Update on the use of systemic biologic agents in the treatment of noninfectious uveitis
Sirichai Pasadhika,1 James T Rosenbaum2
1Department of Ophthalmology, Southern Arizona Veterans Administration Health Care System, Tucson, AZ, USA; 2Legacy Devers Eye Institute, Portland, OR, USA
Abstract: Uveitis is one of the leading causes of blindness worldwide. Noninfectious uveitis may be associated with other systemic conditions, such as human leukocyte antigen B27-related spondyloarthropathies, inflammatory bowel disease, juvenile idiopathic arthritis, Behçet's disease, and sarcoidosis. Conventional therapy with corticosteroids and immunosuppressive agents (such as methotrexate, azathioprine, mycophenolate mofetil, and cyclosporine) may not be sufficient to control ocular inflammation or prevent non-ophthalmic complications in refractory patients. Off-label use of biologic response modifiers has been studied as primary and secondary therapeutic agents. They are very useful when conventional immunosuppressive therapy has failed or has been poorly tolerated, or to treat concomitant ophthalmic and systemic inflammation that might benefit from these medications. Biologic therapy, primarily infliximab, and adalimumab, have been shown to be rapidly effective for the treatment of various subtypes of refractory uveitis and retinal vasculitis, especially Behçet's disease-related eye conditions and the uveitis associated with juvenile idiopathic arthritis. Other agents such as golimumab, abatacept, canakinumab, gevokizumab, tocilizumab, and alemtuzumab may have great future promise for the treatment of uveitis. It has been shown that with proper monitoring, biologic therapy can significantly improve quality of life in patients with uveitis, particularly those with concurrent systemic symptoms. However, given high cost as well as the limited long-term safety data, we do not routinely recommend biologics as first-line therapy for noninfectious uveitis in most patients. These agents should be used with caution by experienced clinicians. The present work aims to provide a broad and updated review of the current and in-development systemic biologic agents for the treatment of noninfectious uveitis.
Keywords: biologics, monoclonal antibody, eye
The term “uvea” comes from the Latin word for grape. The eye includes three layers. The middle layer, or uvea, encompasses the iris, ciliary body, and choroid. Inflammation of the uvea is termed uveitis, but it is usually diagnosed on the basis of inflammation in adjacent structures which include the anterior chamber, the vitreous humor, or the retina. Inflammation in the uvea can be due to infections, masquerades such as B-cell lymphoma, or immune-mediated diseases. The latter can be a systemic disease such as sarcoidosis or a disease confined to the eye such as sympathetic ophthalmia. Anatomic classification of uveitis is extremely useful, since the differential diagnosis is distinct for anterior, intermediate (involving the vitreous humor), posterior (involving the retina or choroid), and panuveitis.1
Uveitis is the third leading cause of blindness in the developed countries. The annual incidence is estimated between 17 and 52 per 100,000 persons, and the prevalence is 38–714 per 100,000 persons.2 The incidence and prevalence vary among different geographic locations worldwide. Males and females are generally equally affected overall, but sex preponderance may be observed in some uveitis groups, such as male predominance in human leukocyte antigen (HLA)-B27-associated uveitis and female preponderance in juvenile idiopathic arthritis (JIA)-related uveitis. Uveitis may occur at any age, but most commonly affects the working population aged between 20 and 59 years. Childhood uveitis is relatively less common, but may cause long-term severe visual loss.2 Therefore, the burden of this sight-threatening condition is very significant.
The most common symptoms of uveitis are decreased vision, eye pain, redness, light sensitivity, and floaters. The redness and eye pain are generally seen in eyes with acute anterior inflammation, but may not be prominent in chronically inflamed eyes or those in which the inflammation is confined only to the posterior segment. Uveitis is typically an immune-mediated condition, which involves chemical mediators resulting in vascular dilation (conjunctival injection), increased vascular permeability (aqueous flare), and chemotaxis of inflammatory cells into the eye (aqueous and vitreous cellular response). With variable chronicity and severity, uveitis may be complicated by cataract, glaucoma, band keratopathy, hyphema, vitreous hemorrhage, cystoid macular edema (CME), retinal detachment, retinal ischemia, optic atrophy, chronic eye pain, and blindness.
Conventional therapy for uveitis
Uveitis can be caused by infectious and noninfectious etiologies. Causative infectious origins may include bacteria, viruses, fungi, and parasites. The precise diagnosis is crucially important to establish an appropriate therapy. Specific antimicrobial treatment is typically required for infectious uveitis. In rare occasions, neoplastic diseases (eg, lymphoma) may masquerade as ocular inflammation, and an appropriate diagnosis is needed for proper management.
For noninfectious uveitis, excluding masquerade neoplasms, the control of inflammation is the key to treatment success. We generally use a stepladder approach; the treatment includes local corticosteroids, systemic corticosteroids, and systemic immune modulators, often sequentially starting with topical therapy. Noninfectious uveitides are often associated with other systemic conditions, such as HLA-B27-related spondyloarthropathies, inflammatory bowel disease (IBD), JIA, Behçet’s disease (BD), and sarcoidosis. The treatment of systemic symptoms may also improve ocular inflammation.
