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Effectiveness of intravitreal ranibizumab in exudative age-related macular degeneration (AMD): comparison between typical neovascular AMD and polypoidal choroidal vasculopathy over a 1 year follow-up
© Matsumiya et al.; licensee BioMed Central Ltd. 2013
- Received: 20 July 2012
- Accepted: 25 March 2013
- Published: 4 April 2013
The effects of intravitreal ranibizumab (IVR) against exudative age-related macular degeneration (AMD) may be different associated with the lesion phenotype. This study was conducted to compare the outcomes of IVR between two different phenotypes of exudative AMD: typical neovascular AMD (tAMD) and polypoidal choroidal vasculopathy (PCV).
This is a retrospective cohort study of 54 eyes from 54 subfoveal exudative AMD patients (tAMD 24, PCV 30 eyes). Three consecutive IVR treatments (0.5 mg) were performed every month, followed by re-injections as needed. Change in the best-corrected visual acuity (BCVA) and central retinal thickness (CRT) were then compared between the tAMD and PCV groups over 12 months of follow-up.
The mean BCVA was significantly improved (-0.11 logMAR units) at month 3 after the initial IVR (p <0 .001, Wilcoxon signed-rank test), and was sustained up to 12 months in all AMD patients (p =0.02). In the subgroup analysis, the tAMD group showed a significant improvement in their mean BCVA (-0.06, -0.17, -0.15 and -0.16 logMAR units at 1, 3, 6 and 12 months, respectively), but there was only a slight but non-significant improvement in the PCV group. The improvement in the BCVA was significantly greater in the tAMD group than in the PCV group (p = 0.043, repeated measures ANOVA) over 12 months. Both phenotypes showed significant improvements in the CRT during 12 months after the initial IVR.
IVR is an effective therapy for tAMD and PCV in the BCVA improvement in Japanese patients over 12 months of follow-up. The phenotype of tAMD showed a significantly better outcome with IVR than PCV in terms of BCVA improvement.
The intravitreal injection of ranibizumab (IVR), an anti-vascular endothelial growth factor (VEGF) agent, is currently the choice of treatment for subfoveal choroidal neovascularization (CNV) due to age-related macular degeneration (AMD), which is a major cause of irreversible blindness in the elderly in industrialized countries [1, 2]. Several studies from Western countries have reported significant improvements in the vision of AMD patients with predominantly classic, minimally classic and occult with no classic lesions. Two pivotal phaseIII clinical studies, the MARINA and ANCHOR studies [3, 4], reported that VA improvements observed with IVR in the first 3 months were sustained and some additional improvement was seen over the trial period. EXTEND-I  in Japanese patients with CNV secondary to AMD also showed the comparable efficacy of IVR with the MARINA and ANCHOR studies. On the other hand, since this protocol was often not feasible, a customized/individualized pro re nata (PRN) dosing regimen of ranibizumab was investigated in order to achieve optimal VA results with fewer monthly injections. As a representative study of the PRN use of ranibizumab, the PrONTO study  proposed a flexible dosing regimen with the OCT and VA- guided criteria for re-treatment. These visual acuity results were similar to those from the MARINA and ANCHOR study . However, the efficacy of IVR has not been well documented for exudative AMD in the Japanese population. A recent report described a good response to intravitreous bevacizumab, an anti-vascular endothelial growth factor (VEGF) antibody in off-label use, in Japanese AMD patients with classic CNV lesions, but there was limited efficacy in those with occult CNV lesions . Those results might be attributed to the proportion of AMD subtypes in the Japanese population, which includes polypoidal choroidal vasculopathy (PCV) as the major phenotype of exudative AMD , and the effects of anti-VEGF therapy for PCV may differ from those for typical neovascular AMD (tAMD). Recent publications have reported that the effects of anti- VEGF therapy were limited in PCV [10, 11], but it is not conclusive whether these phenotypes of AMD are associated with the effectiveness of IVR or not because there were only a few studies which conducted direct comparison in the outcomes of IVR between tAMD and PCV [12, 13]. Since IVR is an expensive treatment and carries the risk of complications such as endophthalmitis, establishing precise indications for IVR is very important for the best benefit/risk ratio and cost performance of this therapy. The different effects of IVR against the different phenotypes may encourage a better selection of cases eligible for this therapy.
