Ocular Immunology
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Emerging Treatments for Non-infectious Uveitis

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Published Online: Oct 17th 2018 US Ophthalmic Review. 2018;11(2):81–6 DOI:
Authors: Alay S Banker, Carlos Pavesio, Pauline Merrill
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The primary goals of treatment in patients with non-infectious uveitis (NIU) are to control ocular inflammation and prevent sight-threatening complications such as macular edema and glaucoma. Systemic corticosteroids are the mainstay of treatment in NIU of the posterior segment (NIU-PS); however, long-term use is associated with treatment-limiting adverse effects. The need for agents with improved safety and tolerability coupled with recent insights into the pathogenesis of NIU-PS have led to the development of novel targeted interventions that potentially reduce or eliminate systemic corticosteroid exposure. Targeted interventions include intraocular drug delivery systems that provide high local concentrations at the site of inflammation with low systemic exposure and therapeutic agents, such as monoclonal antibodies that target specific pro-inflammatory cytokines and cytokine-mediated signaling pathways. The expanding range of therapeutic options enhances the ability to tailor therapy according to individual patient circumstances and optimize outcomes in patients with NIU-PS.


Clinical trial, corticosteroid, cytokines,
disease management, immunosuppressive
agent, intraocular injection, intravitreal,
monoclonal antibody, intravitreal, uveitis


Uveitis comprises a range of intraocular inflammatory conditions of both infectious and non-infectious origin that can result in irreversible ocular damage and impaired vision or blindness.1 Effective management is therefore vitally important to prevent ocular damage and preserve visual acuity and quality of life.1–3

Therapeutic management of uveitis is dictated by etiology and anatomic location.1 Infectious uveitis requires treatment of the underlying infectious pathogen, whereas treatment of non-infectious uveitis (NIU) is directed at controlling ocular inflammation. Anterior uveitis is typically managed with topical corticosteroids; however, treatment of posterior uveitis usually requires local and/or systemic therapy due to the limited penetration of topical agents into the posterior segment.1,2 Systemic corticosteroids are often prescribed as the initial treatment for NIU of the posterior segment (NIU-PS), but long-term use is associated with significant adverse effects that generally preclude prolonged administration.2,4

The treatment-limiting adverse effects of conventional therapies coupled with emerging insights into the pathogenesis of NIU have led to the development of novel, targeted therapeutic interventions for NIU-PS. Such interventions include agents aimed at a specific molecular pathway as well as therapies that utilize targeted delivery systems to achieve high therapeutic concentrations at the site of inflammation, and thereby minimize systemic exposure. Currently available therapies, including both targeted and non-specific agents, have been extensively reviewed elsewhere.2,4–7 This article provides an overview of novel emerging targeted therapies that are currently under clinical investigation for the treatment of NIU-PS.

Systemic therapies

Evidence from experimental models of uveitis suggests that proinflammatory cytokines such as interleukin (IL)-6 and IL-23 promote the activation and clonal expansion of T helper (TH) cells, particularly TH17 cells, which weaken the blood–retinal barrier and allow leukocytes to enter and damage ocular tissues (Figure 1).8–10 Studies in patients with uveitis have shown elevated levels of IL-6, IL-10, IL-17, IL-22, IL-23, and tumor necrosis factor alpha (TNFα), supporting the hypothesis that TH17-effector cytokines are central mediators of ocular inflammation and thus potential therapeutic targets.11 These and other observations have led to the investigation of several systemic agents that target key mediators of inflammatory pathways for the treatment of NIU-PS (Table 1).


