Influence of the vitreomacular interface on outcomes of ranibizumab therapy in neovascular age-related macular degeneration

Abstract

Purpose: To investigate the influence of the vitreomacular interface (VMI) on the functional and anatomic efficacy of ranibizumab therapy in patients with neovascular age-related macular degeneration (AMD).

Design: Subanalysis of a prospective, 12-month, multicenter, phase IIIb trial.

Participants: A total of 353 treatment-naïve patients with subfoveal choroidal neovascularization (CNV) receiving quarterly or monthly ranibizumab therapy.

Methods: On monthly optical coherence tomography (OCT) scan sets, the VMI configuration was graded by a certified reading center into one of the following conditions: continuous posterior vitreoretinal attachment (PVA), vitreomacular adhesion (VMA), partial vitreous detachment without vitreomacular contact, or complete posterior vitreous detachment (PVD). Best-corrected visual acuity (BCVA) and central retinal thickness (CRT) measurements were performed at monthly intervals. Analysis included patients with a minimum of 10 OCT examinations, including baseline and month 12 (n = 251). After integration of the VMI configuration over 12 months, patients were divided into one of the following categories: PVD (n = 162), release of vitreomacular contact (RELEASE; n = 48), VMA (n = 37), or PVA (n = 4). General estimation equation analyses were applied to test for noninferiority of quarterly versus monthly treatment.

Main outcome measures: The BCVA and CRT changes at month 12.

Results: Mean BCVA changes in letters were +4.7 (PVD), +3.2 (RELEASE), and -0.2 (VMA) in the quarterly regimen and +4.9 (PVD), +12.7 (RELEASE), and +7.5 (VMA) in the monthly regimen. No difference in therapeutic efficiency between monthly and quarterly intervention was found in eyes with PVD, and quarterly treatment was noninferior to monthly treatment (P = 0.001). However, monthly treatment was superior to quarterly treatment in the RELEASE (P = 0.008) and VMA (P = 0.043) groups. Mean CRT changes were -98 and -96 μm (PVD), -117 and -136 μm (RELEASE), and -93 and -87 μm (VMA) in the monthly and quarterly regimens, respectively, without statistically significant differences.

Conclusions: The configuration of the VMI seems to have an important effect on visual outcomes and need for retreatment. In patients with PVD, a lower treatment frequency may be feasible, whereas patients with RELEASE or VMA may benefit from intensive retreatment. These findings may serve as a basis for individualized treatment decisions in anti-angiogenic therapy of neovascular AMD and perhaps other indications.