The burdens that monthly or every-other-month injections in the eye impose on patients with retinal diseases are well-known to be barriers to care for many people with these conditions. Making treatment less onerous has driven research into new treatments since the US Food and Drug Administration (FDA) approved ranibizumab (Lucentis) in 2006 as the first anti–vascular endothelial growth factor (VEGF) for the treatment of age-related macular degeneration (AMD) and other retinal diseases.
Those Several of those investigational therapies are poised to hit meaningful milestones in 2024.
Regular Eye Injections: How We Got Here
Ranibizumab originally received approval as a monthly injection. Since then, protocols have evolved to space those injections out to every other month in some, but not all, patients.
New drugs have emerged that require less frequent injections. In 2022, the anti-VEGF and angiopoietin-2 inhibitor faricimab (Vabysmo) was approved for dosing up to every 4 months. Last year, the FDA approved a high-dose formulation of the anti-VEGF treatment aflibercept 8 mg (Eylea HD) to be given every 2-4 months, as well.
But even these treatments require patients going to the office at least three or four times a year for injections, Reginald Sanders, MD, president of the American Society of Retina Specialist, Chicago, and a retina specialist in Washington, DC, told this news organization. “Now with injections, you have the anxiety of getting the injections, you have the inconvenience of coming in on a regular basis to get the injections, and you have mild discomfort — but you don’t go blind,” Dr. Sanders said.
Studies have shown patients with AMD or diabetic macular edema are better off getting more frequent injections, but still drug developers are seeking the holy grail of fewer injections. “How do we make these treatments last longer?” Dr. Sanders said. “Durability has become the catchword in our field. Instead of lasting a month or 2, can it last 3 months? Can it last 6 months? Or even a year? Can you get one injection and be done with it?”
Or, no injection at all?
“We’re looking for incremental improvements and longer-acting drugs, trying to lengthen the time between injections for wet AMD patients,” said David Boyer, MD, a retina specialist in Los Angeles.
Two Drugs May Be Better Than One
One combination treatment, sozinibercept, targets VEGF-C and D. The therapy is in two phase 3 trials: One in combination with aflibercept 2 mg (Eylea), which targets VEGF-A and B along with placental growth factor, and the other in combination with ranibizumab, which targets VEGF-A only. Data from one of those trials are expected this year, Dr. Boyer said.
A phase 2 trial last year reported that patients on combination sozinibercept-ranibizumab had significantly better visual acuity improvement than patients on ranibizumab only. The phase 3 trials ShORe with ranibizumab and COAST with aflibercept are evaluating improvements in visual acuity and retinal anatomy.
Two other combination therapies are in phase 2 trials, both with aflibercept: UBX1325 or foselutoclax, a small-molecule inhibitor of B-cell lymphoma extra-large, and umedaptanib pegol, an anti-fibroblast growth factor-2 aptamer. In the foselutoclax-aflibercept trial, 40% of patients didn’t need a supplemental anti-VEGF injection through 48 weeks, and 64% went treatment-free for more than 24 weeks.
Phase 2 trials of intravitreal umedaptanib pegol-aflibercept combination therapy in nAMD last year showed no superiority in vision and anatomical improvements over aflibercept alone but did find the combination halted disease progression, with “striking improvement” in previously untreated patients.