Changes of serum VEGF concentration after intravitreal injection of Avastin in treatment of diabetic retinopathy.

Purpose: Avastin (bevacizumab) intravitreal injections are widely used for treatment of diabetic retinopathy. The aim of our study was to analyze effect of 1.25 mg of intravitreal Avastin on serum concentration of vascular endothelial growth factor (VEGF) in diabetic patients.