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Findings from NIH-supported clinical trial help guide management of diabetic eye disease
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February 7, 2023
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<a href="/about/news-and-events/news?topic=13" hreflang="en">Diabetic Eye Disease</a>
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<a href="/about/news-and-events/news?topic=42" hreflang="en">Macular Edema</a>
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<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2023-02/Maturi-patient.jpg?itok=aMZzSY1y" alt="Raj Maturi sits with patient, holding a series of photos of increasing clarity." width="600" height="400">
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<p>Raj Maturi, M.D., with a patient. Images illustrate vision improvement with treatment for diabetic retinopathy. Image credit: Raj Maturi.</p>
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<p>While early treatment of diabetes-related eye disease slowed progression to severe disease, it did not improve visual acuity compared with treating more severe disease once it developed, according to a clinical study from the DRCR Retina Network. The study was funded by the National Eye Institute (NEI), part of the National Institutes of Health.</p><p>“This study indicates that monitoring patients regularly for vision-threatening diabetes complications and treating eyes only as needed is the best approach,” said Raj Maturi, M.D., Indiana University School of Medicine and Retina Partners Midwest, who is the protocol chair for the four-year study. The report was published today in the Journal of the American Medical Association (JAMA).</p><p>Anti-vascular endothelial growth factor (anti-VEGF) drugs can substantially decrease the risk of vision loss from diabetic retinopathy. However, eye care providers have been unsure when treatment should start to achieve the best long-term outcome. Anti-VEGF is given by injection into the eye, so physicians must weigh the risks for side effects and the expense and inconvenience of treatment against potential treatment benefit.</p><p>Diabetic retinopathy occurs when diabetes affects the blood vessels of the eye’s light-sensing retina. In early stages, diabetes weakens retinal blood vessels, causing fluid to leak into the surrounding retina. This stage is called non-proliferative diabetic retinopathy (NPDR). Fluid buildup in the retina, called diabetic macular edema, is a complication of diabetic retinopathy and can lead to vision loss. Progression of the disease to proliferative diabetic retinopathy (PDR), where new, abnormal blood vessels begin to grow in the retina, can also threaten vision.</p><p>NEI-funded researchers evaluated whether treating people with NPDR with the anti-VEGF drug Eylea (aflibercept) could prevent vision loss. The study enrolled 328 participants, with 399 study eyes (some participants had two eyes that met criteria for enrollment in the study; others only had one study-eligible eye). Preventive anti-VEGF injections were given in 200 eyes at one month after enrollment, two months, and four months, and then every four months over two years. Preventative treatment continued every four months through four years unless NPDR improved to only mild disease. Sham injections (without drug) were used in 199 eyes over the same period. Any eye that developed a vision-threatening complication, such as macular edema or PDR was treated with additional anti-VEGF injections as necessary.</p><p><a href="/about/news-and-events/news/preventive-treatment-reduces-diabetic-retinopathy-complications">Two-year results of the study</a> suggested that while preventive treatment reduced the risk of developing diabetic macular edema or PDR, there was no evident benefit to vision. These final, four-year results reinforce the earlier finding, with no statistical difference in either visual acuity or rates of vision loss between the two groups.</p><p>“We expected early treatment to prevent progression of diabetic retinopathy, but even with preventative injections, about one-third of eyes developed vision-threatening complications,” said Adam Glassman, Jaeb Center for Health Research, Tampa, Florida, who directs the DRCR Retina Network coordinating center.</p><p>Over the four-year study, 34% percent of eyes receiving preventive treatments showed disease progression, compared with 57% of those in the sham group. On average, those in the preventive group received 11 injections, compared with an average of three in the sham group.</p><p>“While the individual risk of complications per injection is low, the risk increases with each additional injection,” said Jennifer Sun, M.D., M.P.H., Joslin Diabetes Center, Harvard Medical School, Boston, and chair of diabetes initiatives for the DRCR Retina Network. “The results of this study indicate that the anatomic benefit from early anti-VEGF treatment does not result in improved visual acuity, and so it may not be worth the risk and inconvenience to the patient of repeat preventive injections for NPDR.”</p><p>The Clinicaltrials.gov identifier for this study is <a href="https://www.clinicaltrials.gov/ct2/show/NCT02634333">NCT02634333</a>. The study was supported by NEI and the National Institute of Diabetes and Digestive and Kidney Diseases, with funding through the Special Diabetes Program, through a cooperative agreement (EY14231). Regeneron provided aflibercept for the study and funds to DRCR Retina Network to defray the study’s clinical site costs. JDRF also provided funds to defray clinical site costs.</p><p>Reference: Maturi RK, Glassman AR, Josic K, Baker CW, Gerstenblith AT, Jampol LM, Meleth A, Martin DF, Melia M, Punjabi OS, Rofagha S, Salehi-Had, H, Stockdale CR, and Sun JK, for the DRCR Retina Network. “Four-Year Visual Outcomes in a Randomized Trial of Intravitreous Aflibercept for Prevention of Vision Threatening Complications of Diabetic Retinopathy (Protocol W).” JAMA. February 7, 2023.</p><p>###</p><p>NEI leads the federal government’s research on the visual system and eye diseases. NEI supports basic and clinical science programs to develop sight-saving treatments and address special needs of people with vision loss. For more information, visit <a href="/">https://www.nei.nih.gov</a>.</p><p>About the National Institutes of Health (NIH): NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit <a href="https://www.nih.gov/">https://www.nih.gov/</a>.</p><p>NIH…Turning Discovery Into Health®</p>
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