In this study, we first evaluated the efficacy of IVR in Japanese exudative AMD patients. Next, we performed a comparative assessment to determine whether the effects of IVR were different between tAMD and PCV in terms of visual acuity and the number of treatments over a 12 months follow-up period.
This is a retrospective interventional cohort study of consecutive case series with exudative AMD treated by IVR. All cases in this study were Japanese individuals recruited from the Department of Ophthalmology at the Kobe University Hospital in Japan and IVR is a standard treatment for exudative AMD at the hospital. This study was approved by the Institutional Review Boards at the Kobe University Graduate School of Medicine, and was conducted in accordance with the Declaration of Helsinki. Written informed consent was obtained from all subjects.
Fifty-four eyes from 54 subfoveal exudative AMD patients (tAMD 24, PCV 30 eyes) who underwent the first IVR between April 2009 and April 2011, with an age over 50 years and the baseline visual acuity between 20/25 and 20/320 , were followed-up for 12 months. All patients received detailed ophthalmic examinations, including best-corrected visual acuity (BCVA) measurements, slit lamp biomicroscopy of their fundi, color fundus photography, fluorescein angiography (FA), indocyanine green angiography (ICGA) and optical coherence tomography (OCT). A detailed questionnaire on the patient’s basic characteristics including age, body weight and height, the presence or absence of hypertension and diabetic mellitus, and any history of smoking (current, past or non-smoker) was also obtained. The differential diagnoses of tAMD versus PCV were made in accordance with previous reports [15–17]. Briefly, the tAMD group included only exudative AMD with clear images of the vascular CNV networks on ICGA. In the present study, tAMD included both of classic CNV (15 eyes) and occult CNV (9 eyes), but not RAP lesion in accordance with the previous report . The PCV cases in the present study showed subretinal reddish-orange protrusions corresponding to the choroidal origin of the polypoidal lesions, typically with the vascular networks in the posterior poles on ICGA [18, 19]. Patients with past histories of retinal vessel occlusion, uveitis, rhegmatogenous retinal detachment or glaucoma were excluded. Patients who received previous photodynamic therapy (PDT) more than 3 months before IVR were included in the primary analysis to evaluate the effect of history of PDT.
In the present study, an intravitreal injection of 0.5 mg of ranibizumab in 0.05 ml was performed per treatment. All patients received 3 consecutive monthly IVRs, and were followed-up monthly for 12 months from the initial IVR in accordance with the PrONTO study criteria . Additional IVRs were performed as needed, namely when sustained or recurrent serous retinal detachment, macular edema or hemorrhage was recognized by funduscopy or OCT. The FA and ICGA were repeated to evaluate the activities of the AMD lesions according to clinical recommendations if the funduscopic examinations could not explain the recent or progressive VA deterioration .
For statistical analysis, we first compared the gender, age, BCVA, greatest linear dimension (GLD), central retinal thickness (CRT), history of smoking and previous PDT therapy, presence of subretinal hemorrhage, serous retinal detachment, macular edema, retinal pigment epithelial detachment, subretinal fibrosis, hypertension and diabetes mellitus, and body mass index (BMI) at baseline between the tAMD and PCV groups. Changes in the BCVA and CRT were then compared within and between the tAMD and PCV groups until 12 months after the initial IVR. The visual acuities were determined using a Landolt C chart, and were converted to a logarithm of the minimum angle of resolution (logMAR) values for calculation. The CRT was obtained by OCT using the central 1 mm of the retinal thickness map with the Macular cube 200 × 200 scanning protocol (Cirrus HD OCT, Carl Zeiss Meditec, Dublin, CA). To evaluate the factors useful for predicting those patients whose BCVA at 12 months after the initial IVR were improved over the baseline BCVA, multivariate logistic regression analyses were performed using explanatory variables including gender, age, baseline BCVA, baseline GLD, baseline CRT, the number of previous PDT, history of smoking, presence of hypertension and diabetes mellitus, BMI and lesion phenotype (tAMD or PCV). Each variable was first calculated by a univariate logistic model, then the variables that showed some trend toward significant association (P value < 0.2) were further analyzed by a multivariate logistic model with stepwise method.
