Figure 3. Vascular endothelial growth factor concentrations in the vitreous body and serum from proliferative diabetic retinopathy and macular hole patients. The VEGF concentrations in the vitreous were much higher in PDR than in MH patients. In contrast, the VEGF concentrations in the serum were not significantly different between PDR and MH patients. **, p<0.01 versus MH (vitreous body; Tukey test).