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Cystic FibrosisPhase 1NCT06154447

Evaluation of VX-828 in Healthy Participants and in Participants With Cystic Fibrosis

A Phase 1 study testing VX-828, Itraconazole and Midazolam in people with Cystic Fibrosis, run by Vertex Pharmaceuticals Incorporated at 12 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The purpose of the study is to evaluate safety, tolerability, and pharmacokinetics of VX-828 and VX-828 in triple combination (TC) with Tezacaftor (TEZ)/ VX-118 or TEZ/ deutivacaftor (D-IVA) in healthy participants and VX-828 in combination with D-IVA with or without TEZ in participants with cystic fibrosis (CF). Read more about this study

Who is it for?
Ages 18 years and olderHealthy volunteers can take part
Conditions the study is for
Cystic Fibrosis
What is being tested?
VX-828, Itraconazole and Midazolam
Type of treatment
Pill or oral medicine
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
165 participants
Where
12 sitesUnited States
Study dates
12 Dec 2023to 10 Jul 2026
Phase
Phase 1
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • Healthy volunteers accepted
  • Adult, Older adult

Who may be able to join

  • Parts A-D:
  • Participants between the ages of 18 and 55 years
  • Body mass index (BMI) of 18.0 to 32.0 kilogram per meter square (kg/m^2)
  • A total body weight of more than (>) 50 kg
  • Nonsmoker or ex-smoker for at least 3 months before screening with current nonsmoking status confirmed by urine or blood cotinine at screening
  • Cohort C2 only: Willing to provide a single DNA sample
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  • Part E:
  • Participants 18 years or older
  • Confirmed diagnosis of CF as determined by the investigator
  • A total body weight of more than or equal to (>=) 35 kg
  • Participants must be heterozygous for F508del with a second CFTR allele carrying a minimal function mutation that is not responsive to ELX/TEZ/IVA therapy
  • Participants must have a forced expiratory volume in 1 second (FEV1) of greater than or equal to (≥) 40% of predicted normal for age, sex, and height

Who cannot join

  • Parts A-D:
  • History of febrile illness or other acute illness within 14 days before the first dose of study drug
  • Any condition possibly affecting drug absorption
  • Part E:
  • An acute illness not related to CF (e.g., gastroenteritis) within 14 days before the first dose of study drug
  • History of solid organ or hematological transplantation
Show all 9Show fewer
  • History of clinically significant cirrhosis with or without portal hypertension
  • Lung infection with organisms associated with a more rapid decline in pulmonary status
  • Other protocol defined Inclusion/Exclusion criteria will apply.

Trial locations and contacts

12 sites in 1 country.

12 sites in 1 country

United States12 sites
  • Billings Clinic, Pediatric Pulmonary Dept.

    Billings, Montana, 59101

  • Boston Children's Hospital

    Boston, Massachusetts, 02115

  • Vermont Lung Center

    Colchester, Vermont, 05446

  • Cook Children's Pulmonology

    Fort Worth, Texas, 76104

  • New York Medical College

    Hawthorne, New York, 10532

  • Joe DiMaggio Cycstic Fibrosis & Pulmonary Center

    Hollywood, Florida, 33021

  • Kentucky Children's Hospital

    Lexington, Kentucky, 40508

  • University of Minnesota -Pulmonology

    Minneapolis, Minnesota, 55455

  • AdventHealth Medical Group Pulmonology at Orlando Ridgewood

    Orlando, Florida, 32803

  • Altasciences Clinical Kansas

    Overland Park, Kansas, 66212

  • University of Utah Hospital - Pulmonology

    Salt Lake City, Utah, 84132

  • ProMedica Toledo Children's Hospital & ProMedica Central Physicians, LLC

    Toledo, Ohio, 43606

Other trials in United States

About this study

Official title: A Phase 1, Study of VX-828 in Healthy Subjects and in Subjects With Cystic Fibrosis

The purpose of the study is to evaluate safety, tolerability, and pharmacokinetics of VX-828 and VX-828 in triple combination (TC) with Tezacaftor (TEZ)/ VX-118 or TEZ/ deutivacaftor (D-IVA) in healthy participants and VX-828 in combination with D-IVA with or without TEZ in participants with cystic fibrosis (CF).