All statistical analyses were performed by MedCalc v.11.3 software (MedCalc Software, Mariakerke, Belgium). The chi-square test, paired t-test, unpaired t-test, Wilcoxon signed rank test or Mann-Whitney U test, whichever was the most appropriate, was performed to compare any two groups. A repeated measures analysis of variance (ANOVA) was used to make comparisons of changes in the BCVA between the tAMD and PCV groups over 12 months. P values of 0.05 or less were considered to be statistically significant.
Summary of the participants stratified by AMD phenotype
tAMD (n = 24)
PCV (n = 30)
Total (n = 54)
Eye (right eye%)
Age, Mean (±SD) (years)
Baseline Vision LogMAR (±SD)
Baseline macular thickness (±SD) (μm)
Baseline GLD (±SD) (μm)
Present or ever-smoking
Previous PDT therapy
Subretinal hemorrhage (>1DA)
Serous retinal detachment
Retinal pigmented epithelium detachment
Changes in the BCVA and CRT from baseline after IVR treatment in all AMD, tAMD and PCV patients
Change in BCVA
0.00 (-0.12 - 0.00)
−0.12 ( -0.24 - 0.00)
−0.12 ( -0.24 - 0.00)
−0.12 (-0.30 - 0.00)
0.00 (-0.17 - 0.00)
−0.20 (-0.30 - -0.05)
−0.18 (-0.30 - -0.05)
−0.18 (-0.30 - -0.05)
0.00 (-0.10 - 0.00)
−0.07(-0.22 - 0.00)
−0.04 (-0.18 - 0.00)
−0.05 (-0.24 - 0.10)
Change in CRT
−74 (-142 - -25)
−119 (-170 - -47)
−53 (-126 - -28)
−80 (-140 - -40)
−72 (-147 - -29)
−93 (-191 - -72)
−52 (-154 - -32)
−97 (-197 - -52)
−107 (-142 - -25)
−128 (-170 - -45)
−55 (-119 - -28)
−71 (-133 - -33)
Results of stepwise logistic regression analyses of preoperative variables associated with an vision gainer (improvement in the BCVA >0 LogMAR units from the baseline) at 12 months after the initial IVR
1.0 - 1.6
Phenotype (PCV = 0, tAMD =1)
1.2 - 15.9
No ocular or systemic complications were detected during the follow-up in the present study.
We investigated the 12 month outcomes of IVR in Japanese AMD patients, and investigated whether the different phenotypes of exudative AMD influenced the visual outcomes of IVR. Our results demonstrated that IVR improved the mean BCVA of exudative AMD in the Japanese population, and the visual improvement was significantly greater in the tAMD subjects than in the PCV subjects. The phenotype of exudative AMD was a possible significant prognostic factor for the visual acuity after IVR.
Currently, IVR is the leading therapy for exudative AMD since the ANCHOR study demonstrated significantly better visual outcomes with monthly IVR than PDT in exudative AMD patients (most of them were likely tAMD patients) in Western countries [20, 21]. However, in Japanese exudative AMD, which likely includes a number of PCV patients, IVR may not show as good an outcome as in Caucasian subjects [8, 9, 22]. In the present study, the mean and median LogMAR visual acuity of all AMD were significantly improved by -0.09 and -0.12 logMAR units at 12 months post-initial IVR, respectively. This result was compatible to the SUSTAIN study  and a previous report , but lower than the PrONTO and CATT study. In addition, our results showed a significant increase in the mean BCVA in patients with tAMD, and a modest improvement in those with PCV. On the other hand, Song et al.  reported that IVR without PDT for PCV in Korean patients resulted in visual and anatomical significant improvements over a 1-year follow-up period.
