Accordingly, a prospective study was performed in which the concentrations of VEGFR-1, VEGFR-2, and their ligands (VEGF and placental growth factor (PlGF)) were measured in aqueous humors samples obtained from patients with wet AMD at initiation of IRI, and changes of these factors were evaluated during the first course of IRI treatment. This evidence concerns the gene PGF and wet macular degeneration.