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CompletedNCT04135495Updated Nov 22, 2022

A Phase 2 Study to Evaluate the Safety, Tolerability, PK and PD of ELX-02 in Cystic Fibrosis Patients With G542X Allele

A Phase 2 interventional study of ELX-02 and Ivacaftor in Cystic Fibrosis, sponsored by Eloxx Pharmaceuticals, Inc.. Completed at 10 sites in 2 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2022-11-22.

Sponsored by Eloxx Pharmaceuticals, Inc. · Phase 2, Interventional, and Treatment

From the registry’s dates

  • Primary completion was Oct 2022, 4 years 1 month ago, and no results have been posted to the registry.
Phase
Phase 2
Study type
Interventional
Enrollment
17
Allocation
Not applicable
Ages
18 Years and older
Sex
All
01

Study summary

This is a Phase 2 open-label, dose-escalation study to evaluate the safety, tolerability, PK, and PD of multiple dose levels of SC administered ELX-02 with and without ivacaftor in patients with CF with at least one G542X allele.

In total, up to 16 patients will be enrolled in the trial; up to 4 patients will be homozygotes for G542X, and the remaining patients will be compound heterozygotes with one G542X or phenotypically similar nonsense allele and any Class 1 or Class 2 mutation.

Each patient will receive up to 5 escalating doses as follows:

  • ELX-02 0.3 mg/kg per day SC
  • ELX-02 0.75 mg/kg per day SC
  • ELX-02 1.5 mg/kg per day SC
  • An individualized dose of ELX-02, as high as 3.0 mg/kg per day SC, based on the patients observed safety and tolerability, PK at previous doses and the results of laboratory tests.
  • ELX-02 1.5 mg/kg per day SC plus 150 mg ivacaftor every 12 bid
02

Conditions studied

  • Cystic Fibrosis

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Keywords

  • cystic fibrosis
  • ELX-02
  • G542X allele
  • eukaryotic ribosomal selective glycoside
03

In context

Cystic Fibrosis

1,619 studies on the registry are indexed under Cystic Fibrosis; 199 are open to participants now.

This study's enrollment of 17 is below the median of 36 across 1,051 interventional studies indexed under Cystic Fibrosis.

Browse Cystic Fibrosis studies →

Lead sponsor

Eloxx Pharmaceuticals, Inc. is the lead sponsor of 9 studies on the registry; 1 is open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. Males and females age 18 years and above
  2. A confirmed diagnosis of nmCF with a documented G542X mutation, homozygote, or compound heterozygote with one of the specified mutations. For heterozygotes, one mutation has to be G542X or phenotypically similar nonsense allele, and the second mutation has to be any Class 1 or Class 2 mutation. Patients with one G542X allele or phenotypically similar nonsense allele and a second allele that is not a Class 1 or Class 2 mutation may be potentially allowed but only after discussion on a case by case basis with and written approval from the Sponsor.
  3. Documented SCC ≥60 mEq
  4. ≥40% predicted normal for age, gender and height at Screening (Knudson Equation)
  5. (BMI) of 19.0 to 30.0 kg/m2 (inclusive). Patients with a lower BMI may be entered into the study at the discretion of the investigator following consultation with the Sponsor.

Exclusion criteria

Exclusion Criteria:

  1. Participation in clinical study including administration of any drug or device in the last 30 days or 5 half-lives (whichever is longer) prior to investigational product dosing in the current study
  2. History of any organ transplantation
  3. Major surgery within 180 days (6 months) of Screening
  4. Patients without documented prior aminoglycoside exposure who have a mitochondrial mutation that has been shown to increase sensitivity to aminoglycosides
  5. Known allergy to any aminoglycoside
  6. Patients with any abnormality at ENT screening, that indicates the presence of a vestibular toxicity associated with prior exposure to aminoglycosides.
  7. Dizziness Handicap Inventory (DHI)-H score at screening must be >16.
  8. Patients receiving CFTR modulators within 2 months of study treatment
Terms in these criteria, in plain language(3)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

FEV1

From a breathing test (spirometry): how much air you can blow out in the first second. Often given as a percentage of what is expected for your age, height and sex.

