Expired Study
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Charlottesville, Virginia


Cystic Fibrosis (CF) is caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. The encoded protein, CFTR, is an epithelial chloride ion channel responsible for aiding in the regulation of salt and water absorption and secretion in various tissues. Although the disease affects multiple organs, the leading cause of mortality is the progressive loss of lung function. Obstruction of airways with thick mucous, chronic bacterial infection of the airways, and inflammatory response are all thought to play a role in causing lung damage. Through its function as a chloride channel, CFTR is believed to be integral in epithelial ion and water transport and hence, maintaining the normal hydration of lung secretions. VX-770 is a potent and selective potentiator of wild-type, G551D, F508del, and R117H forms of human CFTR. Based on in vitro studies and pharmacologic, pharmacokinetic (PK), and safety profiles, VX-770 has been selected for clinical development as a possible treatment for patients with CF. Hyperpolarized noble gas magnetic resonance imaging (HG-MRI) is a promising new means of assessing lung function by direct imaging of certain non-radioactive isotopes of an inert noble gas, such as helium or xenon. Through this technique, high-resolution 3-dimensional images of lung ventilation can be obtained in both pediatric and adult patients during a single short breath-hold following inhalation of the gas. This is a 2-part study to evaluate the effect of VX-770 on hyperpolarized 3He-MRI, and to evaluate the safety and efficacy of VX-770 in subjects aged 12 years and older with CF who have the G551D-CFTR mutation. Part A is a single-blind, placebo-controlled study that includes 4 weeks of VX-770 treatment and 4 weeks of placebo treatment. Part B is an open-label, 48 week study of long-term effect of VX 770 on hyperpolarized 3He-MRI.


Inclusion Criteria: - Male or female with Cystic Fibrosis - Must have the G551D-CFTR mutation on at least 1 allele - FEV1 ≥40% of predicted normal for age, gender, and height at Screening - 12 years of age or older - Must be able to swallow tablets Exclusion Criteria: - History of solid organ or hematological transplantation - Ongoing participation in another therapeutic clinical study or prior participation in an investigational drug study within the 30 days prior to screening - Use of inhaled hypertonic saline treatment within 14 days prior to the Screening Visit - Extensive body tattoos or other physical features that will confound MRI



Primary Contact:

Principal Investigator
Talissa Altes, MD
University of Virginia

Backup Contact:


Location Contact:

Charlottesville, Virginia
United States

There is no listed contact information for this specific location.

Site Status: N/A

Data Source: ClinicalTrials.gov

Date Processed: August 31, 2019

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