Inhaled corticosteroids have been the mainstay of treatment for persistent asthma for decades. A new trial suggests that for the ~50% of asthma patients with low sputum eosinophils, inhaled steroids are no better than placebo, and neither was tiotropium.
Treatment with the inhaled glucocorticoid mometasone or the long-acting muscarinic antagonist tiotropium resulted in similar outcomes among the majority of patients with mild asthma who had low (less than 2%) sputum eosinophil levels. Results from the SIENA trial were published in the New England Journal of Medicine and presented at a society conference.