Sarilumab (Kevzara®; Sanofi, Paris, France) is a human monoclonal antibody that binds to the IL-6 receptor and inhibits IL-6-mediated signaling.12,13 Sarilumab is currently approved for the treatment of rheumatoid arthritis.12 Animal studies have shown that IL-6-deficient mice are partially protected against induction of experimental autoimmune uveitis, and systemic administration of an anti-IL-6 antibody to mice attenuates experimental autoimmune uveitis.14 The clinical efficacy of sarilumab in patients with NIU-PS was recently evaluated in Phase II Study to Analyze Sarilumab in Non-infectious Uveitis (SARILNIUSATURN; identifier: NCT01900431), a multinational, phase II, randomized, double-masked, placebo-controlled trial. A total of 58 patients received either subcutaneous sarilumab 200 mg or placebo every 2 weeks for 52 weeks. Preliminary results showed no statistically significant difference in the proportion of patients achieving a ≥2-step reduction in vitreous haze (VH) score at week 16, as assessed by a reading center, or a prednisone dose of <10 mg/day (primary endpoint), but suggested a potential benefit in reducing uveitic macular edema.15 Ocular serious adverse events occurred in one patient (2.6%) in the sarilumab group (uveitis) and one (5.0%) in the placebo group (increased intraocular pressure [IOP]). Final published results from the SARILNIUSATURN study are not yet available.


Tocilizumab (Actemra®; Genentech, San Francisco, CA, US), a humanized monoclonal antibody against the IL-6 receptor, is approved for the treatment of rheumatoid arthritis, juvenile idiopathic arthritis, giant cell arteritis, and cytokine release syndrome.16 The effect of tocilizumab in patients with NIU was evaluated in a phase I/II, open-label, randomized clinical trial, Study of the Safety, Tolerability, and Bioactivity of Tocilizumab On Patients With Non-infectious UVEITIS: The STOP-UVEITIS Study (STOP-Uveitis; identifier: NCT01717170).17 A total of 37 patients received intravenous infusions of tocilizumab (4 or 8 mg/kg) every 4 weeks for 6 months. The primary outcome was the incidence and severity of systemic and ocular adverse events at month 6. Adverse events were generally consistent with observations from prior studies.16 Two patients in the 8 mg/kg dose group experienced neutropenia after the first dose of tocilizumab, one of whom discontinued study treatment. The most common ocular adverse event was increased IOP, which occurred in three eyes. One patient in each dose group received rescue therapy due to worsening inflammation. Analysis of efficacy outcomes at month 6 showed improvements in best corrected visual acuity (BCVA; mean change: +10.9 letters [4 mg/kg] and +5.5 letters [8 mg/kg]), VH score (mean change: -0.63 [4 mg/kg] and -0.91 [8 mg/kg]), and central macular thickness (mean change: -131.5 mm [4 mg/kg] and -38.92 mm [8 mg/kg]). Additionally, tocilizumab appeared to have a corticosteroid-sparing effect, with all but one of the seven patients who required systemic corticosteroids at baseline discontinuing treatment by month 6. Based on the findings, the authors concluded that further evaluation of tocilizumab in patients with NIU-PS is warranted.17 Notably, a recent prospective observational cohort study based on data from the British Society for Rheumatology Biologics Register found that tocilizumab was associated with a higher risk of serious infection compared with other biologic therapies in patients with rheumatoid arthritis.18


Ustekinumab (Stelara®; Janssen Biotech, Inc., Horsham, PA, US) is a human monoclonal antibody that binds to the p40 subunit of both IL-12 and IL-23, thereby disrupting IL-12- and IL-23-mediated signaling.19,20 Ustekinumab is approved for the treatment of plaque psoriasis, psoriatic arthritis, and Crohn’s disease. A small, non-randomized, uncontrolled, open-label pilot study ( identifier: NCT02911116) evaluating ustekinumab in patients with NIU-PS was initiated in September 2016. Up to seven patients will receive subcutaneous injections of ustekinumab 90 mg at baseline and at weeks 2 and 4. Preliminary results for the first four patients enrolled in the study were presented at the 2018 annual meeting of the Association for Research in Vision and Ophthalmology (ARVO).21 Early analyses showed evidence of benefit in three patients with no significant adverse events reported during 28 weeks of follow up. The study is ongoing and is expected to be completed in December 2018.