PCV is known to have different characteristics as compared with tAMD, such as orange-red protrusions at the posterior pole of the retina and distinct forms of choroidal vascular abnormalities, including vascular networks of choroidal origin with polypoidal lesions at their border visualized by ICG [16, 18]. In addition, Nakashizuka et al.  suggested that the histopathologic characteristic of PCV was hyalinization of the choroidal vessels like arteriosclerosis, which is different from the CNV associated with tAMD. Since PCV accounts for 54.7% of patients with neovascular AMD in the Japanese population  and 22.3% in the Chinese population , it is important to determine if there are some differences in the efficacy of anti-VEGF therapy against PCV and tAMD to choose the correct intervention for neovascular AMD in Asian populations.
It was interesting that the PCV patients showed poorer improvements in their BCVA than tAMD patients, although both phenotypes showed similar and significant improvements in their CRT during the 12 months after the initial IVR. A previous report showed a decrease in macular edema after three monthly bevacizumab injections in PCV cases . Similarly, the macular edema evaluated by the CRT measurements was improved in four out of five eyes with PCV (80%) in the PEARL study. However, the improvement in the BCVA was less than that in the ANCHOR or MARINA trials, although the reasons are unknown . We hypothesized that there might be factors other than macular edema which influence the visual acuity in tAMD and PCV cases differently. Although the mean baseline GLD was significantly greater in the PCV group than in the tAMD group in the present study, the results of the multivariate logistic regression analysis revealed that the lesion phenotype (tAMD or PCV) was the independent prognostic factor for the 12 month visual outcome after IVR. Moreover, the ANOVA indicated a significantly better visual prognosis in tAMD than PCV treated by IVR over a 12 month follow-up period. The logistic regression analysis also determined higher BMI as an independent beneficial factor for visual improvement after IVR, although the reason was unknown. A recent study demonstrated that circulating VEGF-A levels were strongly correlated with BMI  and the patients with higher baseline VEGF-A levels might be more susceptible to ranibizumab treatment. In the present study, the mean number of IVR injections was 4.1 (3.9 in tAMD group, 4.2 in PCV group), which was compatible with previous reports [24, 31]. However, these reports and our results did not achieve an equivalent improvement in BCVA when compared to the ANCHOR or MARINA study. This suggests that some patients in our study might have been under-treated by the PRN protocol, as discussed in the SUSTAIN study . In addition, there might be an extended interval between a decision of retreatment and a performance of retreatment in our study. Delay of treatment might have a potential risk of irreversible VA deterioration , and may be associated with a lower number of retreatments with IVR.
The effects of IVR against PCV are currently contentious, and no consensus has been made to date. Some studies reported that the polypoidal lesions of PCV were barely resolved by anti-VEGF monotherapy, which might explain the limited efficacy of IVR against PCV [9, 10]. However, other reports suggested that the disappearance of the polypoidal lesions occurred at a high rate in PCV cases with anti-VEGF monotherapy [26, 33, 34]. Although the PCV cases showed a modest improvement in their mean BCVA over 12 months in the present study, our results demonstrated that IVR rescued the vision of PCV patients, since we previously reported that the mean BCVA of PCV cases had deteriorated significantly by 12 months following their natural course . In addition, some recent studies reported a significant improvement of the visual acuity of PCV patients using IVR [26, 33, 34]. A recent report demonstrated that several pretreatment factors of PCV influenced the outcome of IVR , which might cause the inconsistent results of those studies regarding the effect of IVR on PCV. The worse baseline BCVA in the tAMD group than the PCV group (though not significant) might be associated with the Ceiling effects on the BCVA change after the treatment in the present study . Further studies with prospective nature using larger and better matched populations will be required to make a robust conclusion. The lack of data about the duration of symptoms that may influence the outcome of the treatment is another limitation of the present study.
