Researchers assessed the outcomes of Diabetic macular edema  persisting at least 24 weeks after randomization to treatment with 2.0-mg aflibercept, 1.25-mg bevacizumab, or 0.3-mg ranibizumab. The study findings were published in the  JAMA Ophthalmology

Prevalence of persistent central-involved diabetic macular edema ( DME ) through 24 weeks of anti-vascular endothelial growth factor therapy and its longer-term outcomes may be relevant to treatment.

Post hoc analyzes of a clinical trial, DRCR.net Protocol T among 546 of 660 participants (82.7%) meeting inclusion criteria for this investigation.

Six monthly intravitreous anti-vascular endothelial growth factor injections (unless after 3 to 5 injections); subsequent injections or focal / grid laser as needed per protocol to achieve stability.

Persistent DME through 24 weeks, probability of chronic persistent DME through 2 years, and at least 10-letter (≥ 2-line) gain or loss of visual acuity. The mean age of participants was 60 years, 363 (66.5%) were white, and 251 (46.0%) were women.

Persistent DME through 24 weeks was more frequent with bevacizumab (118 of 180 [65.6%]) than aflibercept (60 of 190 [31.6%]) or ranibizumab (73 of 176 [41.5%]) (aflibercept vs bevacizumab,  P  <.001 ; ranibizumab vs bevacizumab,  P  <.001; and aflibercept vs ranibizumab,  P  = .05).

Among eyes with persistent DME through 24 weeks (n = 251), rates of chronic persistent DME through 2 years were 44.2% with aflibercept, 68.2% with bevacizumab (aflibercept vs bevacizumab,  P  = .03), and 54.5% with ranibizumab (aflibercept vs ranibizumab,  P  = .41; bevacizumab vs ranibizumab,  P  = .16).

DME through 24 weeks, proportions with vs without chronic persistent DME through 2 years gaining at least 10 letters from baseline were 62% of 29 eyes vs 63% of 30 eyes ( P  = .88) with aflibercept, 51% of 70 vs 54% of 31 ( P  = .96) with bevacizumab, and 44% of 38 vs. 65% of 29 ( P  = .10) with ranibizumab . Only 3 eyes with chronic persistent DME lost at least 10 letters.

Persistent DME was more likely with bevacizumab than with aflibercept or ranibizumab. Among eyes with persistent DME, eyes assigned to bevacizumab were more likely to have chronic persistent DME than eyes assigned to aflibercept .

These results suggest meaningful gains in vision with little risk of vision loss , regardless of anti-vascular endothelial growth factor agent given or persistence of DME through 2 years.

Caution is warranted when considering switching therapies for persistent DME following 3 or more injections; improvements could be owing to continued treatment rather than switching therapies.