J Tamaoki, M Kondo, N Sakai, J Nakata, H Takemura, A Nagai, T Takizawa and K Konno
First Department of Medicine, Tokyo Women's Medical College, Japan.

To test whether the leukotriene antagonist ONO-1078 (pranlukast) prevents asthma exacerbations during reduction of high-dose inhaled corticosteroid, we conducted a randomized, double-blind, placebo- controlled study in 79 asthma patients requiring high doses (1,500 microg/d or more) of inhaled beclomethasone dipropionate (BDI) for clinical control (duration of asthma, 11.0 +/- 3.1 yr; duration of BDI treatment, 0.5 +/- 0.3 yr; FEV1 percentage of predicted, 80.7 +/- 2.0%). After a 2-wk run-in period, the doses of BDI were halved, while the patients were assigned to receive orally ONO-1078, 450 mg twice daily, or placebo. In the placebo group FEV1 decreased by 0.33 +/- 0.20 L after 6 wk (p < 0.001). Likewise, morning and evening PEF decreased by 46 +/- 7 L/min and 18 +/- 6 L/min, respectively. By contrast these variables were sustained above baseline in the ONO-1078 group. The number of daytime and nighttime asthma symptoms and the use of beta2- agonist increased in the placebo group, whereas they remained unchanged in the ONO-1078 group. In the placebo group concentrations of serum eosinophil cationic protein and exhaled nitric oxide increased (p = 0.007 and p = 0.025, respectively), compared with no change in the ONO- 1078 group. Therefore, the leukotriene antagonist ONO-1078 prevents the asthma deterioration provoked by a 6-wk reduction of the dose of inhaled BDI into half.

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