BMI (body mass index)

Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.

What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.

Investigational drug or device

A drug or device being studied in a clinical trial.

It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.

05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
17 participants (actual)

Study arms

  • Experimental
    ELX-02

    Eukaryotic ribosomal selective glycoside (ERSG)

    Drug: ELX-02 · Drug: Ivacaftor

Interventions

  • DrugELX-02

    ELX-02 is a small molecule, new chemical entity being developed for the treatment of genetic diseases caused by nonsense mutations. ELX-02 is a eukaroyotic ribosomal selective glycoside (ERSG)

  • CFTR potentiator

06

What researchers measure

Primary outcomes

  1. AEs associated with different dose levels of ELX-02

    Time frame: From the time of first dosing through the follow-up visit, an average of approximately 9 weeks

  2. Area under the plasma concentration curve from time zero to 24 hours (AUC0-24h)

    Full PK profile 8 blood samples over 24 hours

    Time frame: Day 1 of treatment periods 1, 2, 3, and 4

  3. Maximum observed plasma concentration (Cmax) on Day 1

    Full PK profile 8 blood samples over 24 hours

    Time frame: Day 1 of treatment periods 1, 2, 3, and 4

  4. Peak observed plasma concentration (Cpeak) over time

    Time frame: Days 1, 2, and 7 of treatment periods 1-3; Days 1, 2, 7, and 14 of treatment period 4, sparse blood sampling at 30 min and 1 hour post dose

  5. Trough observed plasma concentration (Cpredose) over time

    Time frame: Days 1, 2 and 7 of treatment periods 1-3, Days 1, 2, 7 and 14 of treatment period 4, sparse sampling at pre-dose

Secondary outcomes

  1. Changes from baseline in sweat chloride concentration

    Time frame: From baseline to Day 7 of treatment periods 1-3, and Days 7 and 14 of treatment period 4

  2. Changes from baseline in percent predicted forced expiratory volume (ppFEV1)

    Time frame: From baseline to Day 7 of treatment periods 1-3, and Days 7 and 14 of treatment period 4

  3. Changes from baseline in percent predicted forced vital capacity (ppFVC)

    Time frame: From baseline to Day 7 of treatment periods 1-3, and Days 7 and 14 of treatment period 4

  4. Changes from baseline in percent predicted forced expiratory flow at 25-75% (ppFEF25-75)

    Time frame: From baseline to Day 7 of treatment periods 1-3, and Days 7 and 14 of treatment period 4

07

Study locations

10 sites
  • Long Beach Memorial
    Long Beach, California 90806, United States
  • Stanford School of Medicine
    Palo Alto, California 94305, United States
  • National Jewish Health
    Denver, Colorado 80206, United States
  • Johns Hopkins
    Baltimore, Maryland 21287, United States
  • Boston Children's Hospital
    Boston, Massachusetts 02451, United States
  • Nationwide Children's Hospital
    Columbus, Ohio 43205, United States
  • Baylor College of Medicine
    Houston, Texas 77030, United States
  • Foothills Hospital Calgary (University of Calgary)
    Calgary, Alberta T2N 4N1, Canada
  • St. Michael's Hospital
    Toronto, Ontario M5B-1W8, Canada
  • The University of Montreal Health Centre
    Montreal, Quebec H2X0A9, Canada
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Nov 22, 2022, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT04135495
Lead sponsor
Eloxx Pharmaceuticals, Inc.
Responsible party
Sponsor
First posted
Oct 22, 2019
Start date
Nov 25, 2019
Primary completion
Oct 3, 2022
Completion
Oct 3, 2022
Last update
Nov 22, 2022

Oversight

FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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Studies of the drug tested here: ELX-02

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