Objective: To investigate the expression of angiopoietin(Ang)-1 and Ang-2 in colorectal tumors and its relations to microvessel density(MVD) in tumor tissue.

• 目的:探讨结直肠肿瘤中血管生成素(ang iopo ietin,A ng)的表达及其与微血管密度(m icrovessel density,MVD)的关系。