The clinical effectiveness and cost-effectiveness of abatacept, adalimumab, etanercept and tocilizumab for treating juvenile idiopathic arthritis: a systematic review and economic evaluation

Abstract

BackgroundJuvenile idiopathic arthritis (JIA) is characterised by joint pain, swelling and a limitation of movement caused by inflammation. Subsequent joint damage can lead to disability and growth restriction. Treatment commonly includes disease-modifying antirheumatic drugs (DMARDs), such as methotrexate. Clinical practice now favours newer drugs termed biologic DMARDs where indicated.ObjectiveTo assess the clinical effectiveness and cost-effectiveness of four biologic DMARDs [etanercept (Enbrel®, Pfizer), abatacept (Orencia®, Bristol-Myers Squibb), adalimumab (Humira®, AbbVie) and tocilizumab (RoActemra®, Roche) – with or without methotrexate where indicated] for the treatment of JIA (systemic or oligoarticular JIA are excluded).Data sourcesElectronic bibliographic databases including MEDLINE, EMBASE, The Cochrane Library and the Database of Abstracts of Reviews of Effects were searched for published studies from inception to May 2015 for English-language articles. Bibliographies of related papers, systematic reviews and company submissions were screened and experts were contacted to identify additional evidence.Review methodsSystematic reviews of clinical effectiveness, health-related quality of life and cost-effectiveness were undertaken in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. A cost–utility decision-analytic model was developed to compare the estimated cost-effectiveness of biologic DMARDs versus methotrexate. The base-case time horizon was 30 years and the model took a NHS perspective, with costs and benefits discounted at 3.5%.ResultsFour placebo-controlled randomised controlled trials (RCTs) met the inclusion criteria for the clinical effectiveness review (one RCT evaluating each biologic DMARD). Only one RCT included UK participants. Participants had to achieve an American College of Rheumatology Pediatric (ACR Pedi)-30 response to open-label lead-in treatment in order to be randomised. An exploratory adjusted indirect comparison suggests that the four biologic DMARDs are similar, with fewer disease flares and greater proportions of ACR Pedi-50 and -70 responses among participants randomised to continued biologic DMARDs. However, confidence intervals were wide, the number of trials was low and there was clinical heterogeneity between trials. Open-label extensions of the trials showed that, generally, ACR responses remained constant or even increased after the double-blind phase. The proportions of adverse events and serious adverse events were generally similar between the treatment and placebo groups. Four economic evaluations of biologic DMARDs for patients with JIA were identified but all had limitations. Two quality-of-life studies were included, one of which informed the cost–utility model. The incremental cost-effectiveness ratios (ICERs) for adalimumab, etanercept and tocilizumab versus methotrexate were £38,127, £32,526 and £38,656 per quality-adjusted life year (QALY), respectively. The ICER for abatacept versus methotrexate as a second-line biologic was £39,536 per QALY.LimitationsThe model does not incorporate the natural history of JIA in terms of long-term disease progression, as the current evidence is limited. There are no head-to-head trials of biologic DMARDs, and clinical evidence for specific JIA subtypes is limited.ConclusionsBiologic DMARDs are superior to placebo (with methotrexate where permitted) in children with (predominantly) polyarticular course JIA who have had an insufficient response to previous treatment. Randomised comparisons of biologic DMARDs with long-term efficacy and safety follow-up are needed to establish comparative effectiveness. RCTs for JIA subtypes for which evidence is lacking are also required.Study registrationThis study is registered as PROSPERO CRD42015016459.FundingThe National Institute for Health Research Health Technology Assessment programme.

Immunosuppressive Activity of Abatacept on Circulating T Helper Lymphocytes from Juvenile Idiopathic Arthritis Patients

“…Collectively, our data confirm that abatacept is useful in ameliorating JIA in subjects with an inadequate response to other DMARDs, including biologics [24,25]. Moreover, we provided evidence that abatacept impaired some Th functions, such as the in vitro proliferative response to recall antigens, and the ability to produce cytokines.…”

Changing biological disease modifying treatment for paediatric uveitis in the real world

“…When DMARDs are unable to control disease progression, biological treatments are introduced, Adalimumab, an anti‐TNF‐α agent, is the preferred biological to manage JIA‐U and paediatric uveitis. The high cost of biological therapies is an important factor to consider; however, an extensive systematic review has inferred the cost‐effectiveness of biologics in improving vision, disease control and quality of life of JIA‐U patients …”

Etanercept or adalimumab: which is a better biological therapy for juvenile idiopathic arthritis?

“…Two reviews3 4 and one meta-analysis5 attempt quantitative comparison of the drugs via these trials, but none show a statistically significant difference. One of the reviews4 also conducted a cost-effectiveness analysis, deeming EDA slightly more cost-effective.…”