Filgotinib (Gilead Sciences, Inc., Foster City, CA, US) is an oral Janus kinase 1 (JAK1) inhibitor that is currently in phase III development for the treatment of rheumatoid arthritis and inflammatory bowel disease.22,23 IL-6, a proinflammatory cytokine involved in the pathogenesis of NIU-PS,11 acts through a JAK1-mediated signaling pathway,24 suggesting a potential therapeutic role for JAK1 inhibition in NIU-PS. Based on this evidence, a multicenter, phase II, double-masked, randomized, placebo-controlled trial ( identifier: NCT03207815) is currently under way to evaluate the safety and efficacy of filgotinib in patients with active NIU. Patients will receive 200 mg oral filgotinib once daily, or placebo, for up to 52 weeks. The primary outcome measure will evaluate the proportion of patients meeting at least one of the pre-defined criteria for treatment failure at week 24 based on assessments of BCVA, VH, anterior chamber cell grade, and inflammatory lesions. The study is expected to be completed in July 2022.

Repository corticotropin injection

Repository corticotropin injection (Acthar® gel; Mallinckrodt Pharmaceuticals, Hampton, NJ, US) is an adrenocorticotropic hormone analogue with anti-inflammatory effects. It is currently used to treat a wide range of inflammatory and autoimmune diseases, including diffuse posterior uveitis.25–27 A phase II, open-label, randomized clinical trial ( identifier: NCT02931175) evaluating the bioactivity and safety of repository corticotropin injection in patients with NIU was initiated in January 2017. Patients will receive treatment with repository corticotropin 80 U/day, administered subcutaneously either two or three times per week for up to 12 months. The primary outcome measures include the incidence of ocular and systemic adverse events at 6 and 12 months.

Intraocular drug delivery

Targeted delivery of therapeutic agents via intraocular administration yields high therapeutic concentrations at the site of inflammation with potentially lower systemic exposure than oral or intravenous administration. Current routes of intraocular drug delivery include intravitreal injections and corticosteroid implants. Suprachoroidal injections, which utilize the naturally occurring suprachoroidal space between the sclera and choroid as a therapeutic reservoir, represent another potential option.2,28 The following section provides an overview of emerging local therapies for patients with NIU-PS (Table 2).45

Corticosteroid implants

Intravitreal corticosteroid injections have been shown to improve visual acuity and reduce inflammation in patients with NIU-PS; however, repeated injections are necessary to maintain the effect.29,30 Repeated intravitreal injections are generally well tolerated, but have been associated with transient increases in IOP post-injection, cataract formation, endophthalmitis, and retinal detachment.2,29,30 Corticosteroid implants are designed to provide local sustained release of drug over periods ranging from 6 months to 3 years, thereby reducing the need for repeat administration.2,5 Two sustained-release corticosteroid implants are currently approved for the treatment of NIU-PS (Retisert®; Bausch + Lomb, Bridgewater, NJ, US; Ozurdex®; Allergan, Inc., Irvine, CA, US) and two additional corticosteroid implants are in late-stage clinical development for the treatment of NIU-PS (YUTIQ™; EyePoint Pharmaceuticals, Inc., Watertown, MA, US; Iluvien®; Alimera Sciences, Inc., Alpharetta, GA, US).

YUTIQ is an injectable intravitreal micro-implant containing 0.18 mg of fluocinolone acetonide that provides sustained drug delivery for up to 3 years. In contrast to the surgically implanted 0.59 mg fluocinolone device (Retisert), it is implanted via an injection that can be administered in the office setting.31 Two recent phase III, multicenter, randomized, placebo-controlled trials evaluated the efficacy and safety of the fluocinolone acetonide 0.18 mg micro-implant in patients with NIU-PS ( identifiers: NCT01694186 and NCT02746991). Published results are not yet available; however, pooled 6-month results from the two trials (N=282) presented at the 2018 ARVO meeting showed improvements in the rate of uveitis recurrence (26.6% versus 73.4%; p<0.001) and visual acuity (mean change: +6.0 versus +4.4 letters) in implanted eyes compared with sham-treated eyes.32 However, IOP elevation of ≥12 mmHg was more common in implanted eyes compared with sham controls (12.2% versus 4.3%). Based on the results of the phase III trials, a New Drug Application was submitted to the US Food and Drug Administration in January 2018.33

