The comparative effectiveness and cost-effectiveness of ranibizumab for neovascular macular degeneration revisited
© The Author(s) 2017
Received: 26 September 2016
Accepted: 30 November 2016
Published: 13 February 2017
To compare a near decade of follow-up, newer control cohort data, use of both the societal and third party insurer cost perspectives, and integration of unilateral/bilateral therapy on the comparative effectiveness and cost-effectiveness of intravitreal ranibizumab therapy for neovascular, age-related macular degeneration (AMD).
Value-Based Medicine®, 12-year, combined-eye model, cost-utility analysis employing MARINA and HORIZON clinical trial data. Preference-based comparative effectiveness outcomes were quantified in (1) QALY (quality-adjusted life-year) gain, and (2) percent improvement in quality-of-life, while cost-effectiveness outcomes were quantified in (3) the cost-utility ratio (CUR) and financial return-on-investment (ROI) to society.
Using MARINA and HORIZON trial data and a meta-analysis control cohort after 24 months, ranibizumab therapy conferred a combined-eye patient value (quality-of-life) gain of 16.3%, versus 10.4% found in 2006. The two-year direct ophthalmic medical cost for ranibizumab therapy was $46,450, a 33.8% real dollar decrease from 2006. The societal cost perspective CUR was −$242,920/QALY, indicating a $282,517 financial return-on-investment (ROI), or 12.3%/year to society for direct ophthalmic medical costs expended. The 3rd party insurer CUR ranged from $21,199/QALY utilizing all direct, medical costs, to $69,591/QALY using direct ophthalmic medical costs.
Ranibizumab therapy for neovascular AMD in 2015, considering treatment of both eyes, conferred greater patient value gain (comparative effectiveness) and improved cost-effectiveness than in 2006, as well as a large monetary return-on-investment to the Gross Domestic Product and nation’s wealth. The model herein integrates important novel features for neovascular age-related macular degeneration, vitreoretinal cost effectiveness analyses, including: (1) treatment of both eyes, (2) a long-term, untreated control cohort, and (3) the use of societal costs.
KeywordsRanibizumab Cost-utility analysis Age-related macular degeneration Clinical cost-utility model
Intravitreal ranibizumab therapy has been shown to be an effective treatment for minimally classic/occult [1, 2] and classic  subfoveal choroidal neovascularization occurring with neovascular age-related macular degeneration (NVAMD) in well designed and executed Level 1  clinical trials. Ranibizumab (Lucentis®) is a recombinant humanized, IgG1 kappa isotype, monoclonal antibody fragment designed for intraocular use . It binds to and inhibits the biologic activity of human vascular endothelial growth factor A (VEGF-A), a molecule believed to be primarily responsible for the development of the choroidal neovascularization associated with NVAMD.
A number of healthcare economic studies, including cost-utility analyses, cost-effectiveness analyses and cost-benefit analyses, have addressed the use of ranibizumab for the treatment of NVAMD [6–12]. Unfortunately, even with sensitivity analyses , very few cost-utility analyses (also called cost-effectiveness analyses by some ) are comparable due to the use of different utilities, dissimilar utility respondents, differing cost perspectives, diverse costs bases, unlike discounting and so forth . The Center for Value-Based Medicine® has estimated that over 27,000,000 different, input variable combinations can be used in a single cost-utility analysis . Even one different input can make a major difference in the outcome [4, 14].
Value-Based Medicine® (VBM) [4, 14–17] is a methodology of cost-utility analysis employing standardized inputs to determine the patient value gain and financial value gain conferred by healthcare interventions. Patient value gain is quantified by improvement in length-of-life and/or quality-of-life; it is measured in QALY (quality-adjusted life-year) gain and percent patient value gain. The intervention which confers the greatest patient value has the greatest comparative effectiveness. VBM integrates financial value gain using the resources expended for the patient value gain in terms of the cost-utility ratio ($/QALY, or dollars expended per QALY gained), and the dollar return-on-investment (ROI) to society for the interventional, direct medical costs expended (cost-benefit ratio). VBM [4, 14–17] standardizes cost-utility analysis variables by typically utilizing: (1) time tradeoff utilities, (2) patient utility respondents, (3) the average national Medicare Fee Schedule, and (4) both societal and 3rd party insurer cost perspectives.
