title: A proof of concept study to evaluate putative benefits of montelukast in moderate persistent asthmatics.
abstract: OBJECTIVE
  Whether chronic dosing with montelukast confers benefit in patients with moderate to severe asthma remains to be fully established. A proof of concept study was performed evaluating putative benefits with montelukast in moderate persistent asthmatics who were taken off inhaled corticosteroids (ICS) and switched to salmeterol. The latter was done to dissociate the effects of montelukast from ICS.
  
  
  METHODS
  Twenty moderate to severe persistent asthmatics completed a randomized double-blind crossover study. Subjects received montelukast 10 mg daily or placebo for 2 weeks each. This was preceded by a 2-week run-in when ICS were discontinued and salmeterol started, and used on a regular basis throughout the study. Measurements were made after run-in and after both randomized treatments.
  
  
  RESULTS
  There were no significant sequence effects for responses as to whether placebo or montelukast were given first or second. Methacholine PD20 values after run-in, first and second placebo were 63 micro g, 60 micro g and 64 micro g, respectively (corresponding to 2, 4 and 6 weeks of ICS washout, respectively). Lung function deteriorated pre vs post run-in, which was significant (P < 0.05) for FEF25-75 % predicted. Montelukast conferred significant (P < 0.05) improvements as change from post run-in compared with placebo in methacholine PD20, FEV1 % predicted, FEF25-75 % predicted, diurnal peak expiratory flow, symptoms and salbutamol use. For the primary outcome of methacholine PD20, this amounted to a 1.6-fold difference (95% CI 1.1, 2.5).
  
  
  CONCLUSIONS
  In moderate persistent asthmatics switched from taking ICS to salmeterol alone, adding montelukast conferred significant benefits on all parameters of asthma control. Further studies are indicated to evaluate whether montelukast exhibits additive effects to ICS/long-acting beta2-adrenoceptor agonist combination inhalers upon clinically important outcomes.
authors.affiliation: Asthma & Allergy Research Group, Ninewells Hospital & Medical School, University of Dundee, Dundee DD1 9SY, Scotland, UK.
authors.forename: Graeme P
authors.initials: GP
authors.lastname: Currie
authors.forename: Daniel K C
authors.initials: DK
authors.lastname: Lee
authors.forename: Owen J
authors.initials: OJ
authors.lastname: Dempsey
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Fowler
authors.forename: Louise M
authors.initials: LM
authors.lastname: Cowan
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Lipworth
mesh_terms: D000085:Acetates / Q000627:therapeutic use*; D000293:Adolescent; D000328:Adult; D018927:Anti-Asthmatic Agents / Q000627:therapeutic use*; D001249:Asthma / Q000188:drug therapy*; D002908:Chronic Disease; D003521:Cyclopropanes; D004311:Double-Blind Method; D004341:Drug Evaluation; D005260:Female; D005541:Forced Expiratory Volume / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D010366:Peak Expiratory Flow Rate / Q000187:drug effects; D011804:Quinolines / Q000627:therapeutic use*; D013440:Sulfides; D016896:Treatment Outcome
chemical_list: D000085:Acetates; D018927:Anti-Asthmatic Agents; D003521:Cyclopropanes; D011804:Quinolines; D013440:Sulfides; C093875:montelukast