title: Testing two different doses of tiotropium Respimat® in cystic fibrosis: phase 2 randomized trial results.
abstract: BACKGROUND
  Tiotropium is a once-daily, long-acting anticholinergic bronchodilator with the potential to alleviate airway obstruction in cystic fibrosis. Our objective was to evaluate the efficacy and safety of 2.5 and 5 µg once-daily tiotropium delivered via the Respimat Soft Mist Inhaler vs. placebo in people with cystic fibrosis.
  
  
  METHODS
  This phase 2, 12-week, randomized, double-blind, placebo-controlled parallel-group study of tiotropium Respimat as add-on to usual cystic fibrosis maintenance therapy included people with cystic fibrosis with pre-bronchodilator forced expiratory volume in 1 second (FEV1) ≥ 25% predicted. Co-primary efficacy end points were change from baseline in percent-predicted FEV1 area under the curve from 0 to 4 hours (FEV1 AUC0-4h), and trough FEV1 at the end of week 12.
  
  
  RESULTS
  A total of 510 subjects with cystic fibrosis aged 5-69 years were randomized. Both doses of tiotropium resulted in significant improvement compared with placebo in the co-primary efficacy end points at the end of week 12 (change from baseline in percent-predicted FEV1 AUC0-4h: 2.5 µg: 2.94%, 95% confidence interval 1.19-4.70, p = 0.001; 5 µg: 3.39%, 95% confidence interval 1.67-5.12, p = 0.0001; in percent-predicted trough FEV1 ∶ 2.5 µg: 2.24%, p = 0.2; 5 µg: 2.22%, p = 0.02). There was a greater benefit with tiotropium 5 vs. 2.5 µg. No treatment-related adverse events or unexpected safety findings were observed in patients taking tiotropium.
  
  
  CONCLUSIONS
  Tiotropium significantly improved lung function in people with cystic fibrosis. The improvement was greater with the higher dose than the lower dose, with no difference in adverse events.
  
  
  BACKGROUND
  ClinicalTrials.gov NCT00737100 EudraCT 2008-001156-43.
authors.affiliation: Institute of Nursing and Health Research, University of Ulster, Ulster, Northern Ireland.
authors.forename: Judy M
authors.initials: JM
authors.lastname: Bradley
authors.affiliation: Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut, United States of America.
authors.forename: Paul
authors.initials: P
authors.lastname: Koker
authors.affiliation: Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut, United States of America.
authors.forename: Qiqi
authors.initials: Q
authors.lastname: Deng
authors.affiliation: Boehringer Ingelheim Pharma GmbH & Co KG, Ingelheim, Germany.
authors.forename: Petra
authors.initials: P
authors.lastname: Moroni-Zentgraf
authors.affiliation: The Hospital for Sick Children, Toronto, Ontario, Canada.
authors.forename: Felix
authors.initials: F
authors.lastname: Ratjen
authors.affiliation: Florida State University College of Medicine, Orlando, Florida, United States of America.
authors.forename: David E
authors.initials: DE
authors.lastname: Geller
authors.affiliation: Centre for Infection and Immunity, Queen's University Belfast, Belfast, Northern Ireland.
authors.forename: J Stuart
authors.initials: JS
authors.lastname: Elborn
mesh_terms: D000280:Administration, Inhalation; D000293:Adolescent; D000328:Adult; D002648:Child; D003550:Cystic Fibrosis / Q000188:drug therapy*; D004311:Double-Blind Method; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D012129:Respiratory Function Tests; D012602:Scopolamine Derivatives / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D000069447:Tiotropium Bromide; D055815:Young Adult
chemical_list: D012602:Scopolamine Derivatives; D000069447:Tiotropium Bromide