Topical corticosteroids are generally the initial treatment of choice for anterior uveitis, but they are not effective for the inflammation involving the posterior segment (behind the lens). Local corticosteroid therapy (eg, periocular and intravitreal corticosteroid injections, as well as corticosteroid implant devices) may be used in patients with posterior inflammation, especially those with monocular involvement. Topical and local corticosteroid therapies are notoriously known to potentially cause glaucoma and cataract. Systemic corticosteroids are often the mainstay of therapy for uveitis that involves the posterior segment, particularly when uveitis affects both eyes. Chronic use of moderate to high dose systemic corticosteroids can result in many serious side effects – impaired glucose tolerance, hypertension, fluid retention, osteoporosis, mental disturbance, impaired wound healing, gastrointestinal bleeding and perforation, thromboembolic disorders, weight gain, glaucoma, and cataract, for example. In cases that do not respond adequately to initial corticosteroid treatment or cases in which patients may develop serious corticosteroid-induced side effects, systemic corticosteroid-sparing immunomodulatory agents should be initiated.
Systemic immunomodulatory medications used for ocular inflammatory conditions include conventional immunosuppressive agents and biologic response modifiers. Examples of conventional systemic immunosuppressive agents used for uveitis and their common adverse effects are listed in Table 1. These agents include antimetabolites, inhibitors of T-cell signaling, and alkylating agents.3 Since they can cause potentially serious side effects, the patients must be monitored closely by experienced practitioners. With appropriate monitoring, immunosuppressive agents may effectively control ocular inflammation with acceptable safety profiles.4–8
Table 1 Examples of conventional systemic immunosuppressive agents that may be used for the treatment of noninfectious uveitis
Systemic biologic therapy for noninfectious uveitis
Biologic response modifiers, or so-called biologics, are the relatively new medications studied and used for the treatment of noninfectious uveitis and other ocular inflammatory diseases. We define a biologic as a medication which is manufactured by recombinant DNA (deoxyribonucleic acid) technology and which is designed to be effective based on a molecular understanding of disease pathogenesis. Biologics includes monoclonal antibodies, soluble receptors, cytokines themselves (such as interferons [IFNs]), and natural cytokine antagonists (such as anakinra). Biologic therapy can be an alternative in patients with inadequate response to or intolerance of conventional immunotherapy.
Biologics were developed and approved to treat systemic inflammatory diseases (eg, BD, JIA, ankylosing spondylitis [AS], psoriasis, psoriatic arthritis [PsA], ulcerative colitis [UC], Crohn’s disease [CD], and rheumatoid arthritis [RA]) or to prevent organ transplant rejection. To date, none of the biologics discussed herein have been approved in the US for the treatment of uveitis, but they have been used off-label to treat uveitis or ocular inflammation. The clinical data have appeared primarily in case reports and series, and less frequently from clinical trials. The most commonly studied systemic biologics for uveitis to date are tumor necrosis factor (TNF)-α inhibitors, primarily infliximab, and adalimumab. Table 2 summarizes examples of biologics used in ophthalmology, dosage, route of administration, and their potential side effects.
Table 2 Characteristics, route of administration, dosage, and potential side effects for selected biologic agents
One of the most successful biological approaches to disease is the inhibition of vascular endothelial growth factor (VEGF) within the eye since VEGF is strongly implicated in ocular neovascularization. VEGF is a contributor to CME, and many investigators have reported their experience with the local injection of a VEGF inhibitor to treat CME secondary to uveitis. Since the rationale is to treat a complication of the uveitis rather than the uveitis itself, we have elected to omit a discussion of this important class of biologics from this review.
Infliximab (Remicade®, Janssen Biotech, Inc., Horsham, PA, USA) is a chimeric monoclonal antibody that binds both circulating and membrane-bound TNF-α. It is approved for the treatment of RA, UC, CD, AS, PsA, and plaque psoriasis. Initial studies focused on the treatment of uveitis associated with BD and JIA. Infliximab has been described to be a rapid and very effective therapy for the treatment of BD-related panuveitis,9–11 and retinal vasculitis.12 Sfikakis et al reported in a prospective study of 25 patients with BD-related uveitis that greater than 90% of patients demonstrated resolution of vitritis, CME, retinitis, and retinal vasculitis within 4 weeks after initiating infliximab therapy, and benefit often occurred in under 1 week.12 A prospective, observational study of patients with BD-related panuveitis comparing a single infliximab infusion (5 mg/kg), intravenous methylprednisolone (1 g/day for 3 days), and intravitreal triamcinolone acetonide injection (4 mg), showed that those receiving infliximab achieved significantly faster resolution of retinal vasculitis, retinitis, and CME than those given systemic or intravitreal corticosteroid therapy.13 It was shown to be more effective than conventional immunotherapy for BD-related retinal vasculitis.14
Efficacy of infliximab for JIA uveitis also has been demonstrated in several retrospective studies,15–18 with the majority of patients experiencing rapid control of uveitis after the second infusion.15 Pediatric patients may require higher dose by weight or more frequent infusions compared with adults.19
Besides BD and JIA, infliximab has been reported to be effective for the treatment of uveitis associated with multiple diseases, including sarcoidosis,11,20–23 Vogt-Koyanagi-Harada syndrome (VKH),20 IBD,20,24–26 AS,27 psoriasis,27 and Takayasu disease.28 It may also be effective to treat birdshot chorioretinopathy (BSCR),11,20,29 recalcitrant uveitic CME,30 HLA-B27-related anterior uveitis,27,31,32 pars planitis,11,16 multifocal choroiditis,11 sympathetic ophthalmia,33 diffuse subretinal fibrosis,34 and idiopathic uveitis.11,20,35 Two-year results of a prospective trial for treatment of various uveitides showed that approximately three in four patients experienced initial benefit. Of the responders, there was a 60% retention rate of effectiveness in the first year and also 60% in the second year.36
Regarding sarcoidosis, TNF-α inhibitors may be effective in treating sarcoidosis-related systemic diseases and uveitis as mentioned. However, in patients receiving TNF-α inhibitors for treatment of other immune-mediated diseases, multiple case reports and series suggest that TNF-α inhibitors (infliximab,37–42 etanercept,37,40 and adalimumab40,41,43) may cause sarcoidosis-like conditions. Etiology remains unclear, but paradoxical sarcoidosis appearing during treatment is likely a class-effect of TNF-α inhibitors.44,45 TNF inhibitors analogously are effective for psoriasis, but they have also been reported to cause psoriasiform skin disease.
