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Meta-Analysis
. 2012 Aug 15;2012(8):CD003643.
doi: 10.1002/14651858.CD003643.pub4.

Immunosuppressant and immunomodulatory treatment for dermatomyositis and polymyositis

Affiliations
Meta-Analysis

Immunosuppressant and immunomodulatory treatment for dermatomyositis and polymyositis

Patrick A Gordon et al. Cochrane Database Syst Rev. .

Abstract

Background: Idiopathic inflammatory myopathies are chronic diseases with significant mortality and morbidity. Whilst immunosuppressive and immunomodulatory therapies are frequently used, the optimal therapeutic regimen remains unclear. This is an update of a review first published in 2005.

Objectives: To assess the effects of immunosuppressants and immunomodulatory treatments for dermatomyositis and polymyositis.

Search methods: We searched the Cochrane Neuromuscular Disease Group Specialized Register (August 2011), the Cochrane Central Register of Controlled Trials (CENTRAL) (Issue 3 2011), MEDLINE (January 1966 to August 2011), EMBASE (January 1980 to August 2011) and clinicaltrials.gov (August 2011). We checked the bibliographies of identified trials and wrote to disease experts.

Selection criteria: We included all randomised controlled trials (RCTs) or quasi-RCTs involving participants with probable or definite dermatomyositis and polymyositis as defined by the criteria of Bohan and Peter, or definite, probable or mild/early by the criteria of Dalakas. In participants without a classical rash of dermatomyositis, inclusion body myositis should have been excluded by muscle biopsy. We considered any immunosuppressant or immunomodulatory treatment. The two primary outcomes were the change in a function or disability scale measured as the proportion of participants improving one grade, two grades etc, predefined based on the scales used in the studies after at least six months, and a 15% or greater improvement in muscle strength compared with baseline after at least six months. Other outcomes were: the International Myositis Assessment and Clinical Studies Group (IMACS) definition of improvement, number of relapses and time to relapse, remission and time-to-remission, cumulative corticosteroid dose and serious adverse effects.

Data collection and analysis: Two authors independently selected papers, extracted data and assessed risk of bias in included studies. They collected adverse event data from the included studies.

Main results: The review authors identified fourteen 14 relevant RCTs. They excluded four trials.The 10 included studies, four of which have been added in this update, included a total of 258 participants. Six studies compared an immunosuppressant or immunomodulator with placebo control, and four studies compared two immunosuppressant regimes with each other. Most of the studies were small (the largest had 62 participants) and many of the reports contained insufficient information to assess risk of bias.Amongst the six studies comparing immunosuppressant with placebo, one study, investigating intravenous immunoglobulin (IVIg), showed statistically significant improvement in scores of muscle strength in the IVIg group over three months. Another study investigating etanercept showed some evidence of a steroid sparing effect, a secondary outcome in this review, but no improvement in other assessed outcomes. The other four randomised placebo-controlled trials assessed either plasma exchange and leukapheresis, eculizumab, infliximab or azathioprine against placebo and all produced negative results.Three of the four studies comparing two immunosuppressant regimes (azathioprine with methotrexate, ciclosporin with methotrexate, and intramuscular methotrexate with oral methotrexate plus azathioprine) showed no statistically significant difference in efficacy between the treatment regimes. The fourth study comparing pulsed oral dexamethasone with daily oral prednisolone and found that the dexamethasone regime had a shorter median time to relapse but fewer side effects.Immunosuppressants were associated with significant side effects.

Authors' conclusions: This systematic review highlights the lack of high quality RCTs that assess the efficacy and toxicity of immunosuppressants in inflammatory myositis.

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Conflict of interest statement

Professor Ernest Choy has received research grants, and served as member of advisory boards and speaker bureaus of Abbott Laboratories, Allergan, AstraZeneca, Boehringer Ingelheim, Chelsea Therapeutics, Chugai Pharma, Eli Lilly, Ferring Pharmacuetical, GSK, Jazz Pharmaceuticals, MedImmune, Merrimack Pharmaceutical, MSD, Pfizer, Pierre Fabre Medicament, Roche, Schering Plough, Synovate, UCB Celltech and Wyeth.