Read the detailed description

This clinical trial information was submitted voluntarily under the applicable law and, therefore, certain submission deadlines may not apply. (That is, clinical trial information for this applicable clinical trial was submitted under section 402(j)(4)(A) of the Public Health Service Act and 42 CFR 11.60 and is not subject to the deadlines established by sections 402(j)(2) and (3) of the Public Health Service Act or 42 CFR 11.24 and 11.44.).

Conditions
Cystic Fibrosis
Being tested
VX-828, Placebo, Itraconazole, Midazolam, Tezacaftor
Medical subject headings
Cystic Fibrosis

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • VX-828Drug

    Suspension for Oral Administration

  • PlaceboDrug

    Suspension for Oral Administration

  • ItraconazoleDrug

    Solution for Oral Administration

  • MidazolamDrug

    Syrup for Oral Administration

  • TezacaftorDrug

    Also called TEZ, VX-661

    Tablets for Oral Administration

  • VX-118Drug

    Tablets for Oral Administration

  • PlaceboDrug

    Suspension and Tablets for Oral Administration

  • DeutivacaftorDrug

    Also called D-IVA, VX-561

    Tablets for Oral Administration

  • VX-828Drug

    Tablets for Oral Administration

Study groups in NCT06154447
Study groupRoleWhat they receive
Part A: Single Ascending Dose (SAD)ExperimentalParticipants will be randomized to receive a single dose of different dose levels of VX-828.
Receives: Drug: VX-828
Part A: PlaceboPlacebo comparatorParticipants will be randomized to receive placebo matched to VX-828.
Receives: Drug: Placebo
Part B: Multiple Ascending Dose (MAD)ExperimentalParticipants will be randomized to receive multiple doses of different dose levels of VX-828. The dose levels will be determined based on the data from Part A.
Receives: Drug: VX-828
Part B: PlaceboPlacebo comparatorParticipants will be randomized to receive placebo matched to VX-828.
Receives: Drug: Placebo
Part C: Drug Drug InteractionExperimentalParticipants will receive a single dose of VX-828, followed by a washout period, Itraconazole administration, and concomitant administration of itraconazole and VX-828; or participants will receive Midazolam followed by VX-828/TEZ/D-IVA administration, and concomitant administration of VX-828/TEZ/D-IVA and Midazolam. Part C will be an open-label optional cohort.
Receives: Drug: VX-828; Drug: Itraconazole; Drug: Midazolam; Drug: Tezacaftor; Drug: Deutivacaftor
Part D: VX-828 in combination with TEZ/VX-118 ,TEZ/D-IVA or D-IVAExperimentalParticipants will be randomized to receive VX-828 in combination with TEZ/VX-118, TEZ/D-IVA, or D-IVA.
Receives: Drug: VX-828; Drug: Tezacaftor; Drug: VX-118; Drug: Deutivacaftor
Part D: PlaceboPlacebo comparatorParticipants will be randomized to receive placebo matched to VX-828/TEZ/VX-118 or placebo matched to VX-828 in combination with TEZ/D-IVA or D-IVA
Receives: Drug: Tezacaftor; Drug: Placebo; Drug: Deutivacaftor
Part E: VX-828 in Combination with D-IVA with or without TEZ in CFExperimentalParticipants with cystic fibrosis will receive VX-828 in combination with D-IVA with or without TEZ.
Receives: Drug: Tezacaftor; Drug: Deutivacaftor; Drug: VX-828

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Part A: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Measured: From Signing of Informed Consent Form (ICF) up to Safety Follow Up (Up to Day 67)