Infliximab has been reported to effectively treat serpiginous choroidopathy (SC) in two refractory cases;46,47 however, one patient died due to disseminated tuberculosis despite previously negative purified protein-derivative skin test.46 Mackensen et al described a high percentage (52%) of QuantiFERON positivity in 21 serpiginous-like choroiditis patients, suggesting that tuberculosis in a European patient population may play an important etiologic role in some patients.48 Therefore, TNF-α inhibitors should be used with caution in patients with SC.49
In our own open-label study on infliximab for various types of uveitis,36 we encountered a very high rate of adverse reactions including 3 of 31 patients developing drug-induced lupus. Our study was too small to draw definitive conclusions, but we speculate that the combination of very high drug levels resulting from intravenous infusion and a minimal elevation in serum TNF in patients with just localized eye inflammation resulted in the inordinate number of adverse effects.
Adalimumab (Humira®, AbbVie Inc., North Chicago, IL, USA) is a fully human monoclonal antibody against TNF-α. It is approved for the treatment of RA, UC, CD, PsA, plaque psoriasis, AS, and JIA. The route of administration is subcutaneous injection. Initial clinical studies have shown its potential for juvenile uveitis (mainly JIA), and more recent data have also demonstrated promising results in adults. A prospective, noncomparative, nonrandomized study in 14 children with recalcitrant uveitis (nine JIA and five idiopathic) described that improvement of anterior chamber inflammation was seen in 81% of affected eyes.50 A similar retrospective JIA study demonstrated control of uveitis and arthritis activity in more than 80% of cases, with median response time of 3 and 6 weeks for arthritis and uveitis, respectively.51 Adalimumab may be more effective when being used as the first biologic agent in JIA children.52 A retrospective study for JIA uveitis revealed that adalimumab effectively controlled inflammation in 35% of patients refractory to previous treatment with infliximab or etanercept.53
For BD-related uveitis, adalimumab could be an effective alternative for treatment in patients already well-controlled with infliximab wishing to switch from intravenous infusions to subcutaneous injections.54 Adalimumab could be very effective as the first biologic agent for this indication as well.55
A prospective open-label pilot study of adalimumab in 19 adults with various uveitides reported control of inflammation in 63% of patients and complete resolution of CME in 55% of eyes at 1 year of therapy.56 A more recent prospective trial of 31 patients (age range 20–66 years) with refractory uveitis from our group described 68% of subjects as clinical responders at 10 weeks, with 39% retention rate at 1 year.57 A prospective multicenter case series of 131 patients of any age (mean 27 years) also demonstrated that adalimumab therapy may significantly improve anterior chamber and vitreous inflammation with the ability to taper corticosteroids. For the patients with CME, 70% of eyes showed complete resolution of CME at 6 months.58
Adalimumab has been shown to reduce anterior uveitis flares in patients with AS.59 Successful adalimumab therapy has been reported for uveitis associated with sarcoidosis, VKH, CD, and BSCR, as well as idiopathic uveitis.57 Phase III studies on the efficacy and safety studies of adalimumab in the patients with active and inactive uveitis are in progress.
Etanercept (Enbrel®, Immunex Corporation, Thousand Oaks, CA, USA) is a fusion protein of a human Fc molecule and two p75 TNF receptors which binds free TNF-α and -β. It is approved for the treatment of RA, polyarticular JIA, AS, PsA, and plaque psoriasis. Favorable outcomes of etanercept therapy for uveitis have been previously reported.60 A prospective, open-label, multicenter study with median follow-up of 13 months showed that patients with JIA may initially respond to etanercept, but only approximately half of responders had sustained improvement at 1 year.61 Interestingly, etanercept failed to show significant difference in control of anterior chamber inflammation, compared with placebo, in a randomized trial.62 Furthermore, it was not superior to placebo in preventing uveitic relapses in previously controlled patients attempting to taper methotrexate in another randomized study.63 Based on the existing uncontrolled data, infliximab and adalimumab generally are believed to be more effective than etanercept for the treatment of ocular inflammation.64 However, there are no prospective head-to-head studies of the effectiveness or safety among the TNF-α inhibitors.
