ABSTRACT

PURPOSE: To investigate the efficacy of vascular endothelial growth factor-specific (VEGF) monoclonal antibodies in the treatment of choroidal neovascularization secondary to age-related macular degeneration (AMD) that does not extend beneath the foveal center (nonsubfoveal CNV). METHODS: The study design was a retrospective chart review of consecutive patients over a two-month period under active treatment with bevacizumab and/or ranibizumab for neovascular AMD. Patients with neovascularization within the macula that did not extend beneath the center of the foveal avascular zone, along with at least one large drusen (>125 µ) or many intermediate size (63-124 µ) drusen were included. Best corrected Snellen visual acuity and optical coherence tomography (OCT) analysis of the central macular thickness was recorded for each visit. Serial injections of bevacizumab and/or ranibizumab were administered until there was resolution of subretinal fluid clinically or by OCT. Data over the entire follow-up period were analyzed for overall visual acuity and OCT changes. All patients had follow-up since diagnosis of at least 6 months (mean=9.6 months). RESULTS: Of the thirteen included patients, eleven had reduction of retinal thickening in the area involved by the CNV. The remaining two patients did not have OCT data available but had no fluid or activity on clinical examination at last follow-up. One patient (8%) lost one line of vision; one (8%) remained stable, and eleven (84%) gained one or more lines of visual acuity. Three patients (23%) gained three or more lines. The average treatment outcome for all patients was a gain of 1.7 ± 1.3 lines of Snellen acuity. Both therapeutic agents were effective, with an average gain of 1.6 ± 0.6 lines for patients treated with bevacizumab, 1.5 ± 1.9 lines gained for patients treated with ranibizumab and 2.5 ± 0.7 lines gained in the two patients who received both agents over the course of their treatment. CONCLUSIONS: The use of intravitreal anti-VEGF agents for nonsubfoveal CNV in AMD is effective. Our results are comparable to published results from large-scale trials of anti-VEGF therapy for subfoveal CNV. Our data support the idea that bevacizumab or ranibizumab appear to be the treatment of choice for AMD patients with nonsubfoveal CNV.

Keywords: Choroidal neovascularization; Macular degeneration; Antibodies, monoclonal; Angiogenesis inhibitors; Visual acuity

RESUMO

OBJETIVO: Investigar a eficácia dos anti-angiogênicos ranibizumab e bevacizumab injetados intravítreo, no tratamento de pacientes com neovascularização de coróide extrafoveal em degeneração macular relacionada à idade. MÉTODOS: Foram avaliados 13 pacientes com neovascularização de coróide extrafoveal em degeneração macular relacionada à idade do Setor de Retina e Vítreo do Departamento de Oftalmologia da Universidade de Iowa, Estados Unidos, que foram tratados por meio de injeção vítrea de ranibizumab e bevacizumab separadamente, em um período de dois anos. Após as injeções iniciais os pacientes foram acompanhados por exames de OCT e as injeções foram repetidas com 4 a 8 semanas dependendo da presença de líquido sub-retiniano e macular. RESULTADOS: Doze pacientes tiveram ganhos de linhas de visão se comparados com a visão antes do tratamento. Onze pacientes tiveram redução do espessamento retiniano na área envolvida pelo CNV e diminuição e resolução do espessamento macular na sua visita final de avaliação. Um paciente (8%) perdeu uma linha de visão se comparado à visão prévia ao tratamento. Pacientes tratados com o ranibizumab tiveram em média 2,5 ± 0,7 ganhos de linhas de visão. Pacientes tratados com bevacizumab tiveram em média 1,6 ± ganhos de linhas de visão. CONCLUSÃO: No tratamento de pacientes com a neovascularização de coróide extrafoveal em degeneração macular relacionada à idade, a injeção vítrea de ranibizumab ou bevacizumab é efetiva e pode ser a opção de escolha.

