There was a close relationship between the expression of the VEGF and the angiopoiesis The low expression of VEGF may be the cause of hypogenesis of the villi. 3.

• VEGF的表达与绒毛血管形成密切相关，其表达降低是绒毛发育不良的主要原因，其低表达与URSA的发生存在着相关关系；