It is interesting that several reports have shown different outcomes for PDT between tAMD and PCV patients [38, 39]. In those reports, significantly better visual outcomes were demonstrated for PCV than tAMD. Recently, a multi-center study was conducted to compare the effects of PDT and IVR in patients with PCV, and reported that both therapies as well as their combination (PDT + IVR) resulted in improvements of the patients’ visual acuity at 6 months post-treatment . In addition, PDT monotherapy and combination therapy achieved a significantly higher proportion of patients with complete polyp regression at 6 months than IVR monotherapy. Hence, it is important to evaluate the long-term results of IVR with a large number of subjects to determine the efficacy and durability of this therapy, particularly in PCV patients. Taken together, further investigation will be needed to determine the correct indications for IVR for exudative AMD.
In conclusion, IVR is an effective therapy to improve the vision of Japanese AMD patients, although this effect might be greater in tAMD patients than in PCV patients.
This study was supported by a Grant-in Aid (C) 23592567 from the Ministry of Education, Science and Culture, Tokyo, Japan (S.H.), and by a grant from the Takeda Science Foundation, Osaka, Japan (S.H.). The funding organization had no role in the design or conduct of this research.
- Morris B, Imrie F, Armbrecht AM, Dhillon B: Age-related macular degeneration and recent developments: new hope for old eyes?. Postgrad Med J. 2007, 83: 301-307. 10.1136/pgmj.2006.052944.View ArticlePubMedPubMed CentralGoogle Scholar
- Hernandez-Pastor LJ, Ortega A, Garcia-Layana A, Giraldez J: Ranibizumab for neovascular age-related macular degeneration. Am J Health Syst Pharm. 2008, 65: 1805-1814. 10.2146/ajhp070342.View ArticlePubMedGoogle Scholar
- Brown DM, Kaiser PK, Michels M, Soubrane G, Heier JS, Kim RY, Sy JP, Schneider S, ANCHOR Study Group: Ranibizumab versus verteporfin for neovascular age-related macular degeneration. N Engl J Med. 2006, 355: 1432-1444. 10.1056/NEJMoa062655.View ArticlePubMedGoogle Scholar
- Rosenfeld PJ, Brown DM, Heier JS, Boyer DS, Kaiser PK, Chung CY, Kim RY, MARINA Study Group: Ranibizumab for neovascular age-related macular degeneration. N Engl J Med. 2006, 355: 1419-1431. 10.1056/NEJMoa054481.View ArticlePubMedGoogle Scholar
- Tano Y, Ohji M, EXTEND-I Study Group: EXTEND-I: safety and efficacy of ranibizumab in Japanese patients with subfoveal choroidal neovascularization secondary to age-related macular degeneration. Acta Ophthalmol. 2010, 88: 309-316. 10.1111/j.1755-3768.2009.01843.x.View ArticlePubMedGoogle Scholar
- Fung AE, Lalwani GA, Rosenfeld PJ, Dubovy SR, Michels S, Feuer WJ, Puliafito CA, Davis JL, Flynn HW, Esquiabro M: An optical coherence tomography-guided, variable dosing regimen with intravitreal ranibizumab (lucentis) for neovascular Age-related macular degeneration. Am J Ophthalmol. 2007, 143: 566-583. 10.1016/j.ajo.2007.01.028.View ArticlePubMedGoogle Scholar
