Expression of inductive nitric oxide synthase and vascular endothelial growth factor in colonic carcinoma, and their effects on tumor angiogenesis / 中华胃肠外科杂志

ABSTRACT

<p><b>OBJECTIVE</b>To investigate the expression of inductive nitric oxide synthase (iNOS) and vascular endothelial growth factor (VEGF), and their relations with clinicopathological parameters in colonic carcinoma.</p><p><b>METHOD</b>Immunohistochemistry (streptomycin avidin-biotin peroxidase complex, SP) was used to detect the expression of iNOS, VEGF, collagen IV, FVIII Ag in colonic adenocarcinoma, and micro vessel density (MVD) was counted.</p><p><b>RESULTS</b>The positive rates of iNOS and VEGF in colonic carcinoma were 76% and 80% respectively. The MVD in iNOS-positive carcinoma and iNOS-negative carcinoma were 37.0+/- 5.7 and 30.5+/- 4.9. The MVD in VEGF-positive carcinoma and VEGF-negative carcinoma were 39.5+/- 8.5 and 30.7+/- 4.4. The expressions of iNOS and VEGF were positively correlated with MVD. The expression of VEGF was correlated with tumor invasion, differentiation and lymph no de metastasis, but not with patients age,sex and histologic type.</p><p><b>CONCLUSION</b>The expression of iNOS and VEGF may play a role in the angiogenesis, metastasis and invasion of colonic carcinoma.</p>