Just as TNF inhibitors may paradoxically trigger psoriasis or sarcoidosis, uveitis has been reported as a consequence of anti-TNF therapy.65,66 Etanercept appears to be more likely than infliximab or adalimumab to cause this very rare adverse effect.67
Golimumab (Simponi®, Janssen Biotech, Inc) is approved for the treatment of moderate to severe active RA, PsA, AS, and UC. The recommended dose for RA, PsA, and AS is 50 mg by subcutaneous injection every month, with a higher dose for UC (see Table 2). Several case reports and series demonstrated successful control of recalcitrant uveitis associated with JIA,68–70 BD,71 idiopathic retinal vasculitis,68 spondyloarthropathies,72 and HLA-B27 positivity.70
The largest data to date are on the use for JIA-related uveitis in ten patients from three series.68–70 Cordero-Coma et al reported a case with history of infliximab intolerance, and adalimumab failed to control arthritis. Ocular and joint inflammation were successfully controlled after switching to golimumab with concurrent use of methotrexate.68 Similar results were observed in other series.69,70 Miserocchi et al reported that improvement of ocular inflammation may be observed as soon as 2 weeks after initiation of golimumab.70 Like other TNF-α inhibitors, initial response can be prompt; ocular and articular inflammation may subsequently become resistant to golimumab after several months of successful treatment.69 In some occasions, more frequent injections may be required to control uveitis, as seen in a 15-year-old girl whose uveitis flared prior to 4 weeks, and her uveitis was successfully controlled with 3-week injection intervals.69 Golimumab may enable corticosteroids and conventional immunosuppression tapering.68–70
Faez et al showed that golimumab may be effective for uveitis associated with spondyloarthropathies (AS and PsA). In this series, a 31-year-old male with AS and bilateral anterior uveitis was satisfactorily treated with at least 30 months of follow-up. Golimumab may further assist the control of systemic conditions in those with inactive uveitis, as reported in a 7-year-old girl with uncontrolled joint inflammation (PsA), while her panuveitis was quiescent under mycophenolate mofetil therapy.72
Mesquida et al reported successful outcomes in a 28-year-old male with BD-related panuveitis, occlusive retinal vasculitis, and CME. The conditions were inadequately controlled with cyclosporine, infliximab, and prednisone. Golimumab therapy resulted in complete resolution of vitritis and macular edema 5 weeks after switching from infliximab to golimumab. Uveitis remained quiescent after cyclosporine and prednisone tapering up to 6 months of follow-up.71 A similar observation was reported in a 28-year-old man with idiopathic retinal vasculitis from another series.68
As noted above, golimumab seems to be a promising treatment option for various uveitis subtypes based on limited data available to date. All of these cases underwent golimumab therapy after either inadequate response to or intolerance of other biologics, mainly other TNF-α inhibitors. As a relatively new medication, golimumab was used as a primary biologic agent in none of the above reported cases. An open-label, Phase IV study, investigating the incidence of uveitis attacks in participants with AS before and after treatment with golimumab is underway.
Certolizumab (Cimzia®, UCB, Inc., Smyrna, GA, USA) differs from other anti-TNF-α monoclonal antibodies in that it contains the Fab fragment which is bound to polyethylene glycol instead of the Fc fragment for increasing the half-life. It is approved for the treatment of moderate to severe RA, PsA, and CD. A single case report demonstrated its efficacy for the treatment of recalcitrant RA and scleritis in a patient who was intolerant to infliximab and rituximab therapy.73 To date, there are no reports on its use for uveitis or other ophthalmic conditions.
Daclizumab (T-lymphocyte inhibitor)
Daclizumab (Zenapax®, Genentech, Inc., South San Francisco, CA, USA) is a monoclonal antibody which binds the interleukin (IL)-2α receptor subunit expressed by most T- and B-lymphocytes and natural killer cells. It was used for the prophylaxis of organ transplant rejection. A Phase I/II open-label study of intravenous daclizumab (1 mg/kg every 4 weeks) for the treatment of noninfectious intermediate and posterior uveitis demonstrated improvement of inflammation and visual acuity at 1 year in 80% of patients,74 which was sustained after 4 years of therapy.75 Increased uveitic flares were observed with reduction to 6-weekly infusions compared with 2–4-weekly infusions. Some patients were transitioned to subcutaneous daclizumab therapy after 4 years of intravenous infusions, with most patients maintaining good response.75 Two-third of patients who received subcutaneous daclizumab injections (2 mg/kg, followed by 1 mg/kg maintenance every other week) in a subsequent study achieved at least 50% reduction of concurrent immunosuppression, with retained baseline visual acuity and control of uveitis.76
For some specific uveitis groups, intravenous daclizumab (1 mg/kg) at 2-week intervals has been shown to be effective for refractory BSCR in a retrospective study, with seven of eight patients achieving complete resolution of vitreous inflammation and stabilization or improvement of visual acuity in both eyes. Resolution of retinal vasculitis on fluorescein angiography was observed in 75% of the subjects.77 Higher intravenous doses were also used for JIA uveitis, BSCR, idiopathic panuveitis, intermediate uveitis, and VKH.78,79 However, daclizumab failed to demonstrate effectiveness in BD-associated uveitis in a randomized trial, with the placebo group experiencing greater reduction in immunosuppressive agents.80
Despite promising results in managing uveitis, daclizumab was discontinued by the manufacturer in 2009 due to diminishing market demand with available alternative treatments, and presumably not due to its safety concerns.
