Efficacy and Safety of Benralizumab in EGPA Compared to Mepolizumab.

Inclusion Criteria

• •1. Male or female subjects age 18 years or older.
• •2. EGPA diagnosis based on history or presence asthma and eosinophilia (\>1.0x10\^9/L and/or \>10% of leucocytes) and at least 2 of; biopsy with eosinophilic vasculitis or perivascular/granulomatous inflammation; mono-or polyneuropathy, non-fixed pulmonary infiltrates, sino-nasal abnormality; cardiomyopathy; glomerulonephritis; alveolar haemorrhage; palpable purpura; anti neutrophil cytoplasmic anti-body (ANCA) positivity (Myeloperoxidase or proteinease 3).
• •3. History of relapsing (at least 1 confirmed EGPA relapse within last 2 years and \> 12 weeks prior to screening), or refractory (failure to attain remission, defined as BVAS=0 and oral corticosteroid (OCS) dose \<=7.5 mg/day of prednisolone or equivalent, following standard induction regimen for at least 3 months and within 6 months prior to screening, or recurrence of symptoms upon OCS tapering at any dose of ≥7.5 mg/day prednisolone or equivalent.
• •If induction with glucocorticoidsalone, patient must have failed to attain remission after 3 months and the glucocorticoid dose must be ≥15 mg/day prednisolone or equivalent for the 4 weeks prior to randomization.
• •4. Must be on a stable dose of oral prednisolone or prednisone of ≥7.5 mg/day (but not \>50mg/day) for at least 4 weeks prior to randomization.
• •5. If receiving immunosuppressive therapy (excluding cyclophosphamide) the dose must be stable for the 4 weeks prior to randomization and during the study (dose reductions for safety reasons will be permitted).
• •6. QTc(F)\<450 msec or QTc(F)\<480 msec for patients with bundle branch block.
• •7. Females of childbearing potential must use an acceptable method of birth control from randomization for at least 12 weeks after the last study drug administration.