Abstract
Purpose
To research whether serum vascular endothelial growth factor (VEGF) levels could be used to evaluate diabetic retinopathy (DR) progression and to compare vitreous VEGF levels after injections of intravitreal bevacizumab (IVB), ranibizumab (IVR), and triamcinolone acetonide (IVTA) in proliferative diabetic retinopathy (PDR).
Methods
We enrolled a total of 91 eyes of 89 subjects (70 eyes of 68 diabetics and 21 eyes of 21 non-diabetic controls). The diabetic subjects were divided into three groups as PDR (n = 28), non-proliferative diabetic retinopathy (n = 20), and no-DR (n = 20). Eyes with PDR (n = 31) were injected with IVB (n = 7), IVR (n = 10), or IVTA (n = 6) 3 days before vitrectomy, and eight eyes did not receive an injection. Serum and vitreous samples were collected before vitrectomy and analyzed using ELISA.
Results
We found the severity of retinopathy was not correlated with serum VEGF levels (P = .919, ρ = −0.011). Compared with the controls, vitreous VEGF was higher in the PDR (P < .001), whereas serum VEGF did not differ (P = .99). The controls had lower vitreous VEGF than the IVB, IVR, and no-injection subgroups (P = .01, P < .001, and P = .04, respectively). Vitreous VEGF was similar among the injected and no-injection subgroups (P = .17).
Conclusions
Serum VEGF levels may not directly reflect retinopathy progression. Neither IVB, IVR nor IVTA could eliminate vitreous VEGF levels within 3 days before vitrectomy.
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Acknowledgements
This project was supported by the Marmara University Scientific Research Projects Committee (BAPKO) (SAG-C-TUP-121114-0356). The authors declare that there is no conflict of interest. This study was partly presented as a poster at the 68th Annual Scientific Meeting of the American Association for Clinical Chemistry in Philadelphia, PA, USA, held July 31–August 4, 2016, and at the 19th Congress of the European Association for Vision and Eye Research in Nice, France, held October 5–8, 2016.
Funding
This study was supported by the Marmara University Scientific Research Projects Committee (BAPKO) (Grant number SAG-C-TUP-121114-0356). Author Osman Cekic has received research support from BAPKO.
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S-D and C designed the study. C performed the operations. H worked on biochemical analyses. S-D wrote the main manuscript text. S-D prepared tables. All authors (S-D, C, and H) analyzed and reviewed the manuscript.
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Sozen-Delil, F.I., Cekic, O. & Haklar, G. Serum and vitreous vascular endothelial growth factor levels in diabetic retinopathy. Int Ophthalmol 43, 2247–2255 (2023). https://doi.org/10.1007/s10792-022-02620-y
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DOI: https://doi.org/10.1007/s10792-022-02620-y