Rituximab (B-lymphocyte inhibitor)
Rituximab (Rituxan®, Genentech, Inc.) is a CD20-directed cytolytic antibody indicated for the treatment of non-Hodgkin’s lymphoma, chronic lymphocytic leukemia, RA, granulomatosis with polyangiitis (formerly Wegener’s granulomatosis), and microscopic polyangiitis. It is given by intravenous infusions in various doses depending on the diagnosis. Case reports and series demonstrated benefits for scleritis and orbital inflammatory diseases.81–83 Results from prospective randomized clinical trials for the treatment of refractory noninfectious scleritis (in review) and orbital inflammation (in press) show that rituximab therapy is effective to control inflammation in the majority of participants.
Some evidence suggests that rituximab may be effective for the treatment of BD-related conditions, in spite of the fact that it is conceptualized predominantly as a T-cell-driven disease. Sadreddini et al reported that one course of two rituximab infusions (1,000 mg, 2-week interval) was effective to control BD-related uveitis and retinal vasculitis, and control of inflammation was sustained at 18 months of follow-up.84 A subsequent prospective trial was conducted in 20 patients with refractory, active BD-related uveitis, retinal vasculitis, and edema. The subjects were randomized into two groups: the first received two doses of 1,000 mg rituximab (15-day interval), 15 mg methotrexate, and prednisone 0.5 mg/kg/day; the second group was given pulse cyclophosphamide (1,000 mg/month), azathioprine (2–3 mg/kg/day), and prednisone (0.5 mg/kg/day). The results showed that the rituximab group had more substantial improvement of the Total Adjusted Disease Activity Index, while ocular inflammation was significantly improved in both groups.85
Experience in treating refractory JIA uveitis was demonstrated in two retrospective case series (eight and ten patients).86,87 After two infusions at a 2-week interval, uveitis inactivity was typically observed 4–5 months after the first infusions,86 but approximately half of the patients may need a third infusion at 6–12 months due to uveitic flare.86,87 In the patients with oligoarthritis, their uveitis tended to respond to rituximab treatment better than those with polyarthritis, but the study population was too small to draw a definitive conclusion.87
Abatacept (T-lymphocyte inhibitor)
Abatacept (Orencia®, Bristol-Myers Squibb Company, New York, NY, USA) is a soluble fusion protein composed of a fragment of human immunoglobulin and the ligand-binding domain of cytotoxic T-lymphocyte-associated antigen-4. The fusion protein binds to an antigen presenting cell and blocks the activity of what is called an accessory molecule that activates the T-cell. Abatacept is approved for the treatment of RA and JIA. It is given by monthly intravenous infusions after initial loading at 0, 2, and 4 weeks in children with JIA, but may be used as weekly subcutaneous injections after a single intravenous loading in adults with RA. Several reports demonstrated its efficacy to control or improve refractory JIA-uveitis in children and young adults (range, 8–23 years old) with intravenous infusions.90–93 The patients were previously recalcitrant or intolerant to two or more biologics (eg, TNF-α inhibitors, daclizumab, and rituximab). To date, Zulian et al reported the largest series of seven patients. The results showed that uveitis was improved in all patients, but only one patient had complete remission over the 7–11-month follow-up period. One patient discontinued treatment due to oral mycosis and arthritic flare.91 A subsequent report with longer follow-up (19–23 months) showed that, of the six patients who maintained therapy, five remained in good control, but one had both arthritic and uveitic flares at 12 months after starting treatment.92 A single report and two small case series showed that abatacept may result in complete remission of uveitis and/or complete resolution of macular edema after several months of treatment.90,92,93 In patients with well-controlled uveitis under abatacept, the infusion intervals may be successfully increased to every 6–7 weeks without flares of ocular or articular conditions.92 Abatacept may adequately control uveitis, but not arthritis in some occasions.93 A randomized, Phase II controlled trial of abatacept for the treatment of noninfectious uveitis from our group is in progress. Preliminary results showed that abatacept was effective, at least partially, to control refractory uveitis in the first three patients enrolled thus far.94
Basiliximab (T-lymphocyte inhibitor)
Basiliximab (Simulect®, Novartis Pharmaceuticals Corporation, East Hanover, NJ, USA) is a chimeric monoclonal antibody (IgG1κ), specifically binding to and blocking the IL-2 receptor α-chain (IL-2Rα, also known as CD25 antigen) on the surface of activated T-lymphocytes. It is approved for the prophylaxis of acute renal transplant rejection. A randomized controlled pilot study of its use for high-risk penetrating keratoplasty showed that it has inferior efficacy in preventing graft reactions compared with cyclosporine.95 A clinical trial on the safety and efficacy of basiliximab as maintenance therapy for stable noninfectious uveitis was started in March 2008, but was terminated in November 2008, pending further studies in non-ophthalmic indications. There are no reports on the use for uveitis at present.