Descritores: Neovascularização coroidal; Degeneração macular; Anticorpos monoclonais; Inibidores da angiogênese; Acuidade visual

ORIGINAL ARTICLE

 

Intravitreal ranibizumab and bevacizumab for the treatment of nonsubfoveal choroidal neovascularization in age-related macular degeneration

 

Ranibizumab e bevacizumab intravítreo no tratamento da neovascularização de coróide extrafoveal da degeneração macular relacionada à idade

 

 

Aaron Brock Roller^I; Miguel Hage Amaro^II

^IDepartment of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City, IA - USA
IIDepartment of Ophthalmology, Federal University of São Paulo - UNIFESP, São Paulo (SP) - Brazil

Correspondence address

 

 

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ABSTRACT

PURPOSE: To investigate the efficacy of vascular endothelial growth factor-specific (VEGF) monoclonal antibodies in the treatment of choroidal neovascularization secondary to age-related macular degeneration (AMD) that does not extend beneath the foveal center (nonsubfoveal CNV).
METHODS: The study design was a retrospective chart review of consecutive patients over a two-month period under active treatment with bevacizumab and/or ranibizumab for neovascular AMD. Patients with neovascularization within the macula that did not extend beneath the center of the foveal avascular zone, along with at least one large drusen (>125 µ) or many intermediate size (63-124 µ) drusen were included. Best corrected Snellen visual acuity and optical coherence tomography (OCT) analysis of the central macular thickness was recorded for each visit. Serial injections of bevacizumab and/or ranibizumab were administered until there was resolution of subretinal fluid clinically or by OCT. Data over the entire follow-up period were analyzed for overall visual acuity and OCT changes. All patients had follow-up since diagnosis of at least 6 months (mean=9.6 months).
RESULTS: Of the thirteen included patients, eleven had reduction of retinal thickening in the area involved by the CNV. The remaining two patients did not have OCT data available but had no fluid or activity on clinical examination at last follow-up. One patient (8%) lost one line of vision; one (8%) remained stable, and eleven (84%) gained one or more lines of visual acuity. Three patients (23%) gained three or more lines. The average treatment outcome for all patients was a gain of 1.7 ± 1.3 lines of Snellen acuity. Both therapeutic agents were effective, with an average gain of 1.6 ± 0.6 lines for patients treated with bevacizumab, 1.5 ± 1.9 lines gained for patients treated with ranibizumab and 2.5 ± 0.7 lines gained in the two patients who received both agents over the course of their treatment.
CONCLUSIONS: The use of intravitreal anti-VEGF agents for nonsubfoveal CNV in AMD is effective. Our results are comparable to published results from large-scale trials of anti-VEGF therapy for subfoveal CNV. Our data support the idea that bevacizumab or ranibizumab appear to be the treatment of choice for AMD patients with nonsubfoveal CNV.

Keywords: Choroidal neovascularization/drug therapy; Macular degeneration/drug therapy; Antibodies, monoclonal; Angiogenesis inhibitors; Visual acuity

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RESUMO

OBJETIVO: Investigar a eficácia dos anti-angiogênicos ranibizumab e bevacizumab injetados intravítreo, no tratamento de pacientes com neovascularização de coróide extrafoveal em degeneração macular relacionada à idade.
MÉTODOS: Foram avaliados 13 pacientes com neovascularização de coróide extrafoveal em degeneração macular relacionada à idade do Setor de Retina e Vítreo do Departamento de Oftalmologia da Universidade de Iowa, Estados Unidos, que foram tratados por meio de injeção vítrea de ranibizumab e bevacizumab separadamente, em um período de dois anos. Após as injeções iniciais os pacientes foram acompanhados por exames de OCT e as injeções foram repetidas com 4 a 8 semanas dependendo da presença de líquido sub-retiniano e macular.
RESULTADOS: Doze pacientes tiveram ganhos de linhas de visão se comparados com a visão antes do tratamento. Onze pacientes tiveram redução do espessamento retiniano na área envolvida pelo CNV e diminuição e resolução do espessamento macular na sua visita final de avaliação. Um paciente (8%) perdeu uma linha de visão se comparado à visão prévia ao tratamento. Pacientes tratados com o ranibizumab tiveram em média 2,5 ± 0,7 ganhos de linhas de visão. Pacientes tratados com bevacizumab tiveram em média 1,6 ± ganhos de linhas de visão.
CONCLUSÃO: No tratamento de pacientes com a neovascularização de coróide extrafoveal em degeneração macular relacionada à idade, a injeção vítrea de ranibizumab ou bevacizumab é efetiva e pode ser a opção de escolha.