- Mitchell P, Korobelnik JF, Lanzetta P, Holz FG, Prünte C, Schmidt-Erfurth U, Tano Y, Wolf S: Ranibizumab (Lucentis) in neovascular age-related macular degeneration: evidence from clinical trials. Br J Ophthalmol. 2010, 94: 2-13. 10.1136/bjo.2009.159160.View ArticlePubMedGoogle Scholar
- Suzuki M, Gomi F, Sawa M, Tsujikawa M, Sakaguchi H: Bevacizumab treatment for choroidal neovascularization due to age-related macular degeneration in Japanese patients. Jpn J Ophthalmol. 2010, 54: 124-128. 10.1007/s10384-009-0775-3.View ArticlePubMedGoogle Scholar
- Maruko I, Iida T, Saito M, Nagayama D, Saito K: Clinical characteristics of exudative age-related macular degeneration in Japanese patients. Am J Ophthalmol. 2007, 144: 15-22. 10.1016/j.ajo.2007.03.047.View ArticlePubMedGoogle Scholar
- Gomi F, Sawa M, Sakaguchi H, Tsujikawa M, Oshima Y, Kamei M, Tano Y: Efficacy of intravitreal bevacizumab for polypoidal choroidal vasculopathy. Br J Ophthalmol. 2008, 92: 70-73. 10.1136/bjo.2007.122283.View ArticlePubMedGoogle Scholar
- Stangos AN, Gandhi JS, Nair-Sahni J, Heimann H, Pournaras CJ, Harding SP: Polypoidal choroidal vasculopathy masquerading as neovascular age-related macular degeneration refractory to ranibizumab. Am J Ophthalmol. 2010, 150: 666-673. 10.1016/j.ajo.2010.05.035.View ArticlePubMedGoogle Scholar
- Yamashiro K, Tomita K, Tsujikawa A, Nakata I, Akagi-Kurashige Y, Miyake M, Ooto S, Tamura H, Yoshimura N: Factors associated with the response of age-related macular degeneration to intravitreal ranibizumab treatment. Am J Ophthalmol. 2012, 154: 125-136. 10.1016/j.ajo.2012.01.010.View ArticlePubMedGoogle Scholar
- Matsumiya W, Honda S, Bessho H, Kusuhara S, Tsukahara Y, Negi A: Early responses to intravitreal ranibizumab in typical neovascular age-related macular degeneration and polypoidal choroidal vasculopathy. J Ophthalmol. 2011, 2011: 742020-PubMedPubMed CentralGoogle Scholar
- Martin DF, Maguire MG, Ying GS, Grunwald JE, Fine SL, Jaffe GJ, CATT Research Group: Ranibizumab and bevacizumab for neovascular age-related macular degeneration. N Engl J Med. 2011, 364: 1897-1908.View ArticlePubMedGoogle Scholar
- Yannuzzi LA, Sorenson J, Spaide RF, Lipson B: Idiopathic polypoidal choroidal vasculopathy (IPCV). Retina. 1990, 10: 1-8.View ArticlePubMedGoogle Scholar
- Yannuzzi LA, Ciardella A, Spaide RF, Rabb M, Freund KB, Orlock DA: The expanding clinical spectrum of idiopathic polypoidal choroidal vasculopathy. Arch Ophthalmol. 1997, 115: 478-485. 10.1001/archopht.1997.01100150480005.View ArticlePubMedGoogle Scholar
- Uyama M, Matsubara T, Fukushima I, Matsunaga H, Iwashita K, Nagai Y, Takahashi K: Idiopathic polypoidal choroidal vasculopathy in Japanese patients. Arch Ophthalmol. 1999, 117: 1035-1042. 10.1001/archopht.117.8.1035.View ArticlePubMedGoogle Scholar
- Spaide RF, Yannuzzi LA, Slakter JS, Sorenson J, Orlach DA: Indocyanine green videoangiography of idiopathic polypoidal horoidal vasculopathy. Retina. 1995, 15: 100-110. 10.1097/00006982-199515020-00003.View ArticlePubMedGoogle Scholar
- Ciardella AP, Donsoff IM, Huang SJ, Costa DL, Yannuzzi LA: Polypoidal choroidal vasculopathy. Surv Ophthalmol. 2004, 49: 25-37. 10.1016/j.survophthal.2003.10.007.View ArticlePubMedGoogle Scholar