Specific receptor antagonists
Anakinra (Kineret®, Swedish Orphan Biovitrum AB [publ], Stockholm, Sweden) is a competitive IL-1 receptor antagonist which prevents the activation of IL-1-mediated immune response. It is approved for the treatment of RA and cryopyrin-associated periodic syndromes. The recommended dose for RA is 100 mg daily by subcutaneous injection, and dose adjustment is needed for renal insufficiency. An animal study showed that it may suppress experimental immune-mediated uveitis in mice.96 Clinical data on its use for uveitis are limited to a single case report of successful treatment in a 6-year-old boy with refractory chronic infantile neurological cutaneous articular syndrome-associated bilateral panuveitis. In this case, anakinra (1 mg/kg/day) enabled withdrawal of oral prednisone with remission of ocular inflammation.97 A clinical trial of anakinra for the treatment of BD is now recruiting participants.
Canakinumab (Ilaris®, Novartis Pharmaceuticals Corporation) is an IL-1β blocker indicated for systemic JIA and cryopyrin-associated periodic syndromes in adults and children 4 years of age or older. It is generally administered by subcutaneous injection every 4–8 weeks, but can also be given intravenously. Ugurlu et al described a case of a 16-year-old female with severe bilateral panuveitis with hypopyon and retinal vasculitis associated with BD. The patient was intolerant to IFN therapy and refractory to conventional immunosuppressive and several biologic agents, including infliximab, adalimumab, and anakinra. The inflammation resolved with improved visual acuity, which was sustained for at least 8 weeks after a single infusion of 150 mg canakinumab. However, there were no long-term outcomes presented.98
Simonini et al reported efficacy of canakinumab for the treatment of intractable uveitis with macular edema and retinal detachment in a 16-year-old male with a diagnosis of Blau syndrome (onset at 4 years of age), a nucleotide-binding oligomerization domain-containing protein 2-associated pediatric granulomatous uveitis and arthritis. The patient had inadequate response to conventional immunosuppression and biologics, including infliximab, adalimumab, and abatacept. Canakinumab was given 2 mg/kg/month with concurrent use of oral methotrexate and low-dose prednisone, and led to rapid quiescence of uveitis, which was sustained for at least 6 months of therapy. The treatment also resulted in normalization of most gene expression profiles that overlapped with the transcriptional signature of patients with systemic JIA. The authors postulated that canakinumab may be particularly useful for uveitis associated with this rare syndrome.99
Gevokizumab (XOMA 052, XOMA Corporation, Berkeley, CA, USA) is a humanized monoclonal antibody that binds to IL-1β. Phase III multicenter clinical trials for active noninfectious uveitis (EYEGUARD™-A), controlled non-infectious uveitis (EYEGUARD™-C), and BD-associated uveitis (EYEGUARD™-B) are underway. The medication is also currently being studied for scleritis, moderate to severe inflammatory acne, diabetes, and erosive osteoarthritis of the hand.
A 98-day pilot study that enrolled seven patients with active BD-related uveitis and retinal vasculitis resistant to azathioprine and/or cyclosporine showed that a single infusion of gevokizumab 0.3 mg/kg resulted in rapid improvement of uveitis in 1–4 days with complete resolution of retinal vasculitis in all patients (median 14 days), and sustained response was observed for 21–97 days (median 49 days). No treatment-related side effects were observed in this short-term study.100
Tocilizumab (Actemra®, Genentech, Inc.) is an anti-IL-6 receptor monoclonal antibody. It is approved for the treatment of RA, as well as polyarticular and systemic JIA. Recommended doses vary from 4 to 12 mg/kg intravenous infusion every 2–4 weeks, depending on underlying conditions and clinical response.
Tappeiner et al reported a successful suppression of uveitis with tocilizumab in two out of three patients with JIA-related uveitis refractory to adalimumab, etanercept, and/or abatacept. Uveitis inactivity was observed at 1 month and maintained at least 6 and 12 months of follow-up in the two patients. One patient had improvement of arthritis, but uveitis remained active.101 Described by Hirano et al, a 47-year-old woman with severe BD-related posterior uveitis resistant to immunosuppression and infliximab therapy experienced complete remission of posterior uveitis, genital ulcers, and erythema nodosum after switching to tocilizumab monotherapy.102 Not only controlling uveitis, tocilizumab infusions may also lead to regression of retinal exudation and macular edema associated with retinal vasoproliferative tumor, as reported in a 29-year-old female with chronic JIA-associated uveitis.103
The use of tocilizumab for a rare multicentric Castleman disease, relating an overproduction of IL-6 due to plasma cell hyperplasia, was demonstrated by Oshitari et al to treat a 58-year-old man with refractory uveitis, chronic fever, fatigue, and pulmonary infiltration. Resolution of uveitis and perivascular leakage on fluorescein angiogram was achieved at 3 months after treatment.104
CME is one of leading causes of decreased vision in patients with uveitis. Interestingly, one retrospective case series studied eight eyes of five patients with mildly active uveitis (three with BSCR, one with JIA, and one with idiopathic uveitis) and severe long-standing CME (mean 13.4 years of CME evolution) recalcitrant to immunosuppression, local corticosteroid injection, and at least one TNF-α inhibitor. Tocilizumab infusions led to significant improvement of macular thickness on optical coherence tomography (mean, from 602±236 to 295±95 microns, before and 6 months after treatment, respectively). Improvement in visual acuity was observed in 75% of eyes.105 Given these promising results, clinical trials on its use for uveitis and CME are warranted. A Phase I/II clinical trial on tocilizumab therapy for JIA-related uveitis, and a study on its safety, tolerability, and bioactivity for noninfectious intermediate, posterior, and panuveitis, are in progress.
