['To assess the efficacy of statins in the treatment of asthma.', 'Electronic databases were searched to identify randomized controlled trials that measured the efficacy of statins in the treatment of asthma, and a meta-analysis of the pooled data was performed.', 'Five trials were identified; four met the inclusion criteria (total number of patients 200). Compared with controls, patients in the statin groups had higher forced expiratory volume in 1 s (FEV1) values before inhaled corticosteroids (0.09 l, 95% confidence interval [CI] -0.06, 0.23), higher FEV1 values after inhaled corticosteroids (0.06 l, 95% CI -0.09, 0.22), and higher morning peak expiratory flow rates (9.87 l, 95% CI -15.66, 35.40). These results were not statistically significant and, furthermore, publication bias was detected.'] Does statin therapy improve lung function in asthma : a meta-analysis of randomized controlled trials?