Objective To investigate the effect of cyclooxygenase-2(COX-2) on angiogenesis through detecting the expressions of COX-2 and vascular endothelial growth factor(VEGF) in hepatic cell carcinoma(HCC) tissues.Methods The expressions of COX-2 and VEGF in 30 cases of HCC and 10 normal liver tissues were detected by immunohistochemistry(SP).At the same time,the new vessels were marked with CD34,the tumor microvessel density(MVD) was determined by counting the number of CD34 positive cells of blood vessel endothel...