Iluvien is a non-biodegradable, injectable intravitreal device that uses the same delivery platform as the YUTIQ micro-implant, providing sustained release of 0.19 mg fluocinolone acetonide for up to 3 years.34 It is currently approved in the United States and Europe for the treatment of diabetic macular edema.34,35 Pooled data from two randomized, double-masked, sham-controlled studies in patients with diabetic macular edema showed that Iluvien was generally safe and well tolerated.36 Cataract surgery was the most common drug-related serious adverse event, occurring in 41.1% and 7.0% of study eyes in the Iluvien and control groups, respectively. In accordance with a licensing and data sharing agreement with EyePoint Pharmaceuticals, an application seeking an expanded indication for the treatment of NIU-PS was filed in Europe in December 2017 based on the results of the two phase III trials evaluating the YUTIQ 0.18 mg fluocinolone implant.37,38

Suprachoroidal injection

Targeted delivery of therapeutic agents to the suprachoroidal space offers the potential advantage of high sustained drug concentrations in the choroid and retina with minimal exposure in other areas of the eye.28 Two recent trials (Suprachoroidal Injection of CLS-TA in Subjects With Macular Edema Associated With Non-infectious Uveitis [PEACHTREE], identifer: NCT02595398; Suprachoroidal Injection of CLS-TA in Subjects Non-infectious Uveitis [AZALEA], identifier: NCT03097315) investigated the safety and efficacy of 4 mg triamcinolone acetonide administered via suprachoroidal injection using a proprietary injection device (Clearside Biomedical, Alpharetta, GA, US) in patients with NIU (anterior, intermediate, posterior, and panuveitis). PEACHTREE was a phase III, quadruple-masked, sham-controlled trial in 160 patients with macular edema associated with NIU; AZALEA was an open-label safety study in 38 patients with NIU. The trials were completed in January 2018. At the time of writing, published study results were not available; however, in a press release issued in March 2018, the study sponsor announced that the primary endpoint was successfully met in the PEACHTREE trial: ≥15 letter improvement in BCVA at week 24 was observed in 46.9% of patients receiving 4 mg suprachoroidal triamcinolone acetonide every 12 weeks and 15.6% in the sham-control group (p<0.001).39 Administration of suprachoroidal triamcinolone acetonide resulted in a mean reduction from baseline of 157 microns in central subfield thickness at week 24 versus 19 microns in the sham arm (p<0.001).39,40 Treatment was generally well tolerated, although IOP-related adverse events were more common in patients treated with suprachoroidal triamcinolone compared with sham controls (11.5% versus 0%, respectively).

Intravitreal sirolimus

Sirolimus is an immunomodulatory agent that inhibits the mammalian target of rapamycin (mTOR), a protein kinase involved in the regulation of T-cell activation, proliferation, and differentiation, and proinflammatory cytokine production.41,42 Oral sirolimus is currently approved for the prevention of organ rejection following renal transplant and the treatment of lymphangioleiomyomatosis.43 A novel intravitreal formulation that delivers therapeutic concentrations to the eye with minimal systemic exposure has been developed by Santen Inc. (Emeryville, CA, US) and evaluated in clinical trials for the treatment of NIU-PS.44 The Study Assessing Double-masked Uveitis Treatment (SAKURA; identifer: NCT01358266) comprised two sequential phase III, multinational, randomized, double-masked studies assessing the efficacy and safety of intravitreal sirolimus in patients with active NIU-PS. In SAKURA 1,347 patients were randomly assigned to receive one of three doses of intravitreal sirolimus (44, 440, and 880 mg) administered on days 1, 60, and 120.45 A significantly higher proportion of patients in the 440 mg dose group achieved the primary endpoint of a VH score of 0 at month 5 compared with the 44 mg dose group (22.8% versus 10.3%; p=0.025). Likewise, the proportion of patients achieving the secondary endpoint of a VH score of 0 or 0.5+ was significantly higher in the 440 mg group compared with the 44 mg group (52.6% versus 35%; p=0.008). Comparison between the 880 mg and 44 mg dose groups showed no significant difference in the proportion of patients achieving a VH score of 0 (16.4% versus 10.3%; p=0.182). BCVA improved or was maintained in 80% of patients in all dose groups. Logistic regression analysis showed a higher likelihood of improvement in BCVA in patients in the 440 mg group who had low BCVA at baseline; median improvement was +10.5 letters in patients with baseline BCVA of <20/100 (n=46) versus 1.0 letter in those with baseline BCVA of ≥20/40 (n=149). All three doses appeared to have a corticosteroid-sparing effect; 69.6% of patients who required systemic corticosteroids at baseline were able to taper the dosage to ≤5 mg/day (prednisone equivalent) by month 5. Treatment with intravitreal sirolimus was generally well tolerated. There were no clinically significant changes in mean IOP and treatment-related ocular serious adverse events were uncommon in all three groups.45

