Choroidal Neovascularization Treatment & Management
- Author: Lihteh Wu, MD; Chief Editor: Hampton Roy, Sr, MD more...
Current knowledge of molecular events in the pathogenesis of choroidal neovascularization (CNV) has allowed CNV to be targeted with very specific antiangiogenic factors. Targeting VEGF allows a two-hit strategy: antiangiogenesis and antipermeability. VEGF is 50,000 times more potent than histamine in inducing vascular permeability. An important component of decreased vision is the accumulation of subretinal fluid secondary to increased vascular permeability.
The major limitation of anti-VEGF treatment is the injection burden. Most patients require multiple injections. Therefore, a number of different protocols are looking at combining photodynamic therapy, corticosteroids, and anti-VEGF drugs.[3, 4, 5, 6, 7]
Currently, the treatment of choice for CNV secondary to exudative ARMD is intravitreal anti-VEGF therapy. A reduced biological response to both intravitreal ranibizumab and bevacizumab has been reported by several authors.[19, 20, 21, 22, 23, 24] A distinction between tachyphylaxis and drug tolerance should be made. Tachyphylaxis refers to the loss of drug effectiveness following repetitive use during a short period of time. In general, drug effectiveness is restored after a short drug holiday. In contrast, drug tolerance develops slowly over time. Increasing the drug dosage or shortening the dosing interval improves its effectiveness. A drug holiday does not restore its effectiveness.
Several mechanisms have been proposed to explain these phenomena. VEGF blockade may lead to an increase in other angiogenic signaling pathways as a compensatory mechanism. Up-regulation of VEGF production by macrophages within CNV has also been proposed. Anti-bevacizumab and anti-ranibizumab auto-antibodies have been documented in the systemic circulation of patients undergoing chronic anti-VEGF therapy for exudative AMD. These auto-antibodies may neutralize the effect of anti-VEGF agents. } CNV lesion composition might change with time with more mature and therefore less VEGF sensitive vessels.[21, 26]
A retrospective case series reported that tachyphylaxis occurred in 5 of the 59 patients treated with intravitreal bevacizumab. In this study, the median time to develop tachyphylaxis with intravitreal bevacizumab was 100 weeks, with a median number of 8 intravitreal injections. Another retrospective case series identified tachyphylaxis in 2% of patients being treated with ranibizumab.
Several strategies, including drug holidays, increasing the drug dosage, combination therapy, and switching from one anti-VEGF drug to another anti-VEGF agent, have been advocated to counteract these phenomena.[21, 22, 24, 25] Gasperini and colleagues showed that in 81% of cases, the switch from ranibizumab to bevacizumab and vice versa was at least somewhat effective in further reducing subretinal fluid.
Several other antiangiogenic compounds are currently in different stages of development. These agents include genetic therapy with vectors carrying anti-angiogenics, si (small interference) RNA-VEGF, and combretastatin A4.
Pegaptanib sodium 
Pegaptanib sodium is an aptamer against VEGF165, the isoform identified with pathological angiogenesis. An aptamer is an oligonucleotide that acts like a high affinity antibody to VEGF, neutralizing it before it can contact its receptor.
Pegaptanib sodium is given as an intravitreal injection every 6 weeks.
Overall, pegaptanib sodium was able to decrease visual loss when compared to placebo in a similar fashion to that of PDT therapy with verteporfin. Only 6% of eyes were reported to have an improvement in visual acuity of 3 or more lines after 12 months of follow-up. Unlike therapy with verteporfin, all eyes with exudative ARMD benefited from treatment regardless of lesion composition. In addition, the trials using pegaptanib sodium included eyes with larger lesions than those eyes in the trials using verteporfin.
Complications associated with the intravitreal injection of pegaptanib sodium are few but include retinal detachment and endophthalmitis.
Ranibizumab is a recombinant monoclonal antibody Fab fragment that neutralizes all active forms of VEGF-A.
Ranibizumab is delivered as a monthly intravitreal injection.
The US Food and Drug Administration approved the use of ranibizumab for the treatment of all angiographic subtypes of subfoveal neovascular ARMD.
Intravitreal ranibizumab is the first treatment that significantly improves visual acuity in up to 40% of eyes. An extension study of patients who completed 1 of 3 different randomized clinical trials of ranibizumab for exudative age-related macular degeneration showed that intravitreal injections of ranibizumab were well tolerated for more than 4 years. However, less frequent follow-up led to fewer injections, which in turn led to a loss of the initial gains in visual acuity.
Although infrequent, complications associated with this treatment include endophthalmitis and severe uveitis.
Bevacizumab is a humanized, recombinant monoclonal immunoglobulin G (IgG) antibody that binds and inhibits all VEGF isoforms and is currently approved for systemic use in metastatic colorectal cancer and non–small cell lung cancer.