  2. Part B: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Measured: From Signing of Informed Consent Form (ICF) up to Safety Follow Up (Up to Day 80)

  3. Part D: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Measured: From Signing of Informed Consent Form (ICF) up to Safety Follow Up (Up to Day 80)

  4. Part E: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Measured: From Signing of Informed Consent Form (ICF) up to End of Study (Up to Day 111)

  5. Part C: Maximum Observed Concentration (Cmax) of VX-828 in Plasma in the Absence and Presence of Itraconazole

    Measured: From Day 1 up to Day 71

  6. Part C: Area Under the Concentration Versus Time Curve (AUC) of VX-828 in Plasma in the Absence and Presence of Itraconazole

    Measured: From Day 1 up to Day 71

  7. Part C: Maximum Observed Concentration (Cmax) of Midazolam in Plasma in the Absence and Presence of VX-828/TEZ/D-IVA

    Measured: From Day 1 up to Day 30

  8. Part C: Area Under the Concentration Versus Time Curve (AUC) of Midazolam in Plasma in the Absence and Presence of VX-828/TEZ/D-IVA

    Measured: From Day 1 up to Day 30

Secondary outcomes (11)
  1. Part A: Maximum Observed Concentration (Cmax) of VX-828 in Plasma

    Measured: From Day 1 up to Day 67

  2. Part A: Area Under the Concentration Versus Time Curve (AUC) of VX-828 in Plasma

    Measured: From Day 1 up to Day 67

  3. Part B: Maximum Observed Concentration (Cmax) of VX-828 at Day 28 in Plasma

    Measured: From Day 1 up to Day 80

  4. Part B: Area Under the Concentration Versus Time Curve (AUC) of VX-828 at Day 28 in Plasma

    Measured: From Day 1 up to Day 80

  5. Part C: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Measured: From Signing of Informed Consent Form (ICF) up to Safety Follow Up (Up to Day 82)

  6. Part D: Maximum Observed Concentration (Cmax) of VX-828, TEZ and D-IVA and their Metabolites at Day 28 in Plasma

    Measured: Day 28

  7. Part D: Area Under the Concentration Versus Time Curve (AUC) of VX-828, TEZ and D-IVA and their Metabolites at Day 28 in Plasma

    Measured: Day 28

  8. Part E: Maximum Observed Concentration (Cmax) of VX-828, TEZ, and D-IVA and their Metabolites in Plasma

    Measured: Day 1 and Day 28

  9. Part E: Area Under the Concentration Versus Time Curve (AUC) of VX-828, TEZ, and D-IVA and their Metabolites in Plasma

    Measured: Day 28

  10. Part E: Pre-dose Plasma Concentration (Ctrough) of VX-828, TEZ, D-IVA and its Metabolites

    Measured: Pre-dose at Day 4, Day 8, Day 15, Day 22, Day 35, Day 49, Day 63, Day 80

  11. Part E: Absolute Change in Sweat Chloride

    Measured: From Baseline and At Day 28

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted4 Dec 2023
  2. Study start12 Dec 2023
  3. Primary completion10 Jul 2026
  4. Study completion10 Jul 2026

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Sequential
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
165 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06154447
Sponsor's protocol ID
VX23-828-001
Status last verified
Aug 2026
First submitted
23 Nov 2023
Last updated
10 Aug 2026
Results posted
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No: Details on Vertex data sharing criteria and process for requesting access can be found at: https://www.vrtx.com/our-science/clinical-trials-data-sharing/

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing VX-828, Itraconazole and Midazolam in people with Cystic Fibrosis, run by Vertex Pharmaceuticals Incorporated at 12 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 12 inclusion and 9 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 10 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 12 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Part A: Safety and Tolerability as Assessed by Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs) (time frame: From Signing of Informed Consent Form (ICF) up to Safety Follow Up (Up to Day 67)). The study lists 8 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 10 Aug 2026.

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