Subcutaneous Tocilizumab for Cystoid Macular Edema Secondary to Juvenile Idiopathic Arthritis (JIA)-associated Uveitis: A Case Report

Subcutaneous Tocilizumab in Juvenile Idiopathic Arthritis Associated Uveitis

AIM

To describe the efficacy and safety of subcutaneous tocilizumab (SC-TCZ) in a cohort of juvenile idiopathic arthritis (JIA) patients with refractory uveitis.

METHODS

Retrospective observational monocentric study including patients with JIA-associated uveitis treated with SC-TCZ.

RESULTS

Thirteen patients were enrolled. The rate of uveitis flare/year per each patient was 1.6 ± 2.0 on the last bDMARDs before SC-TCZ, while it decreased to 0.4 ± 0.7 on SC-TCZ. Nine out of thirteen patients (69%) required the introduction of SC-TCZ only for active uveitis at baseline. Among these patients, five (56%) achieved complete treatment response. No uveitis relapses were observed in patients (4/13, 31%) requiring the introduction of SC-TCZ for active arthritis during follow-up (30.48 ± 21.6 months). Overall, SC-TCZ was safe, and no side effects were observed during the treatment.

CONCLUSION

SC-TCZ can be effective and safe in patients with JIA and uveitis recalcitrant to several bDMARDs.

Tocilizumab in Juvenile Idiopathic Arthritis Associated Uveitis, a Narrative Review

Juvenile idiopathic arthritis (JIA) associated uveitis (JIA-U) is the most common extra-articular manifestation of JIA, affecting 10–15% of patients, especially in oligoarticular JIA where its course may be faint. Therefore, JIA-U is one of the most challenging pediatric uveitis, associated with major ocular morbidity and possibly leading to irreversible structural ocular damage and to vision-threatening complications. Adequate management is crucial for avoiding visual impairment complications. Since the introduction of biologic disease modifying anti-rheumatic drugs (bDMARDS), the visual prognosis of JIA-U has dramatically improved over the decades. Tumor necrosis factor-α (TNF-α) blockers are the most used bDMARDs in treating JIA-U with large evidence of efficacy. However, inadequate response to these agents, either due to intolerance or inefficacy, may be observed, requiring a swap to other classes of immunosuppressive agents, including anti-IL-6, anti-CD20, and, more recently, JAK inhibitors. Tocilizumab is a humanized monoclonal antibody to the interelukin-6 receptor preventing IL-6 from binding to its soluble and membrane-bound receptors. A growing body of literature provides promising results about the efficacy of intravenous and subcutaneous tocilizumab in the treatment of JIA-U. A narrative review of the literature on this topic will improve our knowledge on the potential use of tocilizumab in JIA-U.

Anti-interleukin-6 receptor therapy with tocilizumab for refractory pseudophakic cystoid macular edema

Purpose

To describe the clinical course of a patient with refractory pseudophakic cystoid macular edema treated with interleukin-6 receptor antagonist tocilizumab.

Observations

An 80-year-old Caucasian man with past ocular history significant for glaucoma (right eye) and iritis presented with cystoid macular edema (CME) in the right eye (OD). His ocular surgery history was significant for cataract extraction with posterior chamber intraocular lenses in 1999 and YAG laser capsulotomy in 2014 in both eyes (OU). His medications at time of presentation included latanoprost and dorzolamide-timolol in OD for glaucoma, as well as prednisolone in OD for iritis. Upon examination, his visual acuity was 20/250 in OD and 20/20 in the left eye (OS). Intraocular pressure was 20 mmHg in OD and 10 mmHg in OS. Slit-lamp examination revealed no cells or flare in OU. Dilated fundus exam showed CME and a cup-to-disk ratio of 0.9 in OD and normal findings in OS. Initial spectral domain optical coherence tomography (SD-OCT) demonstrated intraretinal fluid in both outer and inner layers as well as mild subretinal fluid with an intact ellipsoid zone in OD. Fluorescein angiography revealed perifoveal leakage in OD. Laboratory evaluations, including infectious work-up, were unremarkable. While the patient's CME initially improved after initiation of therapy with topical prednisolone and oral acetazolamide, the CME later recurred after systemic acetazolamide was stopped due to intolerable side effects. Despite multiple therapeutic approaches, including topical and systemic corticosteroids (both oral and intravenous) and topical interferon α2b over the course of more than one year, the patient's visual acuity continued to worsen with increasing intra- and subretinal fluid in the macula. Due to the refractory CME, the patient was started on monthly infusions of anti-interleukin (IL)-6 receptor tocilizumab (8 mg/kg) with three days of methylprednisolone infusions (500 mg/day). After nine cycles of treatment, SD-OCT demonstrated restoration of normal foveal contour with complete resolution of CME.

Conclusions and Importance

IL-6 inhibition with tocilizumab may be a safe and effective treatment for refractory CME. Further studies are needed to elucidate the nature and extent of therapeutic IL-6 inhibition in CME.