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Double-blind, placebo-controlled study of cyclosporin A as a corticosteroid-sparing agent in corticosteroid-dependent asthma

, : Double-blind, placebo-controlled study of cyclosporin A as a corticosteroid-sparing agent in corticosteroid-dependent asthma. American Journal of Respiratory and Critical Care Medicine 153(2): 509-514

Patients with severe asthma who require long-term oral corticosteroid therapy are at risk of unwanted effects. Several immunosuppressive drugs have been assessed as corticosteroid-sparing agents in chronic asthma. We previously showed that cyclosporin A (CsA) administered for 12 wk improved lung function in corticosteroid-dependent patients. We have now investigated the corticosteroid-sparing properties of CsA over a 36-wk period. Following a 4-wk run-in period, 39 corticosteroid-dependent asthmatic patients were randomized to receive CsA (19 patients, initial doses 5 mg/kg/d) or matched placebo (20 patients) for 36 wk. Attempts were then made by a physician ignorant of the trial therapy to reduce their prednisolone dosages at 14-d intervals, provided that a patient's asthma remained stable or improved. Three patients receiving CsA had to be withdrawn from the study before they completed 12 wk of therapy. The remaining 16 patients achieved a statistically significant reduction in median daily prednisolone dosage of 62% (10 to 3.5 mg), compared with a decrease of 25% (10 to 7.5 mg) in the patients taking placebo (p = 0.043). This reduction was most pronounced during the last 12 wk of active therapy. In addition, morning peak expiratory flow rate (PEFR) improved significantly (mean 9.4%, SEM 3.0%) in the active-treatment group but not in the placebo group (p = 0.026 between groups). Predictable changes in renal function and blood pressure, and an increased incidence of hypertrichosis and paresthesia, were observed in the patients treated with CsA, but these did not necessitate withdrawal from the study, and were reversed during a 4-wk run-out period. Thus, low-dose CsA therapy, as compared with placebo, allowed a significant reduction in oral corticosteroid dosages in patients with severe asthma, and also improved lung function.


PMID: 8564089

DOI: 10.1164/ajrccm.153.2.8564089

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