The Panel on Cost-Effectiveness in Health and Medicine [13, 18] has recommended that cost-utility analyses use the societal cost perspective. While the literature is replete with cost-utility analyses touting the cost-effectiveness of healthcare interventions, most do not address the entirety of societal costs affected by healthcare interventions .
Beauchamp and colleagues  have long advocated that medicine’s business is the production of patient value and economic return. We agree that healthcare economic analyses should ideally provide accurate assessments of, not only conferred patient value and the societal cost-utility, but also the financial ROI accrued to society and to the GDP (Gross Domestic Product) .
In 2008, we published a third party insurer, second-eye model, cost-utility analysis (using 2006 data and costs) on ranibizumab for the treatment of neovascular AMD utilizing MARINA (Minimally classic/occult trial of the Anti-VEGF antibody Ranibizumab In the treatment of Neovascular Age-Related Macular Degeneration) Study data . Longer treatment data, improved control cohort data  and societal cost data [21, 22], however, have since become available that dramatically alter the patient value gain. Financial ROI was not addressed in our 2008 report . Thus, we believe it important to present these data in a cost-utility analysis demonstrating recent patient value gain and financial value gain for ranibizumab therapy for AMD. These will be compared with 2006 data  that are available.
The MARINA and HORIZON trials
MARINA study clinical and cost-utility analysis parameters
Clinical features 
Each participant had minimally classic or occult, subfoveal choroidal neovascularization
Best corrected ETDRS entrance vision in the affected eye: 20/40–20/320
Choroidal neovascular lesions <12 disc areas at baseline
Baseline vision: mean 20/80 − 1 in both the ranibizumab treatment and sham treatment cohorts
Mean baseline age: 77 years
Treatment protocol: Participants were randomized equally to: (1) a 0.5 mg intravitreal ranibizumab dose cohort (n = 240), (2) a 0.3 mg intravitreal ranibizumab dose cohort (n = 238) or (3) a sham injection treatment cohort (n = 238)
Only data from the 0.5 mg ranibizumab cohort (0.5 mg was the dose eventually approved by the Food & Drug Administration ) and the sham treatment control cohort were utilized in the cost-utility analysis herein
The average participant received 22 × 0.05 cc intravitreal injections, given approximately monthly, over 2 years
Cost-utility analysis assumptions
Mean life expectancy: 12 years for the control and ranibizumab study cohorts 
12-year time span for model utilizing 2-year MARINA data from the sham treatment control group and the 0.05 mg ranibizumab treatment group
Societal and 3rd party insurer cost perspectives
Cost basis: average 2015, national, Medicare Fee Schedule
Sham treatment, control cohort data utilized: mean vision in MARINA Study for years 1 and 2; Lineweaver-Burke plot meta-analysis  control cohort for years 3–12
Treatment cohort (0.5 mg ranibizumab) mean vision: MARINA Study for years 1 and 2, HORIZON open-label extension trial for 25–49 months, LOCF (last observation carried forward) for months 49–144 
Adverse events as previously listed 
Patient utilities as previously listed 
Mean MARINA study vision levels (years 1–2), HORIZON extension trial (years 3–4), then last observation carried forward to year 12 in the 0.5 mg treatment cohort, with a meta-analysis control cohort from years 3–12
0.5 mg treatment cohort
20/80 − 1
20/80 − 1
20/100 − 2
20/63 + 1
20/160 + 2
20/63 + 1
20/160 − 1.5
20/63 + 1
20/63 + 1
20/80 + 2
20/80 + 1
20/500 + 2
20/80 + 1
20/80 + 1
20/640 + 2
20/80 + 1
20/80 + 1
Sham cohort, MARINA trial , control data were used for 24 months, after which MARINA control cohort eyes were eligible for treatment with ranibizumab. Thus, control data for years 3–12 were derived from the meta-analysis of Shah and Del Priore , who used a double reciprocal (Lineweaver-Burke plot) methodology to assess the natural course of untreated subfoveal choroidal neovascularization associated with AMD. Shah and Del Priore plotted the variables of 1/(letters lost) versus 1/(time in months) (r2 = .9521) for the control groups of six major subfoveal, neovascular, AMD clinical trials . The longest follow-up among these trials was 84 months. Shah and Del Priore  found the pattern of visual loss in eyes with subfoveal neovascular AMD to be uniform across the trials, with differences arising primarily from the time of entry into a trial.
