Dose-Dependent and Reversible Serous Retinal Detachments in Fibroblast Growth Factor Receptor Inhibitor-Associated Retinopathy

We report two cases of fibroblast growth factor receptor (FGFR) inhibitor-associated retinopathy, including the first case of Debio 1347 associated retinopathy manifesting with bilateral serous retinal detachments along the superotemporal arcades and a case of erdafitinib associated retinopathy manifesting with classic foveal serous retinal detachments. Both cases demonstrate a clear dose-dependent and reversible class effect likely secondary to downstream effects of FGFR inhibition on the MEK pathway, resulting in retinal pigment epithelial cell dysfunction, and may also involve additional mechanisms of cellular injury through inhibition of the PI3K/AKT/mTOR pathway. FGFR inhibitor-associated retinopathy appears to manifest differently among patients. [ Ophthalmic Surg Lasers Imaging Retina 2023;54:368–370.]