- Schmidt-Erfurth UM, Richard G, Augustin A, Aylward WG, Bandello F, Corcòstegui B, Cunha-Vaz J, Gaudric A, Leys A, Schlingemann RO, European Society for Retina Specialists’ Guidelines Committee (EURETINA): Guidance for the treatment of neovascular age-related macular degeneration. Acta Ophthalmol Scand. 2007, 85: 486-494. 10.1111/j.1755-3768.2007.00979.x.View ArticlePubMedGoogle Scholar
- Ip MS, Scott IU, Brown GC, Brown MM, Ho AC, Huang SS, Recchia FM, American Academy of Ophthalmology: Anti-vascular endothelial growth factor pharmacotherapy for age-related macular degeneration: a report by the American academy of ophthalmology. Ophthalmology. 2008, 115: 1837-1846. 10.1016/j.ophtha.2008.08.012.View ArticlePubMedGoogle Scholar
- Mekjavic PJ, Kraut A, Urbancic M, Lenassi E, Hawlina M: Efficacy of 12-month treatment of neovascular age-related macular degeneration with intravitreal bevacizumab based on individually determined injection strategies after three consecutive monthly injections. Acta Ophthalmol. 2011, 89: 647-653. 10.1111/j.1755-3768.2009.01740.x. vView ArticlePubMedGoogle Scholar
- Holz FG, Amoaku W, Donate J, Guymer RH, Kellner U, Schlingemann RO, Weichselberger A, Staurenghi G, SUSTAIN Study Group: Safety and efficacy of a flexible dosing regimen of ranibizumab in neovascular age-related macular degeneration: the SUSTAIN study. Ophthalmology. 2011, 118: 663-671. 10.1016/j.ophtha.2010.12.019.View ArticlePubMedGoogle Scholar
- Kang S, Roh YJ: One-year results of intravitreal ranibizumab for neovascular age-related macular degeneration and clinical responses of various subgroups. Jpn J Ophthalmol. 2009, 53: 389-395. 10.1007/s10384-009-0670-y.View ArticlePubMedGoogle Scholar
- Song MH, Ryu HW, Roh YJ: One-year results of intravitreal ranibizumab with or without photodynamic therapy for polypoidal choroidal vasculopathy. Ophthalmologica. 2011, 226: 119-126. 10.1159/000329466.View ArticlePubMedGoogle Scholar
- Nakashizuka H, Mitsumata M, Okisaka S, Shimada H, Kawamura A, Mori R, Yuzawa M: Clinicopathologic findings in polypoidal choroidal vasculopathy. Invest Ophthalmol Vis Sci. 2008, 49: 4729-4737. 10.1167/iovs.08-2134.View ArticlePubMedGoogle Scholar
- Wen F, Chen C, Wu D, Li H: Polypoidal choroidal vasculopathy in elderly Chinese patients. Graefes Arch Clin Exp Ophthalmol. 2004, 242: 625-629. 10.1007/s00417-003-0667-z.View ArticlePubMedGoogle Scholar
- Lai TY, Chan WM, Liu DT, Luk FO, Lam DS: Intravitreal bevacizumab (Avastin) with or without photodynamic therapy for the treatment of polypoidal choroidal vasculopathy. Br J Ophthalmol. 2008, 92: 661-666. 10.1136/bjo.2007.135103.View ArticlePubMedGoogle Scholar
- Kokame GT, Yeung L, Lai JC: Continuous anti-VEGF treatment with ranibizumab for polypoidal choroidal vasculopathy: 6-month results. Br J Ophthalmol. 2010, 94: 297-301. 10.1136/bjo.2008.150029.View ArticlePubMedGoogle Scholar
- Wada H, Ura S, Kitaoka S, Satoh-Asahara N, Horie T, Ono K, Takaya T, Takanabe-Mori R, Akao M, Abe M, Morimoto T, Murayama T, Yokode M, Fujita M, Shimatsu A, Hasegawa K: Distinct characteristics of circulating vascular endothelial growth factor-a and C levels in human subjects. PLoS One. 2011, 6: e29351-10.1371/journal.pone.0029351.View ArticlePubMedPubMed CentralGoogle Scholar