Of note, tocilizumab was given at 8 mg/kg intravenously every 4 weeks for all aforementioned cases,101–103,105 except the patient with Castleman disease who received the same dose at 2-week intervals.104 Although tocilizumab therapy may improve systemic rheumatic symptoms, possible paradoxical inflammatory responses have been proposed, as observed in a 41-year-old male with HLA-B27-positive AS who developed his first episode of uveitis and a 65-year-old male with RA whose peripheral ulcerative keratitis occurred for the first time, after 2 and 11 months of tocilizumab therapy, respectively.106
Alemtuzumab (Campath®, Genzyme Corporation, Cambridge, MA, USA) is a CD52-directed cytolytic antibody indicated as a single agent for the treatment of B-cell chronic lymphocytic leukemia. It has also demonstrated benefit in other conditions such as RA and multiple sclerosis.107,108 In 1995, Isaacs et al described a case of a 36-year-old man who presented with severe panuveitis with choroiditis and retinal vasculitis resistant to immunosuppressive agents, including cyclophosphamide and intravenous immunoglobulin. The patient had significant systemic symptoms, presumably from chronic corticosteroid therapy. He was given intravenous alemtuzumab 12 mg daily for 5 days (at 45 years of age) with brief improvement of ocular inflammation. However, the patient subsequently died with myocardial infarction.109 In 2000, Dick et al reported a series of ten patients with various ocular inflammatory diseases treated with intravenous alemtuzumab 10–12 mg daily for 5 days. Of the ten patients, six had uveitis (four with retinal vasculitis, one with BD-related uveitis, and one with sympathetic ophthalmia). The first five patients had clinical improvement, but the latter with sympathetic ophthalmia had stable inflammation without deterioration.110
Indirect data on uveitis were also reported in a study of 18 patients with active BD treated with escalating doses of intravenous alemtuzumab at 4, 10, 40, 40, and 40 mg daily for 5 consecutive days (total 134 mg). Of the 18 patients, 12 had ocular manifestations, but only four had active uveitis at the time of alemtuzumab therapy. Of the four, two had complete remission and two had partial improvement at 6 months after treatment.111
Efalizumab (Raptiva®, Genentech, Inc.) is an anti-CD11a antibody. One case report showed that 37 weekly subcutaneous injections of efalizumab effectively treated recalcitrant uveitic CME, and the effect was durable 6 months after discontinuation of treatment.112 A subsequent prospective noncomparative Phase I/II trial using 16 weekly subcutaneous injections in six patients also showed its efficacy in improving uveitic CME.113 However, efalizumab was withdrawn from the market due to increasing risk of progressive multifocal leukoencephalopathy.114
IFN-α and -β are naturally occurring cytokines affecting the immune system. IFN-α2a, -α2b, and -β1a have been reported to be useful in the treatment of refractory ocular inflammation and associated CME, particularly in patients with BD115 and multiple sclerosis.116 A review article by Kötter et al analyzing 36 studies (between 1986 and 2002) on the use of IFN therapy for BD showed that 182 out of 338 patients (54%) were given IFN due to acute uveitis. Approximately 94% of the patients achieved partial or complete resolution of uveitis, generally within 2–4 weeks.117 Both IFN-α2a118 and -β1a116 have been shown to effectively treat uveitic CME in approximately 70% of patients. However, relapse is frequently seen after discontinuation of IFN treatment. To date, only IFN-α has been shown to control ocular inflammation with sustained remission even after discontinuation of therapy.119 IFN therapy may cause potentially serious complications. Multiple cases of possible IFN-induced sarcoidosis with120 or without121 uveitis have been reported. Therefore, we generally do not recommend IFN therapy for sarcoid-related uveitis.
Treatment of uveitis and its impact on quality of life (QOL)
It has been estimated that uveitis accounts for approximately 10% of visual disability in Western countries, and up to 35% of patients with uveitis have been reported to have significant visual impairment or legal blindness.122,123 However, visual acuity itself may not always reflect the quality of vision, as many patients may experience various degrees of decreased visual field, decreased contrast sensitivity, alteration of depth and color perception, increased light sensitivity, glares, and floaters. Compared with healthy subjects, patients with uveitis have significantly worse visual functioning and overall health status, leading to severely impaired QOL.124 Furthermore, patients with severe ocular inflammation commonly require systemic corticosteroid or immunosuppressive therapy, which may impact health-related QOL (HR-QOL) due to adverse drug reactions. As mentioned, uveitis more commonly affects the working population, whose onsets of symptoms typically occur earlier in life than those with age-related eye diseases such as cataracts, glaucoma, and age-related macular degeneration.2 Therefore, uveitis therapy is cumulatively associated with high social and economic burdens.125 The National Eye Institute Visual Function Questionnaire (NEI VFQ), and the simplified version, NEI VFQ-25, were developed to measure vision-specific QOL (VS-QOL) for visually impaired individuals. Schiffman et al applied the NEI VFQ-25 with the Medical Outcomes Study Short-Form 36 to measure HR-QOL in patients with uveitis.124 We recommend that both tools be used to assess VS-QOL and HR-QOL in patients with uveitis.126
When focusing mainly on biologic therapy for systemic conditions, the data from the JuMBO (Juvenile Arthritis MTX/Biologics Long-Term Observation), a prospective cohort study following adult JIA patients formerly included in the national JIA biologic registry, showed that etanercept therapy offered improved long-term outcomes and HR-QOL of patients with severe JIA.127
The influence of uveitis treatment may be even more prominent when the patients suffer from both vision-threatening and systemic manifestations. BD is one of the best examples that biologic therapy may have significant impact to improve QOL as simultaneously improving both systemic and visual conditions. Sakai et al studied 20 patients with BD and recurrent uveitis attack, and found that infliximab therapy significantly improved VS-QOL and HR-QOL in patients with BD-related uveitis.128 A similar observation was observed with the use of tocilizumab for the same condition, by improving physical health (physical functioning, role physical, body pain, and general health perceptions) and mental health (vitality, social functioning, and role emotion).102
Biologic therapy is generally more costly compared with conventional immunosuppression. However, an example of biologics, abatacept, is believed to be cost-effective for the treatment of RA.129 The cost-effectiveness of the use of biologics for uveitis is yet to be confirmed.