Descritores: Neovascularização coroidal/quimioterapia; Degeneração macular/quimioterapia; Anticorpos monoclonais; Inibidores da angiogênese; Acuidade visual

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INTRODUCTION

Landmark studies have shown that the vascular endothelial growth factor-specific (VEGF) monoclonal antibodies bevacizumab and ranibizumab are currently the best treatments for patients with age-related macular degeneration (AMD) and subfoveal choroidal neovascularization (CNV)^(1-6). Except for a single case report, the studies reported on patients whose neovascularization extended beneath the center of the foveal avascular zone⁽⁷⁾.

The Macular Photocoagulation Studies showed that laser photocoagulation was effective in reducing vision loss in patients with extrafoveal CNV (>200 µm from the foveal center) and juxtafoveal CNV (1-199 µm from the foveal center), but the effect was limited to eyes with classic CNV lesions^(8-11). Problems with thermal laser treatment include damage to the fovea and a high recurrence rate of CNV after treatment. Thermal laser treatment can however potentially eradicate CNV, preventing the need for repeated injections of a VEGF inhibitor. Evidence for the use of PDT for the treatment of extrafoveal and juxtafoveal CNV associated with AMD has also been published, but is limited and has had highly variable results^(12-15).

 

Figura 1

 

 

Figura 2

 

AMD patients with non-subfoveal CNV need prompt treatment to avoid macular damage from fluid, hemorrhage, or scarring from extension of the CNV into the fovea. Anti-VEGF therapy offers the promise of effectively treating the neovascular process while causing less damage than thermal laser. Herein we present data from a series of patients with AMD and vision loss from CNV that did not extend beneath the fovea who were treated with bevacizumab and/or ranibizumab. We compare these results with those from the Macular Photocoagulation Studies.

 

METHODS

This study was approved by the Human Subjects Review Committee of The University of Iowa Hospitals and Clinics. Patients were collected from the practice of Dr. James Folk at The University of Iowa. Every patient under active treatment with either bevacizumab or ranibizumab for neovascular AMD during the consecutive two month period from May 2008 to June 2008 was potentially eligible. A retrospective chart review was performed for all included patients. Fundus fluorescein angiography (FFA) obtained at the time of initial presentation was reviewed to confirm the diagnosis of AMD and to determine if the choroidal neovascularization extended beneath the center of the fovea. Inclusion criteria included neovascularization within the macula that did not extend beneath the center of the foveal avascular zone (FAZ), along with at least one large drusen (>125 µ) or many intermediate size (63-124 µ) drusen. Specific exclusion criteria included: geographic atrophy of the RPE that involved the fovea, fundus changes compatible with myopic degeneration, angioid streaks, chorioretinal scars in the macula which could indicate choroidal inflammatory disease, or history of any previous treatment for CNV or any other retinal disease in the treatment eye.

The distance of the closest point of either the occult or classic neovascularization to the center of the FAZ was measured in microns using software on the digital photographic system. In general a mid-phase image of the angiogram was used when the neovascularization was completely filled but had not yet leaked sufficiently to obscure its margins. Using criteria from the MPS, choroidal neovascularization was considered to be extrafoveal if its closest point did not extend closer than 200 µ to the center of the FAZ, and was classified as juxtafoveal if the closest point was closer than 200 µ to the center but did not extend under the center of the FAZ. The determination of whether the neovascularization was predominantly classic or occult was made using previously reported criteria⁽¹²⁾.

Patients were examined at 4-8 week intervals. At each visit, best corrected Snellen visual acuity was measured and Stratus optical coherence tomography (OCT) was performed and evaluated for the presence of intraretinal or subretinal fluid. The central macular thickness as determined by OCT was recorded. Repeat injections were performed until no subretinal or intraretinal fluid was seen on the OCT, at which time they were considered an "anatomic success." Two of the thirteen patients were not followed with OCT imaging but instead by their symptoms, visual acuity, and careful examination of the macula. Per our customary practice to prevent recurrence, all patients were treated with additional injections even after they exhibited resolution of subretinal fluid but the treatment interval was gradually extended to up to 6 months. All patients had at least 6 months of follow-up since diagnosis, and the mean total follow-up time was 9.6 months.

