AIM: To investigate the expression of vascular endothelial cell growth factor( VEGF) and its receptors in vitreous of patients with diabetic retinopathy( DR),and to discuss its role in the development of DR.METHODS: Selected 13 patients( 16 eyes) with DR and15 healthy people( 15 eyes),the expression of VEGF and its receptors( fms-like tyrosine kinase-1,Flt-1 and kinase insert domain containing receptor,KDR) were evaluated by immunohistochemistry in vitreous. The levels of VEGF,the Flt- 1 and KDR in vitreous...