Exonate Ltd. is preparing to advance its eye drop candidate to treat retinal vascular diseases, EXN-407, into a phase IIb study following promising tolerability and early signs of efficacy in a phase Ib/IIa study. A small-molecule SRPK1 inhibitor, EXN-407 is designed to be administered twice daily and works by selectively targeting specific (proangiogenic) isoforms of VEGF that lead to vascular retinal disease progression via aberrant growth of leaky blood vessels within the eye.