Prostaglandin E2 , platelet-derived growth factor ( PDGF ) AA , eotaxin , vascular endothelial growth factor , interferon - inducible protein of 10 kDa , monocyte chemoattractant protein 1 , growth-related oncogene , interleukin 6 , interleukin 8 ( IL-8 ) , and tumor necrosis factor were detectable in the aqueous and vitreous of at least half of the eyes , and these cytokines were analyzed further .