Off-label use of intravitreal bevacizumab for CNV secondary to ARMD was first reported in 2005. Most of the reports of bevacizumab are uncontrolled, open-label case series that have suggested functional and anatomical efficacy, short-term safety, and low cost.
Results from several studies suggest that bevacizumab may be useful in the treatment of CNV secondary to multiple etiologies including myopia, angioid streaks, inflammatory conditions,[34, 35] and ARMD.[36, 37]
A retrospective study reported findings in 180 patients with choroidal neovascularization secondary to age-related macular degeneration who were injected with either 1.5 mg or 2.5 mg and were followed for a minimum of 24 months. An average of 5 injections using a PRN protocol demonstrated improvement or stability in vision. No statistically significant differences between doses were noted.
The VIEW 1 and VIEW 2, two similarly designed double-masked, randomized multicenter clinical trials, demonstrated that intravitreal aflibercept dosed monthly or every 2 months after a loading dose of 3 monthly doses was noninferior to monthly ranibizumab.
See the list below:
The Macular Photocoagulation Study (MPS) proved the efficacy of laser photocoagulation in the treatment of CNV secondary to ARMD, POHS, and idiopathic causes.
The goal is to completely obliterate CNV.
Partial treatment of CNV is not beneficial when compared to observation.
- Extrapolate these results to other conditions that are complicated by CNV on a case-by-case basis. Many patients and their physicians choose not to elect immediate loss or several lines of vision in an attempt to have a very modest visual improvement in 18 months.
- Extrapolation of MPS results to CNV secondary to myopia probably is not indicated in juxtafoveal CNV.
- Cases of enlargement of laser scars through the fovea with subsequent visual loss have been reported.
PDT uses light-activated drugs and nonthermal light to achieve selective destruction of CNV with minimal effects on the surrounding normal tissues.
- Randomized clinical trials have shown that PDT with verteporfin is effective in reducing visual loss in certain eyes with CNV secondary to ARMD.
- In eyes with at least some classic CNV, treatment with verteporfin reduced visual loss. Subgroup analysis revealed that eyes with a classic component of greater than 50% fared much better than those eyes with a classic component of less than 50%. In eyes with a classic component of less than 50%, no difference existed in visual loss between the eyes treated with placebo and the eyes treated with verteporfin.
- Another study reported that therapy with verteporfin for occult CNV secondary to ARMD was effective in slowing the progression of visual loss. However, such benefit was only seen after the second year of follow-up. Subgroup analysis revealed that eyes with a visual acuity of 20/50 or worse or eyes with lesions smaller than 4 disc areas in size had a better outcome. Further analysis of the data revealed that lesion size rather than lesion composition is a strong predictor of visual benefit following PDT with verteporfin.
- Despite all the encouraging initial results, PDT provides marginal benefit. Most eyes will continue losing vision, though at a slower rate, and only 15% of eyes will manifest some visual improvement.
- PDT in combination with intravitreal triamcinolone, bevacizumab, or ranibizumab may have better visual outcomes than PDT alone in patients with ARMD.
High-speed ICG confocal angiography guided laser photocoagulation of feeder vessels is reportedly beneficial in selected patients with exudative ARMD but remains unproven.
Uncontrolled studies have recommended surgical excision of subfoveal CNV via pars plana vitrectomy. The goal is to remove CNV but to leave the underlying RPE and choriocapillaris intact.
- Surgical excision of type 2 CNV would be more beneficial than type 1 CNV.
- Pilot studies resulted in substantial numbers of patients with worse vision, many with unchanged vision, and a small number with apparent improved vision. The current rhetoric is that stabilization may occur with surgery.
- The Submacular Surgery Trial (SST), a randomized multicenter prospective trial sponsored by the National Eye Institute (NEI), confirmed that submacular surgery in eyes with CNV secondary to ARMD generally does not have a good visual outcome. In addition, with CNV secondary to idiopathic causes and POHS, submacular surgery offers a modest benefit in eyes with a baseline visual acuity of 20/100 or worse.
Two surgical methods to translocate the fovea have been developed to treat subfoveal CNV. The previously subfoveal CNV is now juxtafoveal or extrafoveal; then, standard laser photocoagulation or PDT can be performed without damaging the fovea. Caution is warranted because high rates of retinal detachment, proliferative vitreoretinopathy (PVR), macular holes, recurrent CNV, cystoid macular edema (CME), and hemorrhage have been reported.
Low-dose radiation therapy has been effective in inhibiting neovascularization in different tissues.
- A randomized clinical trial reported better visual outcomes in eyes with exudative ARMD receiving radiation therapy of 24 Gy given in 6 fractions of 4 Gy each compared to observation.
- However, other trials do not support radiation therapy as a treatment alternative in eyes with CNV secondary to ARMD. Long-term effects are unknown, and radiation retinopathy is definitely a concern.
Diagnosis and treatment is often difficult. Consider referring to a retinal specialist who is experienced with these conditions.
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