Study of Ivacaftor in Cystic Fibrosis Subjects Aged 6 to 11 Years With the G551D Mutation (ENVISION)
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||A Phase 3, 2-Part, Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Study to Evaluate the Pharmacokinetics, Efficacy and Safety of VX-770 in Subjects Aged 6 to 11 Years With Cystic Fibrosis and the G551D Mutation|
- Absolute Change From Baseline in Percent Predicted Forced Expiratory Volume in 1 Second (FEV1) Through Week 24 [ Time Frame: baseline through 24 weeks ]Spirometry (as measured by FEV1) is a standardized assessment to evaluate lung function that is the most widely used endpoint in cystic fibrosis studies.
- Absolute Change From Baseline in Percent Predicted Forced Expiratory Volume in 1 Second (FEV1) Through Week 48 [ Time Frame: baseline through 48 weeks ]Spirometry (as measured by FEV1) is a standardized assessment to evaluate lung function that is the most widely used endpoint in cystic fibrosis studies.
- Absolute Change From Baseline in Cystic Fibrosis Questionnaire-Revised (CFQ-R) Through Week 24 and Week 48 (Respiratory Domain Score, Children) [ Time Frame: baseline through 24 weeks and 48 weeks ]The CFQ-R is a health-related quality of life measure for subjects with cystic fibrosis. Each domain is scored from 0 (worst) to 100 (best). A difference of at least 4 points in the respiratory domain score of the CFQ-R is considered a minimal clinically important difference (MCID).
- Absolute Change From Baseline in Sweat Chloride Concentration Through Week 24 and Week 48 [ Time Frame: baseline through 24 weeks and 48 weeks ]The sweat chloride (quantitative pilocarpine iontophoresis) test is a standard diagnostic tool for cystic fibrosis (CF), serving as an indicator of cystic fibrosis transmembrane conductance regulator (CFTR) activity.
- Absolute Change From Baseline in Weight at Week 24 and Week 48 [ Time Frame: baseline to 24 weeks and 48 weeks ]As malnutrition is common in patients with cystic fibrosis (CF) because of increased energy expenditures due to lung disease and fat malabsorption, body weight is an important clinical measure of nutritional status.
|Study Start Date:||August 2009|
|Study Completion Date:||April 2011|
|Primary Completion Date:||November 2010 (Final data collection date for primary outcome measure)|
Placebo Comparator: Placebo
Subjects who received placebo every 12 hours (q12h) for up to 48 weeks.
Tablet given orally q12h for up to 48 weeks
Experimental: 150 mg Ivacaftor q12h
Subjects who received 150 mg of ivacaftor q12h for up to 48 weeks.
150-mg tablet given orally q12h for up to 48 weeks
Other Name: VX-770
This is a Phase 3, 2-part, randomized, double-blind, placebo-controlled, parallel group multicenter study of orally administered ivacaftor in subjects with cystic fibrosis (CF) 6 to 11 years of age who have the G551D-CFTR mutation and a forced expiratory volume in 1 second (FEV1) between 90% and 105% predicted (using Knudson standards).
Based on in vitro studies and pharmacologic, pharmacokinetic (PK), and safety profiles, ivacaftor was selected for clinical development as a possible treatment for patients with CF. Patients with the G551D mutation were the targeted population for this study because ivacaftor is a potentiator of the gating effect of the CFTR protein, and the most prevalent mutation with a gating defect in CF is the G551D mutation.
This study was conducted in 2 parts. Part A was conducted to analyze the PK properties of ivacaftor and to determine the most appropriate dose to administer to subjects in Part B of this study. Part B explored the safety and efficacy of ivacaftor over long-term treatment in subjects 6 to 11 years of age.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00909727
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|Principal Investigator:||Richard Ahrens, MD||Roy A. & Lucille A. Carver College of Medicine|