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      Resolution of Refractory Corneal Neovascularization with Subconjunctival Bevacizumab

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          Abstract

          Corneal neovascularization (CNV) has a variety of causes and threatens corneal clarity, thus optimal visual acuity. Conventional medical management includes topical steroids and matrix metalloproteinase inhibitors like doxycycline. Anti-vascular endothelial growth factor (anti-VEGF) agents have demonstrated promise but remain off-label for this indication. However, these agents hold value in cases refractory to first-line medical management. We report the case of a 63-year-old woman who presented with ocular rosacea and CNV affecting vision, on a background of acne rosacea. She was initially treated with fluorometholone and doxycycline, yet continued to deteriorate. Eventually she received two 1.5-mg subconjunctival injections of bevacizumab 2 months apart. CNV completely resolved and results were maintained at 4-year follow-up. This case demonstrates that refractory CNV can be effectively treated with subconjunctival injection of anti-VEGF bevacizumab. The resolution of CNV was also maintained years after injection with minimal adjunctive therapy during this period, and to our knowledge there are no other studies reporting a follow-up period of 4 years after treatment. This is a pertinent case for other clinicians treating patients in a similar situation.

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          Most cited references12

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          Corneal neovascularization: updates on pathophysiology, investigations & management

          Objective. Corneal neovascularization is a sight-threatening condition affecting more than 1.4 million people per year. Left untreated, it can lead to tissue scarring, oedema, lipid deposition, and persistent inflammation that may significantly affect visual prognosis and quality of life. The aim was to review the recent evidence relating to the pathophysiology, investigations and management of corneal neovascularization. Methods. Literature review of prospective and retrospective studies, clinical trials and animal models relating to the pathophysiology, investigation and management of corneal neovascularization. Results. Corneal neovascularization is characterized by the invasion of new blood vessels into the cornea caused by an imbalance between angiogenic and antiangiogenic factors that preserve corneal transparency as a result of various ocular insults and hypoxic injuries. Risk factors that have been implicated in the pathogenesis of the disease include contact lens wear, ocular surface disease, trauma, previous surgery and herpes. The results highlighted the current and future management modalities of corneal neovascularization, which includes corneal transplantation, laser - phototherapy, injections and topical treatment. Conclusion. The future of corneal neovascularization is promising and this paper discusses the upcoming revolution in local gene therapy. Abbreviations. HSK = herpes stromal keratitis, VEGF = vascular endothelial growth factor, VEGFR-1 = VEGF Receptor-1, FGF = Fibroblast growth factor, PDGF = Platelet-derived growth factor, IL-6 = interleukin-6, IL-7 = interleukin-7, IL-8 = interleukin-8, IRS-1 = insulin receptor substrate-1
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            The different effects of early and late bevacizumab (Avastin) injection on inhibiting corneal neovascularization and conjunctivalization in rabbit limbal insufficiency.

            To compare the effects of early, mid, and late subconjunctival injection of bevacizumab on corneal neovascularization (NV) and conjunctivalization in a rabbit limbal insufficiency model. Limbal insufficiency was created surgically, and subconjunctival injections of 2.5 mg bevacizumab twice weekly for 1 month were started immediately (early group), 1 week (mid group), and 1 month after injury (late group). The corneal epithelial alterations, stromal opacity, centricity, extent, and PICS (percentage of involved corneal surface) of the corneal NV were evaluated. The expression of cytokeratins K3, K4, K12, K13, and MUC5 by the corneal surface cells was examined by immunohistochemistry. Bevacizumab significantly inhibited corneal NV in the early and mid, but not the late, treatment groups at 4 weeks after treatment (PICS: P 0.05 in the late group). Early and mid treatment produced significant inhibition of corneal alteration (P < 0.01 in the early group and P = 0.03 in the mid group) and stromal opacity (P < 0.01 in the early group and P = 0.02 in the mid group) at 4 months after treatment but not in the late group. The immunohistochemistry of cytokeratin on the corneal surface cells at 1 month after treatment was K3(+), K4(-), K12(+), K13(-), and MUC5(-) in the early group; K3(+), K4(+), K12(+), K13(+), and MUC5(-) in the mid group; and K3(+), K4(+), K12(-), K13(+), and MUC5(+) in the late treatment group. Early and mid bevacizumab injection inhibited corneal NV, epithelial alteration, and stromal opacity in limbal insufficiency, but late treatment did not. Early treatment with bevacizumab seems to be clinically beneficial in the management of limbal injury such as chemical burn.
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              Treatment of Corneal Neovascularization Using Anti-VEGF Bevacizumab

              Purpose. To evaluate antiangiogenic effect of local use of bevacizumab (anti-VEGF antibody) in patients with corneal neovascularization. Methods. Patients were divided into two groups. All patients suffered from some form of corneal neovascularization (NV). Patients in group A received 0.2–0.5 mL of bevacizumab solution subconjunctivally (concentration 25 mg/mL) in a single dose. Group A included 28 eyes from 27. Patients in group B applied bevacizumab eye drops twice daily (concentration 2.5 mg/mL) for two weeks. Group B included 38 eyes from 35 patients. We evaluated the number of corneal segments affected by NV, CDVA, and the incidence of complications and subjective complaints related to the treatment. The minimum follow-up period was six months. Results. By the 6-month follow-up, in group A the percentage reduction of the affected peripheral segments was 21.6% and of the central segments was 9.6%; in group B the percentage reduction of the central segments was 22.7% and of the central segments was 38.04%. In both groups we noticed a statistically significant reduction in the extent of NV. Conclusion. The use of bevacizumab seems to be an effective and safe method in the treatment of corneal neovascularization, either in the subconjunctival or topical application form.
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                Author and article information

                Journal
                Case Rep Ophthalmol
                Case Rep Ophthalmol
                COP
                Case Reports in Ophthalmology
                S. Karger AG (Allschwilerstrasse 10, P.O. Box · Postfach · Case postale, CH–4009, Basel, Switzerland · Schweiz · Suisse, Phone: +41 61 306 11 11, Fax: +41 61 306 12 34, karger@karger.com )
                1663-2699
                Sep-Dec 2020
                7 December 2020
                7 December 2020
                : 11
                : 3
                : 652-657
                Affiliations
                Eye Surgery Associates, Orange, New South Wales, Australia
                Author notes
                *Anna Krystyna Britton, Eye Surgery Associates, 126–130 Kite Street, Orange, NSW 2800 (Australia), annakbritton@ 123456gmail.com
                Article
                cop-0011-0652
                10.1159/000510114
                7772892
                33442379
                c3800c2e-e402-4332-b3eb-baef4344345d
                Copyright © 2020 by S. Karger AG, Basel

                This article is licensed under the Creative Commons Attribution-NonCommercial-4.0 International License (CC BY-NC) (http://www.karger.com/Services/OpenAccessLicense). Usage and distribution for commercial purposes requires written permission.

                History
                : 9 May 2020
                : 10 July 2020
                : 2020
                Page count
                Figures: 1, References: 12, Pages: 6
                Categories
                Case Report

                corneal neovascularization,bevacizumab,anti-vascular endothelial growth factor

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