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Combination Therapy for Choroidal Neovascularisation

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Abstract

Choroidal neovascularisation (CNV) often leads to severe vision loss and is becoming increasingly prevalent as the aging population grows. Age-related macular degeneration (AMD) is the most common cause of CNV, but CNV also affects younger people with pathological myopia, ocular histoplasmosis syndrome, angioid streaks and idiopathic disorders. The monotherapies available worldwide to treat patients with CNV have primarily been studied in CNV due to AMD, and all have their drawbacks. Combination therapy takes advantage of the strengths of each therapy and their different mechanisms of action to achieve good treatment outcomes with few repeated treatments. For example, combination (triple) therapy with verteporfin photodynamic therapy, anti-vascular endothelial growth factor (VEGF) therapy and anti-inflammatory therapy addresses three main targets of CNV development: the CNV itself, VEGF expression (which promotes CNV growth) and inflammation (which exacerbates the disease process). Such triple therapy has been shown to result in sustained improved vision after only one treatment. Vision outcomes similar to those observed with ranibizumab, the most promising and rigorously proven anti-VEGF monotherapy, may be possible with combination therapy without the need for continued monthly intravitreal injections, which are required if sustained outcomes are to be achieved with ranibizumab. The goal of CNV therapy is improved vision outcomes after one course of treatment. Combination therapy may lead to this goal. Such treatment could also result in fewer safety issues (fewer treatments are required and the unknown effects of continued long-term treatment are avoided), lower cost to both the patient and the medical system and greater convenience for patients (fewer clinic visits). However, combination therapy is beset with several challenges: different therapies, doses, timing and treatment sequences are possible, and it is therefore difficult to conduct large, definitive clinical trials to determine which treatment regimen is safest and most effective. Large controlled studies are needed to more clearly define effective and safe combination regimens for CNV.

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Acknowledgements

No sources of funding were used to assist in the preparation of this article. The authors have no proprietary interest in the therapies discussed. Dr Augustin has acted as a consultant to and received honoraria from Novartis and QLT, and has received research grants from Alcon, Novartis and QLT. Dr Offermann has acted as a consultant to QLT. Assistance with manuscript preparation was provided by Laurie Haynes, ELS, of QLT.

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Augustin, A.J., Offermann, I. Combination Therapy for Choroidal Neovascularisation. Drugs Aging 24, 979–990 (2007). https://doi.org/10.2165/00002512-200724120-00002

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