The time tradeoff vision utilities utilized herein, as in our previous report  were obtained with the approval of the Wills Eye Hospital Institutional Review Board from a cohort of over 1100 interviews of patients with ocular diseases. The utilities are reproducible and validated across age, level of education, ocular diseases, ethnicity, gender, income level, and the presence of comorbidities [24–31]. The disutilities from adverse events and their associated costs are integrated and treated in the same fashion as in our previous report .
Healthcare economic costs can be subdivided into: (1) direct medical costs (physician, facility and drug costs), (2) direct non-medical costs (caregiver, residence, and activities of daily living costs), and (3) indirect costs (decreased wages) . In the previous ranibizumab cost-utility analysis  only 2006 U.S. nominal, direct ophthalmic medical costs were utilized. The current study uses 2015 U.S. societal costs in real dollars.
Direct non-ophthalmic medical costs
societal costs associated with ranibizumab therapy for neovascular age-related macular degeneration
Direct ophthalmic medical costs
Ranibizumab therapy (81.3% bilateral)
Direct non-ophthalmic medical costs
SNF cost decrease
Unexplained medical cost decrease
Total offsetting costs
Total direct medical costs
Direct non-medical costs
Paid caregiver salariesa
Salary gain for freed-up caregivers now able to take up gainful employment
Total direct non-medical costs
Indirect medical costs
Mean patient wage gain
Total societal costs
Direct non-ophthalmic medical costs, direct non-medical costs and indirect medical costs only accrue for the second-eye model, since the first-eye model, fellow eye still has good vision. With Markov modeling (Treeage Software Inc., Williamstown, MA) and the data of Barbazetto et al.  81.3% of the time during the 12-year model people have bilateral neovascular AMD (second-eye model). Thus the societal costs, excluding the direct ophthalmic medical costs, were all multiplied by 0.813. All direct ophthalmic costs are accrued, whether for the first eye or second eye treated.
Direct non-medical costs
Also absent in the previous report , but included herein, are the caregiver costs for AMD demonstrated by Schmier et al.  (Table 3). These were adjusted to 2015 U.S. dollars with the general CPI . Schmier and colleagues  noted 27.7% of caregivers were paid and 72.3% were unpaid.
Salaries of previously unpaid caregivers freed-up to undertake paid employment as a result of ranibizumab therapy were treated as direct non-medical costs contributing to a gain in the GDP. The 27.7% of already paid caregiver salaries  decrease the GDP since these jobs are made unnecessary by better vision obtained from ranibizumab therapy. While displaced paid caregivers can obtain other jobs, we prefer a conservative analysis.
Indirect medical costs
The major, AMD indirect medical cost is loss of patient salary. Data from the Americans with Disabilities Household Economic Studies  show, between the decreased employment rate and decreased salary, a person with mild difficulty reading (vision <20/40) has an annual salary of $22,551, versus $18,915 for a person with severe difficult reading and $47,230 for a non-disabled person . If a person with severe difficulty reading achieves >20/40 vision, the salary gain is ($47,230 − $18,913=) $28,317, while the gain from mild difficulty reading to >20/40 vision is ($47,230 − $22,551=) $24,679. Taking into account the proportions of people employed at different ages, the total salary gain from ranibizumab therapy was $9057.
Gross Domestic Product (GDP)
The GDP is a primarily a measure of the final goods and services produced within the country in a year . It has four components: (1) consumer spending, (2) industry investment in new productive capabilities, (3) the excess of exports minus imports, and (4) the goods and services bought by the government. While a simplistic view, increasing the GDP increases the country’s wealth .
Net present value analysis
Net present value analysis weighs the costs versus the QALY gain, each reduced to present value by discounting. The Panel for Cost-Effectiveness in Health and Medicine  has recommended the 3% annual discount rate used herein.
The concept of first-eye and second-eye models was developed at the Center for Value-Based Medicine® based upon data from patients with ocular diseases. The first-eye model assumes vision in the fellow eye is normal; interventional patient value, or benefit, is usually not conferred until fellow eye vision deteriorates. The second-eye model assumes vision in first eye has already deteriorated. Thus, patient value gain is conferred from the initiation of therapy. The combined-eye model used for our base case is a weighted average of first- and second-eye models. Most ocular cost-utility models have used the second-eye model [6–12, 15, 17], suggesting a bias toward overstatement of patient value gains and greater cost-effectiveness.
Treeage Pro Healthcare, Excel Module 2014 software (Treeage Software Inc., Williamstown, MA) was utilized to assess the value gain for ranibizumab therapy in the first-eye and combined-eye models in our Sensitivity Analysis.