 

RESULTS

The review resulted in 13 patients who met the criteria, none of whom were excluded. Mean patient age was 81 (±6.8) years (Table 1). Seven patients had classic lesions, three had occult and three predominately occult CNV. Of the 13 patients, nine (69%), had extrafoveal CNVand four, (31%), had juxtafoveal CNV.

Seven patients were initially treated with an intravitreal injection of 1.25 mg bevacizumab and six were treated initially with 0.5mg of ranibizumab. Two of the thirteen patients received both agents at different points over the course of their treatment. Mean visual acuity at the time of diagnosis was 20/60 (logMAR 0.5, ± 0.28).

Follow-up ranged from 6-24 months (Mean=9.6). The results were determined from data collected at the last visit. The total number of injections averaged 5 (±2.6). Eleven patients had reduction of retinal thickening in the area involved by the CNV and the average central macular thickness reduction after treatment was 78 ± 69 microns. The other two patients who did not have OCT data had no fluid or activity on clinical examination. No patient had increased central macular thickness on OCT as of the last follow-up.

At the final follow-up visit, one patient (8%) had lost one line of vision since the beginning of treatment; one (8%) had remained stable, and eleven (84%) had gained one or more lines of visual acuity (Table 2). Three patients (23%) gained three or more lines. The average treatment outcome for all patients was a gain of 1.7 ± 1.3 lines of Snellen acuity (Table 1, 2). Both therapeutic agents were effective, with an average gain of 1.6 ± 0.6 lines for patients treated with bevacizumab, 1.5 ± 1.9 lines gained for patients treated with ranibizumab and 2.5 ± 0.7 lines gained in the two patients who received both agents over the course of their treatment. This study was too small to calculate statistically significant differences in treatment outcomes between the extrafoveal and juxtafoveal groups, the different CNV lesion types, or between the therapeutic agent used. However, results in all subgroups appeared similarly favorable. All of the 13 patients responded to treatment evident by resolution of retinal or subretinal edema on OCT, visual improvement or clinical resolution of hemorrhage and edema associated with CNV.

 

DISCUSSION

The results of this small series of nonsubfoveal CNV in patients with AMD are similar to the visual results of the large MARINA and ANCHOR trials for subfoveal CNV (Table 3). As demonstrated in these trials, both occult and classic neovascularization responded to anti-VEGF therapy in our patients. A slightly greater proportion of our patients had 20/40 or better acuity, probably because there was no subfoveal scarring. We also attempted to compare our results with the MPS studies which used argon laser to treat extrafoveal CNV and krypton red laser to treat juxtafoveal CNV (Table 4). While our results seem favorable, a comparison of different patient groups from different studies and different decades is impossible to interpret in a scientific manner. A prospective, randomized controlled trial is needed to confirm our results.

Bevacizumab and/or ranibizumab was successful at controlling the CNV in all of our study patients. Only one of the 13 patients in this study lost one line of vision, one remained stable, and the other 11 had visual improvement. Seventy percent had 20/40 or better vision at last follow-up. Based on the results of this small series, bevacizumab or ranibizumab appear to be the treatment of choice for AMD patients with nonsubfoveal CNV. The exception could be the patient who has a CNV far from the fovea and who does not want repeated intravitreal injections. Our results are encouraging and deserve further investigation with a larger prospective trial.

 

ACKNOWLEDGEMENTS

We thank Dr. James C. Folk, Judith (Gardner) and Donald H. Beisner, M.D. Professor of Vitreoretinal Diseases and Surgery at the University of Iowa in Iowa City, Iowa USA for his generous help with the design and completion of this study.

 

 

REFERENCES

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Correspondence address:
Aaron Brock Roller
Department of Ophthalmology University of Iowa 200 Hawkins Drive
Iowa City, IA 52242 USA
E-mail: [email protected]

Recebido para publicação em 11.09.2008
Última versão recebida em 27.09.2009
Aprovação em 29.09.2009

 

 

Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City, IA - USA.