To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.ajo.2009.07.007 Byline: Xiaoqin Wang (a), Guibo Wang (b), Yi Wang (a) Abstract: To determine vascular endothelial growth factor (VEGF) and hypoxia-inducible factor 1a (HIF-1a) in the vitreous fluid of patients with proliferative diabetic retinopathy (PDR). Author Affiliation: (a) Department of Ophthalmology, Southwest Eye Hospital, Southwest Hospital, Third Military Medical University, Chongqing, China (b) Department of Infectious Diseases, Southwest Hospital, Third Military Medical University, Chongqing, China Article History: Accepted 5 July 2009