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The most common reason intravitreal injections are used is to administer anti-vascular endothelial growth factor (anti-VEGF) therapies to treat wet age related macular degeneration (AMD) and diabetic retinopathy. Both of these conditions cause damage to the retina leading to vision loss.
Diabetic retinopathy (also known as diabetic eye disease) is a medical condition in which damage occurs to the retina due to diabetes.It is a leading cause of blindness in developed countries and one of the lead causes of sight loss in the world, even though there are many new therapies and improved treatments for helping people live with diabetes.
Intravitreal injection is the method of administration of drugs into the eye by injection with a fine needle. The medication will be directly applied into the vitreous humor. [1] It is used to treat various eye diseases, such as age-related macular degeneration (AMD), diabetic retinopathy, and infections inside the eye such as endophthalmitis. [1]
Ranibizumab, sold under the brand name Lucentis among others, is a monoclonal antibody fragment created from the same parent mouse antibody as bevacizumab.It is an anti-angiogenic [16] that is approved to treat the "wet" type of age-related macular degeneration (AMD, also ARMD), diabetic retinopathy, and macular edema due to branch retinal vein occlusion or central retinal vein occlusion.
By May 2012, anti-VEGF treatment with Avastin has been accepted by Medicare, is quite reasonably priced, and effective. Lucentis has a similar but smaller molecular structure to Avastin, and is FDA-approved (2006) for treating MacD, yet remains more costly, as is the more recent (approved in 2011) aflibercept (Eylea). Tests on these treatments ...
A 2017 review update studying the effects of anti-VEGF drugs on diabetic macular edema found that while all three studied treatments have advantages over laser therapy, there was moderate evidence that aflibercept is significantly favored in all measured efficacy outcomes over ranibizumab and bevacizumab, after one year, longer term advantages ...
Intravitreal injections are already commonly used for administering drugs like anti-VEGF agents, making the procedure familiar to clinicians and safer for patients. The eye's immune-privileged status reduces the likelihood of immune responses to the viral vector, increasing the therapy's safety profile.
[1] [8] Faricimab is the first bispecific monoclonal antibody [9] to target both vascular endothelial growth factor (VEGF) [1] and angiopoietin 2 (Ang-2). [1] By targeting these pathways, faricimab stabilizes blood vessels in the retina. [9] It is given by intravitreal injection (injection into the eye) by an ophthalmologist. [1]
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