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Study of Ivacaftor in Cystic Fibrosis Subjects Aged 12 Years and Older With the G551D Mutation (STRIVE)

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ClinicalTrials.gov Identifier: NCT00909532
Recruitment Status : Completed
First Posted : May 28, 2009
Results First Posted : August 21, 2012
Last Update Posted : January 18, 2013
Sponsor:
Collaborator:
Cystic Fibrosis Foundation
Information provided by (Responsible Party):
Vertex Pharmaceuticals Incorporated

Study Description
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Brief Summary:
The purpose of this study was to evaluate the efficacy and safety of ivacaftor in subjects with cystic fibrosis aged 12 years and older who have the G551D mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. Ivacaftor is a potent and selective CFTR potentiator of wild-type, G551D, F508del, and R117H forms of human CFTR protein. Potentiators are pharmacological agents that increase the chloride ion transport properties of the channel in the presence of cyclic AMP-dependent protein kinase A (PKA) activation.

Condition or disease Intervention/treatment Phase
Cystic Fibrosis Drug: Ivacaftor Drug: Placebo Phase 3

Detailed Description:

This was a phase 3 study in subjects with cystic fibrosis (CF) age 12 years and older who have a G551D-CFTR mutation and percent predicted forced expiratory volumn in 1 second (FEV1) between 40% and 90%.

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 function of the CFTR protein, and the most prevalent mutation with a gating defect in CF is the G551D mutation.

This study was designed to further evaluate the efficacy of ivacaftor in subjects with CF who have a G551D-CFTR gene mutation and to evaluate safety in this population over a longer period than previously studied.

Study Design
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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 167 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Phase 3, Randomized, Double-Blind, Placebo-Controlled, Parallel Group Study to Evaluate the Efficacy and Safety of VX-770 in Subjects With Cystic Fibrosis and the G551D Mutation
Study Start Date : June 2009
Actual Primary Completion Date : July 2010
Actual Study Completion Date : November 2012

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Cystic Fibrosis
Drug Information available for: Ivacaftor

Arms and Interventions
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Arm Intervention/treatment
Placebo Comparator: Placebo
Subjects who received placebo every 12 hours (q12h) for up to 48 weeks.
 Drug: Placebo
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.
 Drug: Ivacaftor
150-mg tablets given orally q12h for up to 48 weeks
Other Name: VX-770


Outcome Measures
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Primary Outcome Measures :
  1. Absolute Mean 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.


Secondary Outcome Measures :
  1. Absolute Mean Change From Baseline in Percent Predicted 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.

  2. Absolute Change From Baseline in Cystic Fibrosis Questionnaire-Revised (CFQ-R) Score Through Week 24 and Week 48 (Respiratory Domain Score, Pooled) [ 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).

  3. 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.

  4. Time-to-first Pulmonary Exacerbation Through Week 24 and Week 48 [ Time Frame: baseline through 24 weeks and 48 weeks ]
    Pulmonary exacerbation was defined as a change in antibiotic therapy (intravenous, inhaled, or oral) for any 4 or more of signs/symptoms such as change in sputum; new or increased hemoptysis; increased cough or dyspnea; malaise, fatigue, or lethargy; temperature above 38 degrees C; anorexia or weight loss; sinus pain/tenderness and discharge; change in physical examination of the chest; decreased pulmonary function by 10%; and radiographic changes indicative of pulmonary infection.

  5. 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.


Eligibility Criteria
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Ages Eligible for Study:   12 Years and older   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Confirmed diagnosis of cystic fibrosis (CF) and G551D mutation in at least 1 allele
  • Forced expiratory volume in 1 second (FEV1) of 40% to 90% (inclusive) of predicted normal for age, gender, and height at Screening.
  • No clinically significant abnormalities that would have interfered with the study assessments, as judged by the investigator
  • Willing to use highly effective birth control methods during the study

Exclusion Criteria:

  • History of any illness or condition that might confound the results of the study or pose an additional risk in administering study drug to the subject
  • Acute respiratory infection, pulmonary exacerbation, or changes in therapy for pulmonary disease within 4 weeks of Day 1 of the study
  • History of alcohol, medication or illicit drug abuse within one year prior to Day 1
  • Abnormal liver function ≥ 3x the upper limit of normal
  • Abnormal renal function at Screening
  • History of solid organ or hematological transplantation
  • Pregnant, planning a pregnancy, breast-feeding, or unwilling to follow contraception requirements
  • Ongoing participation in another therapeutic clinical study or prior participation in an investigational drug study within 30 days prior to Screening
  • Use of inhaled hypertonic saline treatment
  • Concomitant use of any inhibitors or inducers of cytochrome P450 3A4 (CYP 3A4)
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00909532


Locations
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Sponsors and Collaborators
Vertex Pharmaceuticals Incorporated
Cystic Fibrosis Foundation
Investigators
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Principal Investigator: Bonnie W. Ramsey, MD Children's Hospital and Regional Medical Center, Seattle, Washington, USA
Principal Investigator: Stuart Elborn, MD Respiratory Medicine Group, Queen's University of Belfast, Belfast, Northern Ireland, UK
More Information
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Additional Information:

Publications:

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

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Responsible Party: Vertex Pharmaceuticals Incorporated
ClinicalTrials.gov Identifier: NCT00909532    
Other Study ID Numbers: VX08-770-102
First Posted: May 28, 2009    Key Record Dates
Results First Posted: August 21, 2012
Last Update Posted: January 18, 2013
Last Verified: January 2013
Keywords provided by Vertex Pharmaceuticals Incorporated:
Fibrosis
Pancreatic Diseases
Lung Diseases
Respiratory Tract Diseases
 Genetic Diseases, Inborn
Infant, Newborn, Diseases
Pathologic Processes
Additional relevant MeSH terms:
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Cystic Fibrosis
Fibrosis
Pathologic Processes
Pancreatic Diseases
Digestive System Diseases
Lung Diseases
Respiratory Tract Diseases
 Genetic Diseases, Inborn
Infant, Newborn, Diseases
Ivacaftor
Chloride Channel Agonists
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action