A total of 26 studies investigating VEGF-A levels before and after ROP treatment were identified30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55 (Table 2). The gene discussed is VEGFA; the disease is retinopathy of prematurity.