Background/Objectives: The PHOTON trial established the efficacy of aflibercept 8 mg using fixed-interval dosing in treatment-naïve patients; however, real-world evidence regarding pro re nata (PRN) regimens in switch cases remains limited. This pilot study evaluated the short-term efficacy and safety of switching to aflibercept 8 mg with PRN dosing in eyes with DME. Methods: This retrospective study included 20 eyes from 12 patients with DME who switched to aflibercept 8 mg and were followed for 6 months. Patients received initial induction doses (1–3 injections based on predetermined anatomical and functional criteria) followed by PRN dosing based on clinical findings. Primary outcomes were changes in best-corrected visual acuity (BCVA) and central retinal thickness (CRT). Treatment intervals and injection frequency were also analyzed. Results: Mean logMAR BCVA was maintained from baseline (0.242 ± 0.252) throughout the follow-up period: 0.164 ± 0.218 at 1 month, 0.138 ± 0.241 at 2 months, 0.145 ± 0.204 at 3 months, 0.143 ± 0.181 at 4 months, 0.149 ± 0.166 at 5 months, and 0.180 ± 0.224 at 6 months. No statistically significant changes in BCVA from baseline were observed at any time point. Mean CRT decreased from baseline (369.6 ± 138.3 μm) at all follow-up time points: 251.5 ± 82.1 μm at 1 month, 269.1 ± 104.5 μm at 2 months, 255.8 ± 67.8 μm at 3 months, 275.2 ± 76.6 μm at 4 months, 301.4 ± 81.2 μm at 5 months, and 302.7 ± 86.8 μm at 6 months. Statistically significant reductions in CRT were observed at 1 through 4 months (1 month: p = 0.000010; 2 months: p = 0.000243; 3 months: p = 0.000035; 4 months: p = 0.000597), whereas the reductions at 5 months (p = 0.0317) and 6 months (p = 0.0424) were not statistically significant. The mean number of injections over 6 months was 1.45 ± 1.05 (median 1; range 1–4), with 70% of eyes achieving treatment intervals ≥ 4 months. Five eyes (25%) required only the switching dose with no additional treatment during follow-up. No intraocular inflammation or retinal vasculitis was observed. Conclusions: Switching to aflibercept 8 mg with PRN dosing provided sustained anatomical improvement and maintained visual acuity in DME, with one quarter of the cases maintaining these outcomes with only a single additional injection. These real-world findings from a pilot study suggest that the PRN approach appears feasible and effective in real-world practice, offering a practical treatment option that may help reduce treatment burden while maintaining disease control.
Funatsu et al. (2026) studied this question.