Dr Patrick Gordon's institution has received grants for three of the studies in this review. One was an excluded study (Chung 2007), funded by various non‐commercial grant‐giving bodies and two are ongoing studies, one funded by Bristol Myers Squibb and the Myositis Support Group (NCT01315938) and the other by the Arthritis Research Campaign (SELAM, ISRCTN40085050). Dr John Winer is a collaborator in the SELAM trial. Bristol Myers Squibb funded Dr Gordon's attendance at EULAR 2011 and 2012 (money paid to institution).

Dr Jessica Hoogendijk is co‐author of a RCT in this review (Van de Vlekkert 2010). She has no other known conflicts of interest.

Dr John Winer's institution undertook an audit of IVIg side effects and received payment for travel and equipment from CSL Behring. He has been involved in an, as yet, unpublished trial of methotrexate and azathioprine for polymyositis and dermatomyositis (Miller 2002).

Figures

1
1
Methodological quality summary: review authors' judgments about each methodological quality item for each included study.
1.1
1.1. Analysis
Comparison 1 IVIg versus placebo, Outcome 1 Improvement in manual muscle strength by ≧15% at 12 weeks.
2.1
2.1. Analysis
Comparison 2 Azathioprine versus placebo, Outcome 1 Improvement in muscle strength.
3.1
3.1. Analysis
Comparison 3 Plasma exchange or leukapheresis versus placebo, Outcome 1 Number of patients who improved after treatment.
4.1
4.1. Analysis
Comparison 4 Infliximab versus placebo, Outcome 1 Improvement in manual muscle strength by ≧15% at 16 weeks.
4.2
4.2. Analysis
Comparison 4 Infliximab versus placebo, Outcome 2 Improved by IMACS criteria at 16 weeks.
5.1
5.1. Analysis
Comparison 5 Ciclosporin versus methotrexate, Outcome 1 Improvement in 'Muscle endurance with functional test' measurement at 6 months (maximum score 56).
5.2
5.2. Analysis
Comparison 5 Ciclosporin versus methotrexate, Outcome 2 Improvement in 'Clinical Assessment' score at 6 months (maximum score 33).
5.3
5.3. Analysis
Comparison 5 Ciclosporin versus methotrexate, Outcome 3 Improvement in global patient's assessment at 6 months (0 to 10).
6.1
6.1. Analysis
Comparison 6 Oral methotrexate with azathioprine versus intravenous methotrexate with leucovorin rescue, Outcome 1 Improvement as defined by 'combined evaluation of strength and function' tool.
7.1
7.1. Analysis
Comparison 7 Etanercept versus placebo, Outcome 1 Mean change in Health Assessment Questionnaire score at 52 weeks.
7.2
7.2. Analysis
Comparison 7 Etanercept versus placebo, Outcome 2 Mean change in Health Assessment Questionnaire score at 24 weeks.
7.3
7.3. Analysis
Comparison 7 Etanercept versus placebo, Outcome 3 Achieving the International Myositis Assessment and Clinical Studies Group (IMACS) definitions of improvement at 24 weeks.
7.4
7.4. Analysis
Comparison 7 Etanercept versus placebo, Outcome 4 Achieving the International Myositis Assessment and Clinical Studies Group (IMACS) definitions of improvement at 52 weeks.
7.5
7.5. Analysis
Comparison 7 Etanercept versus placebo, Outcome 5 Cumulative dosage of prednisone over the one‐year study period  .
7.6
7.6. Analysis
Comparison 7 Etanercept versus placebo, Outcome 6 Average change in time (sec) to walk 30 feet comparing performance at baseline to week 52.
7.7
7.7. Analysis
Comparison 7 Etanercept versus placebo, Outcome 7 Average change in time to rise from a chair from baseline to week 52  .
7.8
7.8. Analysis
Comparison 7 Etanercept versus placebo, Outcome 8 Treatment failure.
7.9
7.9. Analysis
Comparison 7 Etanercept versus placebo, Outcome 9 Individualized Neuromuscular Quality of Life.
7.10
7.10. Analysis
Comparison 7 Etanercept versus placebo, Outcome 10 SF‐36 Physical Component Summary Score.
8.1
8.1. Analysis
Comparison 8 Pulse oral dexamethasone versus daily oral prednisolone, Outcome 1 Neuromuscular Symptom Score.
8.2
8.2. Analysis
Comparison 8 Pulse oral dexamethasone versus daily oral prednisolone, Outcome 2 Remission.
8.3
8.3. Analysis
Comparison 8 Pulse oral dexamethasone versus daily oral prednisolone, Outcome 3 Relapse.

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References

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