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for people ages 12 years and up
at San Francisco, California and other locations
study started
estimated completion:
Principal Investigator



This is a Phase 2, randomized, double-blind, placebo- and active-controlled, parallel group, multicenter study to evaluate the safety, tolerability, and efficacy of VX-440 in dual and triple combination with tezacaftor (TEZ; VX-661) and ivacaftor (IVA; VX-770) in subjects with cystic fibrosis (CF) who are homozygous for the F508del mutation of the CF transmembrane conductance regulator (CFTR) gene (F508del/F508del), or who are heterozygous for the F508del mutation and a minimal function (MF) CFTR mutation not likely to respond to TEZ and/or IVA therapy (F508del/MF).

Official Title

A Phase 2, Randomized, Double-blind, Controlled Study to Evaluate the Safety and Efficacy of VX-440 Combination Therapy in Subjects Aged 12 Years and Older With Cystic Fibrosis


Cystic Fibrosis


You can join if…

Open to people ages 12 years and up

  • Willing and able to comply with scheduled visits, treatment plan, study restrictions,laboratory tests, contraceptive guidelines, and other study procedures.
  • To prevent pregnancy, female participants of childbearing potential and their male partners will be required to use pre-specified, highly effective methods of non-hormonal contraception. Male participants with female partners of childbearing potential will be required to use a condom.
  • Body weight ≥35 kg.
  • Sweat chloride value ≥60 mmol/L from test results obtained during screening.
  • Subjects must have an eligible CFTR genotype:
  • Heterozygous for F508del and a minimal function (MF) mutation known or predicted not to be responsive to TEZ and/or IVA.
  • Homozygous for F508del
  • Subjects must have an FEV1 ≥40% and ≤90% of predicted normal for age, sex, and height at the Screening Visit
  • Stable CF disease as judged by the investigator.
  • Willing to remain on a stable CF medication regimen through the planned end of treatment or, if applicable, the Safety Follow up Visit.

You CAN'T join if...

  • History of any comorbidity that, in the opinion of the investigator, might confound the results of the study or pose an additional risk in administering study drug to the subject.
  • History of cirrhosis with portal hypertension.
  • Risk factors for Torsade de Pointes
  • History of hemolysis.
  • Glucose-6-phosphate dehydrogenase (G6PD) deficiency assessed at Screening.
  • Clinically significant abnormal laboratory values at screening
  • An acute upper or lower respiratory infection, pulmonary exacerbation, or changes in therapy for pulmonary disease within 28 days before the first dose of study drug.
  • Lung infection with organisms associated with a more rapid decline in pulmonary status
  • An acute illness not related to CF within 14 days before the first dose of study drug
  • A standard digital ECG demonstrating QTc>450 msec at screening.
  • History of solid organ or hematological transplantation.
  • History or evidence of cataract or lens opacity determined to be clinically significant by the ophthalmologist or optometrist based on the ophthalmologic examination during the Screening Period.
  • History of alcohol or drug abuse in the past year, including but not limited to,cannabis, cocaine, and opiates, as deemed by the investigator.
  • Ongoing or prior participation in an investigational drug study, with certain exceptions. (e.g., ongoing participation in NCT02565914)
  • Use of commercially available CFTR modulator (e.g., Kalydeco, Orkambi) within 14 days before screening (applies only to the Heterozygous F508del/MF cohorts; does not apply to the Homozygous F508del/F508del Cohort).
  • Pregnant or nursing females: Females of childbearing potential must have a negative pregnancy test at screening and Day 1.


  • Stanford University accepting new patients
    Palo Alto, California, United States


accepting new patients
Start Date
Completion Date
Vertex Pharmaceuticals Incorporated
Phase 2
Lead Scientist
Ngoc Ly
Study Type
Last Updated
March 1, 2017
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