title: Incidence of choroidal neovascularization in the fellow eye in the comparison of age-related macular degeneration treatments trials.
abstract: OBJECTIVE
  To assess the influence of drug; dosing regimen; and traditional, nontraditional, and genetic risk factors on the incidence of choroidal neovascularization (CNV) in the fellow eye of patients treated for CNV with ranibizumab or bevacizumab.
  
  
  METHODS
  Cohort study of patients enrolled in a multicenter, randomized clinical trial.
  
  
  METHODS
  Patients with no CNV in the fellow eye at the time of enrollment in the Comparison of Age-Related Macular Degeneration Treatments Trials (CATT).
  
  
  METHODS
  Eligibility criteria for the clinical trial required that study eyes have evidence on fluorescein angiography and optical coherence tomography of CNV secondary to age-related macular degeneration (AMD) and visual acuity between 20/25 and 20/320. Treatment for the study eye was assigned randomly to either ranibizumab or bevacizumab and to 3 different regimens for dosing over a 2-year period. The genotypes for 4 single nucleotide polymorphisms (SNPs) associated with risk of AMD were determined. Only patients without CNV in the fellow eye at baseline were considered at risk. The CATT ophthalmologists examined patients every 4 weeks through 2 years and recorded treatment for CNV in the fellow eye.
  
  
  METHODS
  Development of CNV in the fellow eye.
  
  
  RESULTS
  Among 1185 CATT participants, 727 (61%) had no CNV in the fellow eye at enrollment. At 2 years, CNV had developed in 75 (20.6%) of 365 patients treated with ranibizumab and in 60 (16.6%) of 362 patients treated with bevacizumab (absolute difference, 4.0%; 95% confidence interval [CI], -1.7% to 9.6%; P = 0.17). The risk ratio for pro re nata dosing relative to monthly dosing was 1.1 (95% CI, 0.8-1.6). Greater elevation of the retinal pigment epithelium and fluid in the foveal center of the study eye were associated with increased incidence of CNV in the fellow eye. Incidence was not associated with genotype on rs1061170 (CFH), rs10490924 (ARMS2), rs11200638 (HTRA1), and rs2230199 (C3; P>0.35).
  
  
  CONCLUSIONS
  Through 2 years, there was no statistically significant difference between ranibizumab and bevacizumab in incidence of CNV in the fellow eye. Genotype on 4 SNPs previously found to be associated with AMD did not affect the risk of CNV in the fellow eye among CATT patients.
  
  
  BACKGROUND
  Proprietary or commercial disclosure may be found after the references.
authors.affiliation: Department of Ophthalmology, University of Pennsylvania, Philadelphia, Pennsylvania.
authors.forename: Maureen G
authors.initials: MG
authors.lastname: Maguire
authors.forename: Ebenezer
authors.initials: E
authors.lastname: Daniel
authors.forename: Ankoor R
authors.initials: AR
authors.lastname: Shah
authors.forename: Juan E
authors.initials: JE
authors.lastname: Grunwald
authors.forename: Stephanie A
authors.initials: SA
authors.lastname: Hagstrom
authors.forename: Robert L
authors.initials: RL
authors.lastname: Avery
authors.forename: Jiayan
authors.initials: J
authors.lastname: Huang
authors.forename: Revell W
authors.initials: RW
authors.lastname: Martin
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Roth
authors.forename: Alessandro A
authors.initials: AA
authors.lastname: Castellarin
authors.forename: Sophie J
authors.initials: SJ
authors.lastname: Bakri
authors.forename: Stuart L
authors.initials: SL
authors.lastname: Fine
authors.forename: Daniel F
authors.initials: DF
authors.lastname: Martin
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D020533:Angiogenesis Inhibitors / Q000627:therapeutic use*; D061067:Antibodies, Monoclonal, Humanized / Q000627:therapeutic use*; D000068258:Bevacizumab; D020256:Choroidal Neovascularization / Q000188:drug therapy / Q000453:epidemiology* / Q000235:genetics / Q000473:pathology; D015331:Cohort Studies; D003176:Complement C3 / Q000235:genetics; D017242:Complement Factor H / Q000235:genetics; D004305:Dose-Response Relationship, Drug; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D000074289:High-Temperature Requirement A Serine Peptidase 1; D006801:Humans; D015994:Incidence; D058449:Intravitreal Injections; D008268:Macular Degeneration / Q000150:complications / Q000188:drug therapy* / Q000235:genetics; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D011506:Proteins / Q000235:genetics; D000069579:Ranibizumab; D012697:Serine Endopeptidases / Q000235:genetics
chemical_list: C514392:ARMS2 protein, human; D020533:Angiogenesis Inhibitors; D061067:Antibodies, Monoclonal, Humanized; D003176:Complement C3; D011506:Proteins; D000068258:Bevacizumab; D017242:Complement Factor H; D000074289:High-Temperature Requirement A Serine Peptidase 1; C474012:HTRA1 protein, human; D012697:Serine Endopeptidases; D000069579:Ranibizumab