Patient value gain
With the 12-year combined-eye model, the mean base case, patient value gain from intravitreal ranibizumab therapy utilizing the meta-analysis control cohort  from years 3 to 12 was 1.136 QALYs. This converted to a mean 16.3% quality-of-life improvement for the average patient, versus a 10.4% quality-of-life gain in 2006 . The second-eye model accrued 1.372 QALYs, a 22.8% improvement in quality-of-life, versus 15.8% in 2006 .
Financial value gain
Direct ophthalmic medical costs
2006 Versus 2015 direct ophthalmic medical costs and patient value gain versus ranibizumab therapy for first two years
Adjusted with medical CPI to 2015 US $
Decrease in real dollars from 2006 to 2015
Patient value (quality-of-life) gain
Direct non-ophthalmic medical costs (Table 3)
The 12-year direct medical cost saved from the reduction of the depression, injury reduction, nursing home, SNF and so forth (Table 3) was $54,974 . When this was subtracted from the direct ophthalmic medical cost of $79,056, the total direct medical cost was $24,082.
Direct non-medical costs. (Table 3)
The 12-year, direct non-medical cost saving for paid caregivers, who comprise 27.7% of caregivers, was $82,419 (Table 3). The $215,123 for unpaid caregivers corresponded to potential salary earned by freed-up, unpaid caregivers obtaining paid jobs . This accrues to society and the GDP (Table 3).
Indirect medical costs: increased patient salaries (Table 3)
The 12-year cost associated with higher employment rates and improved salaries for ranibizumab-treated neovascular AMD patients with improved vision was $9057.
Total societal costs
The sum of costs accruing against the direct ophthalmic medical costs was (−$361,573). When the total direct ophthalmic medical cost of $79,056 was subtracted, the resultant dollars returned to society (or negative costs), primarily patients, was (−$282,517) (Table 3).
Physician fees in 2006 comprised 11.7% of direct ophthalmic medical costs and in 2015 comprised 5.6%. Ranibizumab costs in 2006 comprised 85.2% of costs, versus 91.9% of total costs in 2015 (Table 4).
Gross Domestic Product
Societal and 3rd party insurer cost perspective cost-utility analyses (2015 U.S. real dollars discounted at 3% annually)
3rd party insurer
Ranibizumab therapy, direct ocular medical costsa
Subacute Nursing Facility (SNF)b
Unexplained direct medical Medicare costsb
Patient employment gaina
Paid caregivers released from jobsb
Increased paid employment by freed-up unpaid caregiversa
Total costs offsetting the direct ophthalmic medical costs
Direct medical costs + offsetting costs = financial return to society
Financial ROI for direct ophthalmic medical costs expended
QALY gain: combined-eye model
QALY gain: second-eye model
VRQOL gain, combined-eye model
VRQOL gain, second-eye model
$/QALY, combined-eye model
$/QALY, second-eye model
Addition to GDP
Financial ROI for GDP referent to direct ophthalmic medical costs expended
An average cost-utility analysis compares an intervention to no therapy, while an incremental cost-utility analysis compares an intervention to other interventions .
The average, combined-eye, CUR with the MARINA Study societal cost perspective was (−$282,517/1.163=) (−243,921/QALY) (Table 5). A negative CUR indicates a dominant therapy in that it is less expensive than the alternative (observation) and at the same time it generates greater patient value than the alternative (observation herein). The CUR associated with the 3rd party insurer cost perspective using all direct medical costs (ophthalmic + non-ophthalmic) was ($24,082/1.136=) $21,199/QALY. With direct ophthalmic medical costs alone, the CUR was ($79,056/1.136=) $69,591/QALY. While the latter costs for NVAMD therapy over 12 years were higher than in 2006 , the earlier model did not include HORIZON trial and fellow eye treatment costs.
Incremental cost-utility ratios of ranibizumab referent to laser photocoagulation, intravitreal pegaptanib, and PDT
Sensitivity analysis results for ranibizumab for the treatment of subfoveal neovascular AMD utilizing a societal cost perspective, average cost-utility analysis (bilateral treatment model unless otherwise specified)
2nd eye model, societal costs
2nd eye model, 3rd party insurer costs
1st eye model, societal costs
1st eye model, 3rd party insurer costs
Combined-eye model, societal costs—BASE CASE
Combined-eye model, all 3rd party insurer costs
Combined-eye model, direct ophthalmic medical costs only
Ranibizumab cost increased 100%
Four additional ranibizumab annually, years 3–13
Caregiver costs excluded
Cost of therapy decreased by 50%
Treat-and-extend regimen costs (assuming same value gain) a
Direct ophthalmic medical costs only, treat-and- extend, no fellow eye treatment costs
Current study, direct ophthalmic medical costs, no fellow eye treatment costs
Patient value gain (QALY gain) drops by 50% for years 5–12, societal costs
Patient value gain (QALY gain) drops by 50% years 5–12, 3rd party insurer costs
For cost-utility of $50,000/QALY
For cost-utility of $100,000/QALY
The societal cost perspective, first-eye model conferred 0.680 QALY, a 9.8% improvement in quality-of-life, while the second-eye model conferred 1.372 QALYs, a 22.8% improvement in quality-of-life. The first-eye model, societal, CUR was (−$415,367)/QALY, while the second-eye model, societal, CUR was (−$205,971)/QALY. Since the costs were the same with each of these three variants, a less negative CUR indicates greater cost-effectiveness. In general, however negative CURs are not comparable, but rather indicate dominance.
Changes in cost
Increasing ranibizumab costs by 100%, the combined-eye, adding four additional ranibizumab injections annually and excluding caregiver costs all yielded cost-effective results (Table 7). Using costs from a treat-and-extend model , the 3rd party insurer cost perspective had a CUR of $45,995, similar to that of $48,036 using comparable costs in our current analysis.
When the QALY gain decreased by 50% from years 5 to 12, the CUR was (−$462,960/QALY).
For a societal cost perspective CUR of $50,000/QALY, the direct ophthalmic medical costs had to be increased to $339,317, a 329% increase over the current $$79,056. For a CUR of $100,000/QALY, the direct ophthalmic medical costs had to be increased to $432,021, a 401% increase over $79,056.
# of drugs
Patient value gain (%)
Histamine H-1 receptor antagonists, oral
Histamine H-1 receptor antagonists, topical ocular
cGMP-specific phosphodi-esterase inhibitors
Proton pump inhibitors
Acute erosive esophagitis
Proton pump inhibitors
Proton pump inhibitors
Histamine H-2 receptor antagonists
Acute erosive esophagitis
Histamine H-2 receptor antagonists
Hypertension, systemic arterial
Hypertension, systemic arterial
Hypertension, systemic arterial
Ranibizumab, combined eye model
Neovascular age-related macular degeneration, current study
Our analysis demonstrates that ranibizumab therapy for NVAMD confers considerable patient value. This does not refer to cost, but rather the improvement in quality-of-life conferred by ranibizumab. Our previous analysis of patient value gain for the same intervention  demonstrated a 10.4% combined-eye model, value gain , versus 16.3% in the current analysis. With HORIZON trial data  and control cohort data from Shah and DelPriore , our 2015 analysis provides more reliable data than our 2006 data , which used a LOCF methodology from month 25 forward. It should be noted that ophthalmic patient utility gains tend to be similar in the United States, Canada and Europe [14, 24, 41, 42]. Utilities appear to be innate to human nature rather than one society . Thus, the patient value gain data in this analysis can be integrated with the associated costs for ranibizumab therapy for NVAMD in another country and likely provide a valid cost-utility analysis for that country.
As used in the MARINA Study , intravitreal ranibizumab therapy yields a considerable financial return-on-investment to society and the GDP. The GDP is often regarded as a determinant of a nation’s wealth . Ranibizumab therapy improves physical well-being, or human capital, which directly results in financial capital gain and also allows a dramatic decrease in caregiver costs.
The societal costs associated with many healthcare interventions are not well-defined, and only recently have those associated with vision loss and macular degeneration been identified [22, 23, 37, 39, 40, 43]. The majority of cost-utility analyses have not included caregiver costs, but they are especially relevant for untreated bilateral NVAMD .
Concerning employment and the decreased salary associated with disabilities, Americans with Disabilities Household Economic Studies data from the U.S. Census Bureau  are enlightening. Those with difficulty reading have lower mean earnings than those with hearing difficulty, a learning disability or in a wheelchair .
The societal cost perspective generally produces an improved CUR for an intervention compared to the direct ophthalmic medical cost perspective [9, 37, 40]. This concept is demonstrated herein for ranibizumab (Table 5). Caregiver costs saved, improved salary and employment and direct medical costs obviated (depression, injury, facility admissions etc.) herein all accrue against the direct ophthalmic medical costs expended.
Healthcare interventions costing <$100,000/QALY are generally accepted as cost-effective in the U.S.  The World Health Organization  suggests an upper cost-effectiveness limit of 3× GDP per capita, or ~$164,000/QALY for the United States . The use of ranibizumab in the societal cost perspective is very cost-effective by each of these criteria.
Potential study weaknesses
As with any analysis, there are potential inherent weaknesses in this study.
Neovascular AMD sub-types
The MARINA clinical trial assessed occult and minimally classic AMD variants, which together comprise 80% of neovascular AMD cases . Ranibizumab therapy for classic neovascular AMD (20% of cases), as studied in the ANCHOR clinical trial , results in slightly greater, patient value gain than in the MARINA trial , suggesting the data in our analysis are actually conservative.
Absence of long-term clinical trial data
The absence of randomized clinical trial data after two years is a drawback, through HORIZON data provide treatment efficacy thru 48 months and Shah and DelPriore provide an excellent long-term control cohort . The SEVEN-UP Study  followed ranibizumab-treated NVAMD patients for up to seven years, but the very small numbers of patients (~10% of those enrolled) likely introduce bias. Thus, we did not employ these data. The sensitivity analysis, however, demonstrates excellent cost-effectiveness even if ranibizumab loses 50% of its efficacy from months 49 to 144.
Unpaid caregiver costs
Unpaid caregivers may not obtain paid employment once freed-up to do so, but the sensitivity analysis addressed this as well. Even when all costs related to unpaid caregivers gaining paid employment are excluded, the CUR is still very cost-effective at $13,226/QALY.
Use of other drugs
Our intent herein was to compare the changes in preference-based comparative effectiveness and cost-utility for the same drug treating the same disease over a near decade. We thus did not perform cost-utility analyses on other VEGF inhibitors used for the treatment of NVAMD, such as aflibercept and bevacizumab.
Study strengths: differences from 2006 to 2015
Macroeconomic (ROI) for ranibizumab therapy for neovascular AMD using the societal cost perspective, combined-eye model
Direct ophthalmic medical cost per patient
Annual # of cases
Total direct ophthalmic medical costs
Net cost/case with direct ophthalmic costs
12-year financial gain
MARINA—costs off-setting the s direct ocular medical costs
MARINA GDP gain
In summary, the 2015 patient value gain conferred by, and costs associated with, ranibizumab therapy for NVAMD compare favorably with those from 2006. Longer-term treatment cohort follow-up, a more reliable control cohort, the inclusion of societal costs and a bilateral treatment model all result in a more robust 2015 analysis. The therapy provides great patient value than many common interventions across healthcare and also provides a considerable financial return-on-investment to society Changing patterns of therapy, such as increased use of a treat-and-extend model may result in more favorable cost-effectiveness yet for ranibizumab therapy.
age-related macular degeneration
neovascular age-related macular degeneration
Gross Domestic Product
last observation carried forward
return on investment
minimally classic/occult trial of the anti-VEGF antibody ranibizumab in the treatment of neovascular age-related macular degeneration
vascular endothelial growth factor
consumer price index
Acquisition, analysis and interpretation of data: GCB, MMB, HBL. Drafting of manuscript and revising intellectual content: GCB, MMB, HBL, AT, YR. Final approval of manuscript: GCB, MMB, HBL, AT, YR. Accountable for manuscript accuracy and integrity: GCB, MMB. All authors read and approved the final manuscript.
Drs. G. Brown and M. Brown are stockholders in the Center for Value-Based Medicine®. Drs. A. Turpcu and Y. Rajput are employees of Genentech, Inc.
Availability of data and materials
The datasets during and/or analysed during the current study are available from the corresponding author on reasonable request.
Ethics approval and consent to participate
The MARINA trial received approval from the institutional review board at each of 96 study sites before the enrollment of patients. Patients provided written informed consent before determination of their full eligibility. The HORIZON study protocol was approved by the respective institutional review boards before study initiation, and all participating patients provided informed consent. The time tradeoff vision utilities utilized were obtained with the approval of the Wills Eye Hospital Institutional Review Board.
This study was funded through a grant from Genentech, Inc. to the Center for Value-Based Medicine.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
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