Clinical trial NCT04069260: A Phase 2 Study of ELX-02 in Patients With Nephropathic Cystinosis
Official title: A Phase 2, Single Center, Open-Label, Multiple Dose Escalation Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Daily Subcutaneously Administered ELX-02 in Patients With Nephropathic Cystinosis Bearing One or More CTNS Gene (Cystinosin) Nonsense Mutations
Study type: INTERVENTIONAL
Overall status: TERMINATED
Phase: PHASE2
Conditions: Genetic Disease
Nonsense Mutation
Cystinosis
Keywords: aminoglycoside
translational read-through
cystinosis
nonsense mutation
Lead sponsor: Eloxx Pharmaceuticals, Inc.
Sponsor class: INDUSTRY
First posted: 2019-08-28
Enrollment: 3
Sex: ALL
Minimum age (years): 12
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: This is a Phase 2 open label study to evaluate the safety, tolerability, PK, and PD of multiple dose levels of SC administered ELX-02 in patients with cystinosis with nonsense mutation in at least one allele.

Six patients will be enrolled in the trial.

The study will comprise of the following periods for each patient:

* A screening period of up to 6 weeks
* A total treatment period of 4 weeks
* A safety follow-up period of 4 weeks after the last treatment

Each patient will receive three escalating doses as follows:

* Treatment period 1: ELX-02 0.5 mg/kg SC daily for 7 days (total dose not to exceed 3.5 mg/kg for this week; the daily dose will be individualized to achieve the target weekly exposure of about 47.5 µg\*h/mL)
* Treatment period 2: ELX-02 1.0 mg/kg SC daily for 7 days (total dose not to exceed 7.0 mg/kg for this week; the daily dose will be individualized to achieve the target weekly exposure of about 95 µg\*h/mL)
* Treatment period 3: ELX-02 2.0 mg/kg SC daily for 14 days (total dose not to exceed 14 mg/kg for these two weeks; the daily dose will be individualized to achieve the target weekly exposure of about 190 µg\*h/mL)


Eligibility criteria: Patients must meet all of the following criteria to participate in this study:

1. Male or female patients who, at the time of screening, are 18 years of age or older (Cohort 1) or ≥12 years of age (Cohort 2)
2. A diagnosis of nephropathic cystinosis and biallelic CTNS mutations, including at least one nonsense mutation
3. Patients should have a mild to moderate disease estimated glomerular filtration rate ≥40 mL/min/1.73m2 using the Chronic Kidney Disease Epidemiology Collaboration CKD-EPI formula
4. Body mass index of 19.0 to 30.0 kg/m2. Patients with a lower BMI may be entered into the study at the discretion of the Investigator following consultation with the Sponsor
5. Renal transplant permitted with stable graft function (serum creatinine) for 3 months prior to Screening

Patients with any of the following characteristics/conditions will not be included in the study:

1. Participation in clinical study including administration of any investigational 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. Concomitant use of cysteamine bitartrate from 7 days prior to baseline until 7 days following final administration ELX-02
3. An average systolic blood pressure and/or diastolic blood pressure ≥95th percentile for sex, age, and height on 3 or more occasions during the screening period
4. Patients without documented prior aminoglycoside exposure who have a mitochondrial mutation that has been shown to increase sensitivity to aminoglycosides
5. Known relevant allergy or hypersensitivity to aminoglycosides

Primary outcomes:
measure: AEs associated with different dose levels of ELX-02
timeFrame: From the time of first dosing through the follow-up visit, an average of approximately 10 weeks
measure: Area under the plasma concentration curve from time zero to 24 hours (AUC0-24h)
timeFrame: Day 1 of treatment periods 1, 2, and 3
measure: Maximum observed plasma concentration (Cmax)
timeFrame: Day 1 of treatment periods 1, 2, and 3
measure: Observed plasma concentration at 1 hour post dose (C1h)
timeFrame: Days 1, 2, 5, and 7 of treatment periods 1-2; Days 1, 2, 5, 7, 10, and 14 of treatment period 3
measure: Amount of ELX-02 excreted in urine from 0 to 24 hours (Ae24h)
timeFrame: Day 1 of treatment periods 1, 2, and 3
measure: Renal clearance on Day 1 (Ae24h/plasma AUC0-24h)
timeFrame: Day 1 of treatment periods 1, 2, and 3
Secondary outcomes:
measure: Changes from baseline in WBC cystine levels
timeFrame: Screening; Days 1, 2, 5, and 7 of treatment periods 1-2; Days 1, 2, 5, 7, 10, and 14 of treatment period 3, and 4-week safety follow-up
Other outcomes:
Locations:
city: Montréal
country: Canada
facility: McGill University Health Center
state: Quebec
Study officials:
affiliation: McGill University
name: Paul Goodyer, MD
role: PRINCIPAL_INVESTIGATOR
References: