Screening Blood and Vitreous for Biomarkers Associated with Proliferative Diabetic Retinopathy.

PDR blood sample analysis as compared to controls showed a trend for increased expression of VEGFA by 1.2-fold (PDR = 0.88, control = 0.74, p = 0.57), whereas the other examined genes showed a trend of reduced expression; HIF2A decreased by 0.50-fold (PDR = 0.38, control = 0.75, p = 0.07), PAI by 0.51-fold (PDR = 0.35, control = 0.69, p = 0.09), TIE-1 by 0.79-fold (PDR = 0.79, control = 1.00, p = 0.54), TIE-2 by 0.70-fold (PDR = 0.58, control = 0.82, p = 0.34), and ANGPT2 by 0.45-fold (PDR = 0.51, control = 1.15, p = 0.11).

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Although the increase did not reach statistical significance, this trend supports the growing body of evidence implicating VEGFA in the pathophysiology of PDR [ 29 , 30 , 31 ].

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