Collectively, the efficacy and safety results from the first trial suggested that the 440 mg dose offered the most favorable benefit/risk profile in the treatment of NIU-PS. Based on this finding, the protocol for the second trial was amended to terminate further investigation of the 880 mg dose. The primary endpoint (VH=0 at month 5 response) in the 440 mg group in SAKURA 2 was consistent with what was reported in the first trial, but the difference did not reach statistical significance when compared with the 44 mg group (19.1% versus 17.6%; p=0.783).46 Santen Inc. is planning a new phase III trial evaluating intravitreal sirolimus in patients with NIU-PS.

Intravitreal infliximab

Infliximab (Remicade®; Janssen Biotech, Horsham, PA, US) is a chimeric monoclonal antibody to TNFα that is currently approved for the treatment of a variety of inflammatory and autoimmune conditions.47 Systemic administration of infliximab is associated with toxicities such as heart failure, exacerbation of multiple sclerosis, and tuberculosis reactivation; however, targeted delivery of infliximab via intravitreal injection results in increased local concentrations with reduced systemic exposure.48 In a prospective case series including 10 eyes from seven patients with chronic NIU, intravitreal injection of infliximab 1.5 mg improved mean BCVA, VH score, and central macular thickness at 4 weeks.49 Subsequent analysis of long-term outcomes in the same cohort showed that the benefit was transient; mean BCVA, VH score, and central macular thickness returned to pre-treatment values by month 6. No significant ocular or systemic complications were reported in this series.48 At the time of writing, there were no active clinical trials evaluating intravitreal infliximab in patients with NIU-PS.

Intravitreal ranibizumab

Ranibizumab (Lucentis®; Genentech, San Francisco, CA, US) is a monoclonal antibody that inhibits the biologic activity of vascular endothelial growth factor A.50 Intravitreal ranibizumab is currently indicated for the treatment of neovascular age-related macular degeneration, retinal vein occlusion, diabetic macular edema, diabetic retinopathy, and myopic choroidal neovascularization.50 In a prospective case series of seven patients with uveitis and refractory central macular edema, intravitreal ranibizumab (0.5 mg) administered monthly for 3 months resulted in significant improvements in BCVA (mean change: +13 letters; p=0.03) and central retinal thickness (mean change: -357 µm; p=0.03) at 3 months compared with baseline.51 Most patients required reinjection after 3 months; however, the improvements in BCVA and central retina thickness were maintained at 6 months. Treatment was generally well tolerated, with no evidence of significant ocular or systemic adverse effects. A phase III, randomized comparative trial (Macular Edema Ranibizumab v. Intravitreal Anti-inflammatory Therapy Trial [MERIT], identifier: NCT02623426) evaluating treatment with either intravitreal ranibizumab, intravitreal methotrexate, or a dexamethasone implant in 240 patients with NIU-associated macular edema is currently underway and expected to be completed in July 2019.

