Thalidomide for systemic onset juvenile idiopathic arthritis

Treatment of systemic juvenile idiopathic arthritis

Systemic juvenile idiopathic arthritis (sJIA) is an inflammatory disease with hallmarks of severe systemic inflammation, which can be accompanied by arthritis. Contemporary scientific insights set this paediatric disorder on a continuum with its counterpart, adult-onset Still disease (AOSD). Patients with sJIA are prone to complications, including life-threatening hyperinflammation (macrophage activation syndrome (sJIA-MAS)) and sJIA-associated lung disease (sJIA-LD). Meanwhile, the treatment arsenal in sJIA has expanded markedly. State-of-the-art therapeutic approaches include biologic agents that target the IL-1 and IL-6 pathways. Beyond these, a range of novel agents are on the horizon, some of them already being used on a compassionate use basis, including JAK inhibitors and biologic agents that target IL-18, IFNγ, or IL-1β and IL-18 simultaneously. However, sJIA, sJIA-MAS and sJIA-LD still pose challenging conundrums to rheumatologists treating paediatric and adult patients worldwide. Although national and international consensus treatment plans exist for the treatment of 'classic' sJIA, the treatment approaches for early sJIA without arthritis, and for refractory or complicated sJIA, are not well defined. Therefore, in this Review we outline current approaches for the treatment of sJIA and provide an outlook on knowledge gaps.

Refractory systemic onset juvenile idiopathic arthritis: current challenges and future perspectives

Systemic juvenile idiopathic arthritis (SJIA) is a rare disease with distinct features not seen in other categories of juvenile idiopathic arthritis. In recent years, advances in the understanding of disease immunopathogenesis have led to improved targeted therapies with significant improvement in patient outcomes. Despite these advances, there remain subsets of SJIA with refractory disease and severe disease-associated complications. This review highlights existing options for treatment of refractory SJIA and explores potential future therapeutics for refractory disease.Key Points:Despite targeted Interleukin IL-1 and IL-6 inhibitors a subset of SJIA remains refractory to therapy. About 1 in 7 SJIA patients will be refractory to targeted IL-1 or IL-6 therapy.There is no current agreed upon definition for refractory SJIA and we propose in this review that refractory SJIA is presence of active systemic or arthritic features despite treatment with anti-IL-1 or anti-IL-6 therapy or disease requiring glucocorticoids for control beyond 6 months.SJIA disease associated complications include presence of associated macrophage activation syndrome (MAS), interstitial lung disease (ILD) or amyloidosis and management of each differs.Refractory SJIA treatment options currently include additional conventional synthetic disease modifying anti-rheumatic drugs (csDMARDS), biologic (bDMARDS), combination biologic therapy, targeted synthetic (tsDMARDS) or other immunomodulatory therapies.

Research progress in drug therapy of juvenile idiopathic arthritis

BACKGROUND

Juvenile idiopathic arthritis (JIA) is the most common chronic rheumatic disease in children. With the gradual expansion of the incidence of JIA in the population, the pathogenesis and treatment of JIA were further explored and analyzed, and JIA has achieved some success in drug therapy.

DATA SOURCES

A systemic literature search was conducted on PubMed, Cochrane Library, EMBASE, ISI Web of Science, the US National Institutes of Health Ongoing Trials Register, and the EU Clinical Trials Register. Through the searching of clinical trials of JIA in recent years, we summarized the progress of the clinical treatment of JIA.

RESULTS

The main treatment drugs for JIA include non-steroidal anti-inflammatory drugs, glucocorticoids, disease-modifying antirheumatic drugs and biological agents. So far, a variety of biological agents targeting the cytokines and receptors involved in its pathogenesis have been gradually approved for JIA in many countries. The application of biological agents in JIA showed good efficacy and safety, bringing unprecedented experience to children and adolescents with JIA.

CONCLUSIONS

The potential and advantages of biologic agents in the treatment of JIA are significant, and the application of biologic agents in the treatment of JIA will be more and more common.

Course, Outcome and Complications in Children with Systemic Onset Juvenile Idiopathic Arthritis

OBJECTIVES

To assess the course, outcome and complications in a mono-centric cohort of 53 patients with systemic onset juvenile idiopathic arthritis (s-JIA).

METHODS

In an observational study, 53 consecutive patients diagnosed with s-JIA on or before October 2009 were enrolled and followed up between October 2009 and September 2012. At each 6-12 weekly visit, clinical examination, laboratory investigations and details of on-going treatment were recorded. Disease course was classified as monocyclic, intermittent and persistent. At last visit, outcome was studied with respect to remission (Wallace criteria) and Steinbrocker functional classification. Juvenile Arthritis Damage Index (JADI) was measured on a subset.

RESULTS

In 53 patients analysed, the mean follow-up period was 5.5 ± 1.85 y, with a cumulative follow-up period of 291.5 patient-years. The mean age at diagnosis was 6.3 ± 3.4 y. Thirty-three patients suffered from disease and/or drug related complications. Infections were observed in 16 (30%) and macrophage activation syndrome in 5 (9.4%). Nine (17%) had a monocyclic course, 31 (58.5%) had an intermittent course and 13 (24.5%), a persistent course. At last visit, 9/9 patients of the monocyclic group, 17/31 in the intermittent group and 3/13 in the persistent group were in remission. At the end of the study, 96.2% of the index patients were Steinbrocker functional class I and II with the monocyclic group having the best functional outcome. JADI was performed on 20/53 patients. Nine had significant articular damage. The range of Juvenile arthritis damage index-articular (JADI-A) was 0-25/72 (median-6) and of Juvenile arthritis damage index-extra articular (JADI-EA) was 0-4/17 (median-1).

CONCLUSIONS

The outcome of patients with s-JIA in a resource limited setting where early diagnosis, multidisciplinary care and availability of biologics are hurdles, is further altered by complications related to longstanding disease and over use of steroids.