with gastric cancer, respectively, the increase in the level of MMP tissue inhibitor-2 (TIMP-2) detected in 61% tumors was insignificant. Only plasma level of MMP-7 was elevated in primary patients in comparison with the control and positively correlated with the expression of this protein in the tumor. The concentration of MMP-7 was maximum in the blood of patients with tumor invasion in lymph vessels. These data suggest MMP-7 as a possible serological marker of gastric cancer.
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