Intravitreal methotrexate

Methotrexate is a cytotoxic agent that exhibits dose-dependent inhibitory effects on neutrophils, macrophages, and T-cells.52–55 A pilot study evaluating intravitreal methotrexate (400 µg) in 15 patients with NIU showed statistically significant improvements in visual acuity, VH score, and macular thickness compared with baseline.56 Five of 13 patients who responded to treatment relapsed after a median duration of 4 months; all four patients who received a repeat injection experienced improved visual acuity following reinjection. Mild ocular pain was the only injection-related adverse event and no patient experienced increased IOP. In a subsequent retrospective case series of 30 patients with NIU, 79% of treated eyes showed improvement in BCVA, ocular inflammation, or central macular thickness over assessment intervals of varying duration.57 Eight of 30 eyes that responded to initial treatment relapsed (median time to relapse, 3 months); of these eyes, all 8 responded to repeat injection. The median duration of remission in the remaining 22 eyes was 17 months. Eight of 14 patients (57%) who were receiving concomitant therapy with systemic corticosteroids were able to reduce the dose following treatment with intravitreal methotrexate. Treatment appeared to be generally well tolerated; however, adverse events were not prospectively assessed. As noted above, a randomized trial comparing intravitreal methotrexate with either intravitreal ranibizumab or a corticosteroid implant in patients with uveitic macular edema is ongoing.

Intravitreal tesidolumab/LFG316

Tesidolumab/LFG316 (Novartis Pharmaceuticals; Basel, Switzerland) is a monoclonal antibody against the complement 5 protein.58 A recent phase II, multicenter, randomized, controlled, open-label study ( identifer: NCT01526889) evaluated the safety, efficacy, and pharmacokinetics of intravitreal tesidolumab/LFG316 in patients with active NIU-PS. Patients were randomized to treatment with tesidolumab/LFG316 or conventional immunosuppressive therapy for 12 weeks; patients who met the criteria for treatment response at week 12 were permitted to continue study treatment for an additional 6 months. The study was completed in December 2017; however, published results are not yet available.

pEYS606 gene therapy

pEYS606 (Eyevensys SAS; Paris, France) is a DNA plasmid that encodes for a fusion protein of the TNFα receptor and immunoglobulin G.59 The pEYS606 plasmid solution is administered by electrotransfection into the ciliary muscle cells using a proprietary disposable electroporation device. Ciliary muscle cells exhibit high transfection efficiency and subsequent protein synthesis in various animal models, and preclinical studies have shown pEYS606 to be efficacious in animal models of uveitis.60 A phase I/II, open-label, multicenter, dose-escalation study evaluating the safety, tolerability, and clinical activity of pEYS606 in 24 patients with NIU-PS ( identifer: NCT03308045) is currently underway in the UK and France, and is expected to be completed in December 2019.


The primary goals of therapy in patients with chronic NIU-PS are to achieve durable control of ocular inflammation and prevent sight-threatening complications.1,2 Treatment-limiting systemic adverse effects associated with conventional therapies have prompted the development of therapies that allow targeted local delivery of drugs to the site of inflammation, while insights regarding the pathogenesis of NIU have led to the emergence of therapies that target specific mediators of autoinflammatory pathways. The expanding range of targeted therapeutic options in development for the management of NIU is promising and will serve to enhance the ability to tailor therapy according to individual patient circumstances, while offering the potential for improved outcomes with reduced systemic exposure to corticosteroids.

Article Information:

Alay S Banker is a consultant for
Santen, Inc. Carlos Pavesio has received personal
fees from Alimera, Allergan, Kowa, Novartis and
Santen. Pauline Merrill has received grants from
Abbvie, Clearside, Eyegate and Santen and personal
fees from Abbvie Allergan, pSividia and Santen.

Review Process

Double-blind peer review.
Compliance with Ethics: This study involves a review of
the literature and did not involve any studies with human
or animal subjects performed by any of the authors.


The named author meets the International
Committee of Medical Journal Editors (ICMJE) criteria
for authorship of this manuscript, takes responsibility
for the integrity of the work as a whole, and has given
final approval for the version to be published.


Alay S Banker, Banker’s
Retina Clinic and Laser Centre, 5 Subhash Society,
Behind Ishvar Bhuvan, Navrangpura, Ahmedabad,
Gujarat, India 380009. E:


The publication of this article
was supported by Santen, Inc.


This article is published under the Creative
Commons Attribution Non-commercial License, which
permits any non-commercial use, distribution, adaptation,
and reproduction provided the original author and source
are given appropriate credit. © The Authors 2018.


Editorial assistance was
provided by Alexander Simon and Kenneth
Glasscock of BioScience Communications (New
York, NY, US) and funded by Santen, Inc.




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