The article “Gene therapy knockdown of VEGFR2 in retinal endothelial cells to treat retinopathy”, written by “Aaron B. Simmons, Colin A. Bretz, Haibo Wang, Eric Kunz, Kassem Hajj, Carson Kennedy, Zhihong Yang, Thipparat Suwanmanee, Tal Kafri and M. Elizabeth Hartnett”, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 05 May 2018 without open access. Here, KDR is linked to retinal disorder.