Ocuphire Pharma announced that it has screened the first patient in ZETA-1, a phase 2 trial to evaluate APX3330 in non-proliferative diabetic retinopathy (NPDR) and mild proliferative diabetic retinopathy (PDR). Effects on diabetic macular edema will be explored as a secondary outcome. A number of retinal centers across the US are active and recruiting eligible diabetic retinopathy patients.