Future targets, limitations, and unknowns
Although biologics have great potential in the treatment of uveitis, the application of biologic therapy has been hampered by several factors. First, uveitis is relatively rare compared with immune-mediated diseases such as RA or psoriasis. As a consequence, recruitment is often promoted by combining various etiologies of uveitis together. However, it is likely that differences in pathogenesis also mean differences in therapeutic response. Just as gout and RA may respond to different treatments, a drug which is efficacious for BD might not succeed in treating VKH. Second, different forms of uveitis require different endpoints. Vitreous haze might be important in pars planitis, but it is not a valuable endpoint in BSCR. Trials which lump different subtypes of uveitis together are hampered by the use of endpoints that might not fit all diagnoses equally.
Many additional targets have been identified for biologic therapy in diseases other than uveitis. Examples of targets to inhibit include a molecule common to IL-12 and IL-23, IL-23 alone, IL-17 or its receptor, IL-15, IFN-α, and a variety of adhesion molecules. With the exception of the antibody to the peptide chain shared by IL-12 and IL-23 (ustekinumab) and the antibody to alpha-4 integrin (natalizumab), all of these molecules are in various stages of testing, and their potential use in treating uveitis is still unknown. Monoclonal antibody therapy is also evolving. For example, technology now exists to deliver isolated antibody light chains that might have a wide biodistribution in the eye after topical application.130 It is also possible to develop monoclonal antibodies that recognize two or more targets and thus might be more efficacious than an inhibitor of a single target. DARPins are ankyrin repeat proteins that resemble antibodies in that they can have antigen specificity.131 They are being studied in the treatment of retinal diseases.132
A major unanswered question is whether biologic therapies will be effective if delivered locally to the eye. The fluocinolone implant has demonstrated that local corticosteroid therapy in the eye can be extremely effective but it is also highly toxic. The development of new slow-release materials will undoubtedly further the attractiveness of local therapy. Intravitreal therapy has the potential to achieve efficacy while minimizing or eliminating systemic toxicity. Infliximab has been injected directly into the eye. While it reportedly has benefited in the treatment of BD-related uveitis,133 others have cautioned its use and warned about local toxicity.134 We need to learn a great deal more about the risk-benefit ratio of the local delivery of cytokines in the eye.
Biologics are potent medications that may benefit some, but not all, patients with noninfectious uveitis. They are very useful when conventional immunosuppressive therapy has failed or has been poorly tolerated, or to treat concomitant ophthalmic and systemic inflammation that might benefit from these medications, such as those with RA, JIA, AS, BD, and IBD. It has been shown that with proper monitoring, biologic therapy can significantly improve QOL in patients with uveitis, particularly those with concurrent systemic symptoms.
Given their cost as well as the limited long-term safety data, we do not routinely recommend biologics as first-line therapy for noninfectious uveitis in most patients. However, exceptional considerations for earlier use may be made for those with vision-threatening conditions, such as severe BD-related panuveitis with retinal vasculitis, especially when corticosteroid therapy is contraindicated and the onset of action from conventional immunosuppressive agents may lag behind.
Evidence suggests that etanercept may not be as effective for uveitis as infliximab and adalimumab. Some biologics are also believed to cause paradoxical inflammatory responses. Daclizumab and efalizumab may be effective for some uveitis subtypes, but their use became historical after removal from the US market. Other agents, such as golimumab, abatacept, canakinumab, gevokizumab, tocilizumab, and alemtuzumab, may have great future promise for the treatment of noninfectious uveitis.
Due to limited data from randomized clinical trials on biologic agents for uveitis, many studies are currently underway. Yet, a journey to discover the ideal medication that is universally and rapidly effective, well tolerated, affordable, and with durable efficacy is to be continued.
Sirichai Pasadhika has no conflicts of interest to disclose. James Rosenbaum has served as a consultant to Abbott, Amgen, Allergan, Elan, Genentech, Lux Biosciences, Novartis, Santen, Sanofi, Teva, UCB, and Xoma. He has received clinical trial support from Bristol Myers, Genentech, Lux Biosciences, Xoma, Eyegate, and Abbott. He has received research support from Therakine.
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