Tocilizumab for cystoid macular edema secondary to retinitis pigmentosa

Purpose To describe the effect of tocilizumab (TCZ) on cystoid macular edema (CME) and retinal vascular leakage (RVL) in retinitis pigmentosa (RP). Methods Retrospective case series. Results We present 2 cases of RP with marked inflammatory features in the form of CME and RVL. There was initial diagnostic uncertainty with posterior uveitis. Both patients were treated with corticosteroids, conventional disease-modifying antirheumatic drugs (cDMARDs), and biological DMARDs (bDMARDs) for the inflammatory features with partial and inconsistent treatment response. When treatment was switched to intravenous (IV) TCZ, dramatic reduction in CME and RVL were observed in both patients. Diagnosis of RP was eventually made based on findings of ancillary tests (macular spectral-domain optical coherence tomography, visual fields, full-field electroretinogram). Genetic testing led to a molecular diagnosis of EYS -related autosomal recessive RP in patient 1, while patient 2 had negative gene panel results. Conclusions IV TCZ can be an effective treatment option in RP-related CME and RVL. Whether this treatment strategy has an effect on prognosis remains to be established, but it is possible considering chronic CME-related retinal damage is a major driver of central vision loss in RP.