- Cohen SY, Dubois L, Tadayoni R, Fajnkuchen F, Nghiem-Buffet S, Delahaye-Mazza C, Guiberteau B, Quentel G: Results of one-year’s treatment with ranibizumab for exudative age-related macular degeneration in a clinical setting. Am J Ophthalmol. 2009, 148: 409-413. 10.1016/j.ajo.2009.04.001.View ArticlePubMedGoogle Scholar
- Muether PS, Hoerster R, Hermann MM, Kirchhof B, Fauser S: Long-term effects of ranibizumab treatment delay in neovascular age-related macular degeneration. Graefes Arch Clin Exp Ophthalmol. 2013, 251: 453-458. 10.1007/s00417-012-2038-0.View ArticlePubMedGoogle Scholar
- Reche-Frutos J, Calvo-Gonzalez C, Donate-Lopez J, Garcia-Feijoo J, Leila M, Garcia-Sanchez J: Short-term anatomic effect of ranibizumab for polypoidal choroidal vasculopathy. Eur J Ophthalmol. 2008, 18: 645-648.PubMedGoogle Scholar
- Hikichi T, Ohtsuka H, Higuchi M, Matsushita T, Ariga H, Kosaka S, Matsushita R, Takami K: Improvement of angiographic findings of polypoidal choroidal vasculopathy after intravitreal injection of ranibizumab monthly for 3 months. Am J Ophthalmol. 2010, 150: 674-682. 10.1016/j.ajo.2010.05.026.View ArticlePubMedGoogle Scholar
- Bessho H, Honda S, Imai H, Negi A: Natural course and funduscopic findings of polypoidal choroidal vasculopathy in a Japanese population over 1 year of follow-up. Retina. 2011, 31: 1598-1602. 10.1097/IAE.0b013e31820d3f28.View ArticlePubMedGoogle Scholar
- Koizumi H, Yamagishi T, Yamazaki T, Kinoshita S: Predictive factors of resolved retinal fluid after intravitreal ranibizumab for polypoidal choroidal vasculopathy. Br J Ophthalmol. 2011, 95: 1555-1559. 10.1136/bjophthalmol-2011-300285.View ArticlePubMedGoogle Scholar
- Boyer DS, Antoszyk AN, Awh CC, Bhisitkul RB, Shapiro H, Acharya NR, MARINA Study Group: Subgroup analysis of the MARINA study of ranibizumab in neovascular age-related macular degeneration. Ophthalmology. 2007, 114: 246-252. 10.1016/j.ophtha.2006.10.045.View ArticlePubMedGoogle Scholar
- Gomi F, Ohji M, Sayanagi K, Sawa M, Sakaguchi H, Oshima Y, Ikuno Y, Tano Y: One-year outcomes of photodynamic therapy in age-related macular degeneration and polypoidal choroidal vasculopathy in Japanese patients. Ophthalmology. 2008, 115: 141-146. 10.1016/j.ophtha.2007.02.031.View ArticlePubMedGoogle Scholar
- Honda S, Kurimoto Y, Kagotani Y, Yamamoto H, Takagi H, Uenishi M: Photodynamic therapy for typical age-related macular degeneration and polypoidal choroidal vasculopathy: a 30-month multicenter study in Hyogo, Japan. Jpn J Ophthalmol. 2009, 53: 593-597. 10.1007/s10384-009-0741-0.View ArticlePubMedGoogle Scholar
- Koh A, Lee WK, Chen LJ, Chen SJ, Hashad Y, Kim H, Lai TY, Pilz S, Ruamviboonsuk P, Tokaji E, Weisberger A, Lim TH: EVEREST STUDY: efficacy and safety of verteporfin photodynamic therapy in combination with ranibizumab or alone versus ranibizumab monotherapy in patients with symptomatic macular polypoidal choroidal vasculopathy. Retina. 2012, 32: 1453-1464. 10.1097/IAE.0b013e31824f91e8.View ArticlePubMedGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2415/13/10/prepub
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