Association Corticosteroid/Azathioprine in Microscopic Polyangiitis/ Polyarteritis Nodosa or Eosinophilic Granulomatosis With Polyangiitis (Churg Strauss Syndrome)

Study Overview
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Brief Summary
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To determine whether a combination of corticosteroids and azathioprine can achieve a higher remission rate and a lower subsequent relapse rate in patients with newly-diagnosed microscopic polyangiitis, polyarteritis nodosa or eosinophilic granulomatosis with polyangiitis (Churg Strauss syndrome) with no poor prognosis factor (FFS=0), and without significantly increasing the rate of adverse events, as compared to corticosteroids alone. The study hypothesis is a reduction of the absolute risk of treatment failure or relapse within the first 24 months following initiation of therapy of least 25%.

Detailed Description
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Patients with new diagnosis of 1) microscopic polyangiitis, polyarteritis nodosa or eosinophilic granulomatosis with polyangiitis (Churg Strauss syndrome) and 2) without any factor of poor prognosis according to the French five factors score (FFS - including creatininemia >140µmol/l, proteinuria >1 g/24 h, specific gastro-intestinal involvement, specific cardiomyopathy, and CNS involvement) can be included at diagnosis or within the first 15 days following initiation of corticosteroids. Treatment is randomly assigned, centrally, and received in a double-blinded fashion. It consists in a combination of azathioprine (2 mg/kg/day) and corticosteroids (starting at 1 mg/kg/day for 3 weeks then progressively tapered over a mean of 50 weeks, varying according to patient's weight) or, for the control group, the same corticosteroid therapy plus placebo. Duration of azathioprine or placebo is 12 months, and patients are followed for 12 additional months, yielding in a total duration of the protocol of 24 months after entry for each patient. End point is the number of patients who achieve sustained remission and who do not suffer a relapse during the 24 months of the study protocol. Based on the results of the early CHUSPAN trial for similar patients treated with corticosteroids alone, the cumulative rate of failures and relapses can be estimated at 40% at 24 months. The primary hypothesis of the CHUSPAN 2 is a reduction by at least 25% for the rate of this combined parameter of remission-treatment failure and relapse at 24 months. Based on this hypothesis, using a bilateral test, with a significance level of 5%, a beta level of 80% and an estimated 5% of lost-of-follow-up, 104 patients must be included. Secondary end points include the initial remission rate (independently of subsequent relapses), rate of adverse events and their severity according to the WHO toxicity grading system, number of deaths, number of patients who could not be weaned of corticosteroids, area under the curve for corticosteroids, and different scales, such as BVAS (activity of the disease), VDI (damage), HAQ, SF36, ADL and the evaluation of the need for health care facilities.

Official Title
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Evaluation of a New Treatment Strategy for Patients With Microscopic Polyangiitis, Polyarteritis Nodosa or Eosinophilic Granulomatosis With Polyangiitis (Churg Strauss Syndrome) Without Poor Prognosis Factors

Conditions
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MPA, PAN or EGPA With FFS=0, At Diagnosis or Within the First 15 Days Following Initiation of Corticosteroids

Intervention / Treatment
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* Drug: corticosteroid and azathioprine
* Drug: corticosteroid and placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: male or female patients aged over 18 years new diagnosis of microscopic polyangiitis, polyarteritis nodosa or eosinophilic granulomatosis with polyangiitis (Churg Strauss syndrome), satisfying ACR 1990 and/or Chapel Hill Nomenclature criteria (positive biopsy is not mandatory providing those criteria are fulfilled) with no factor of poor prognosis according to the French five factors score (FFS=0) at diagnosis or within the first 21 days following initiation of corticosteroids signed information and consent form patients covered by Health Insurance having had a baseline physical examination Exclusion Criteria: patients with microscopic polyangiitis, polyarteritis nodosa or eosinophilic granulomatosis with polyangiitis (Churg Strauss syndrome) with one or more factor(s) of poor prognosis according to the French five factors score (FFS ≥ 1) patients with polyarteritis nodosa with ANCA, not satisfying the criteria for microscopic polyangiitis patients with clinically overt alveolar hemorrhage or respiratory distress syndrome patient treated with corticosteroids for more than 15 days or already receiving another immunosuppressant relapsing vasculitis other vasculitis, especially secondary vasculitides vasculitis secondary or associated with a viral infection, such as hepatitis B or C virus, or HIV malignancy pregnancy and breast feeding,women of child-bearing age not willing or with contra-indication to receive contraception contra-indication to any of the study agents need to continue allopurinol for those patients taking allopurinol consent deny or inability to receive information and give consent participation in another concomitant therapeutic trial no affiliation to any of the general French health care system

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 1<br>Drug: corticosteroid and azathioprine | Drug: corticosteroid and azathioprine<br>* Corticosteroid 1 mg/kg/day with a conventional decrease dose Azathioprine : 2 mg/kg/day during one year in 2 to 3 times a day by oral route<br>|
| Placebo Comparator: 2<br>Drug: corticosteroid and placebo | Drug: corticosteroid and placebo<br>* Corticosteroid 1 mg/kg/day with a conventional decrease dose Placebo : 2 mg/kg/day during one year in 2 to 3 times a day by oral route<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| combined rate of remission-treatment failures and minor or major relapses at 24 months |  | 24 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| initial remission rate (independently of subsequent relapse) |  | 24 months | 
| number of patients who have a minor or major relapse |  | 24 months | 
| number of serious treatment-related adverse effects |  | 24 months | 
| number of patients with at least one treatment-related adverse effect |  | 24 months | 
| severity of treatment-related effects according to the WHO toxicity grading system (grades 1 to 4; grades 3 and 4 for the severity) |  | 24 months | 
| number of deaths and causes |  | 24 months | 
| number of patients who could not be weaned of corticosteroids and dose required |  | 24 months | 
| area under the curve for corticosteroids |  | 24 months | 
| different scales, such as BVAS (activity of the disease), VDI (damage), HAQ, SF36, ADL and the evaluation of the need for health care facilities. |  | 24 months | 
| number of flares with or without asthma and/or eosinophilia (only for EGPA analysis) |  | 24 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Vasculitis, Polyarteritis nodosa (PAN), Microscopic polyangiitis (MPA), Eosinophilic granulomatosis with polyangiitis (EGPA), Churg Strauss syndrome (CSS), Azathioprine