Impact of Baseline Characteristics on Treatment Response to Intravitreal Aflibercept Injection for Wet Age-Related Macular Degeneration

Abstract

To determine whether wet age-related macular degeneration (AMD) treatment outcomes within prespecified patient subgroups were consistent with overall study results. Additionally, this subanalysis investigated whether there were any relationships between baseline characteristics and evaluated treatment outcomes. Post hoc subanalysis of The VEGF Trap-Eye: Investigation of Efficacy and Safety in Wet AMD (VIEW) 1 and 2, 2 similarly designed prospective, multicenter, double-masked, active-controlled, parallel-group, randomized clinical trials. Two thousand four hundred twelve patients with an active subfoveal choroidal neovascularization (CNV) lesion of any subtype secondary to AMD. Primary and key secondary visual end points at week 52 were examined to explore the consistency of effect among prespecified subgroups of 5 baseline characteristics: age, best-corrected visual acuity (BCVA), lesion type, lesion size, and central retinal thickness (CRT). Additionally, within-group analyses were conducted to determine whether the mean changes in BCVA and CRT at 52 weeks were associated positively or negatively with the baseline characteristics of interest. Consistency of treatment outcomes among prespecified subgroups of baseline characteristics. For each baseline characteristic, tests for interaction within each prespecified subgroup and among the subgroups were not significant, suggesting that relative visual outcomes for each treatment arm were consistent with overall study outcomes. Within-group analysis revealed a significant association between baseline age, BCVA, and lesion size with BCVA outcomes at 52 weeks; namely, older age, greater BCVA, and larger lesion size were associated with lower mean BCVA gains at 52 weeks. Patients in all subgroups of baseline age, BCVA, lesion type, lesion size, and CRT experienced visual outcomes consistent with those of the overall study population. Additionally, baseline older age, better BCVA, and larger CNV lesion size were found to be associated independently with lower mean BCVA gains after 52 weeks of anti-vascular endothelial growth factor therapy. The influence of baseline age, BCVA, and CNV lesion size on treatment outcomes is consistent with other reports from large, prospective trials in wet AMD.