Phase 1 Study of ELX-02 in Healthy Adult Subjects

A Phase 1, Randomized, Double-Blinded, Placebo-Controlled, Third Party Open, Multiple Dose Escalation, Single Center Study to Evaluate the Safety, Tolerability and Pharmacokinetics of Subcutaneously Administered ELX-02 in Independent Consecutive Cohorts of Healthy Subjects

Phase 1 Multiple Ascending Dose Study in Normal Healthy Volunteers

Study Overview

• Status: Completed
• Conditions: Genetic Disease; Nonsense Mutation
• Intervention / Treatment: Drug: Placebo; Drug: ELX-02

Detailed Description

This is a study in humans of ELX-02, an advanced synthetic aminoglycoside optimized as a translational read-through drug (TRID) for the treatment of genetic conditions caused by nonsense mutations. This is a classical Phase 1b study designed as a randomized, double-blinded, placebo-controlled, multiple dose escalation to evaluate the safety, tolerability, and pharmacokinetics of ELX-02 in healthy adult volunteers.

• Study Type: Interventional
• Enrollment (Actual): 62
• Phase: Phase 1

Contacts and Locations

Study Locations

• Belgium
  • Antwerp, Belgium
    • SGS Life Sciences, Clinical Pharmacology Unit

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 55 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion criteria: Subjects must meet all of the following inclusion criteria to be eligible for enrollment into the study:

1. Be able and willing to provide written Informed Consent indicating that the subject has been informed of all pertinent aspects of the study.

2. Healthy female subjects and male subjects who, at the time of screening, are between the ages of 18 and 55 years, inclusive.

   Healthy is defined as no clinically relevant abnormalities identified by a detailed medical history, full physical examination, including blood pressure (BP) and pulse rate measurement, 12-lead electrocardiogram (ECG), and clinical laboratory tests.

3. Female subjects of non-childbearing potential must meet at least one of the following criteria:

   • Achieved postmenopausal status, defined as follows: cessation of regular menses for at least 12 consecutive months with no alternative pathological or physiological cause; post-menopausal status will be confirmed by a serum follicle-stimulating hormone level;
   • Have undergone a documented hysterectomy and/or bilateral oophorectomy;
   • Have medically confirmed ovarian failure. All other female subjects (including females with tubal ligations) will be considered to be of childbearing potential and may be enrolled if they have negative pregnancy tests at screening and admission day and agree to use a highly effective method of contraception for 14 days before first study drug administration and 28 days after last study drug administration. Female subjects of childbearing potential must agree to undergo repeated pregnancy tests.
4. Male subjects must be willing to use an effective method of contraception. They must agree to use a condom consistently and correctly, during the course of the study until 28 days after last study drug administration.
5. Not using any prescription medication and dietary supplements within 30 days or 5 half lives (whichever is longer) prior to the first study drug administration, except for contraceptives - nor be taking any over-the-counter (OTC) herbal or medicinal products. As an exception, acetaminophen/paracetamol may be used at doses of ≤2 g/day.
6. Non-smoking and no use of any tobacco or nicotine products (by declaration) for a period of at least 6 months prior to screening visit.
7. Be on no medication with potential to impair renal function (e.g., non steroidal anti inflammatory [NSAID]s) or with ototoxic potential (e.g., quinine, salicylates, aminoglycosides).
8. Normal renal function (glomular filtration rate >60 mL/min) based on creatinine plasma concentration and the Modification of Diet in Renal Disease (MDRD) equation for estimated glomular filtration rate. Subjects with lower MDRD clearance can be included on the condition that they have a normal 24h creatinine clearance (determined by a 24h urine collection).
9. Negative human immunodeficiency virus (HIV), hepatitis B surface antigen (HBsAg), hepatitis C virus antibody (HCV Ab) serology tests at screening.
10. No history of alcohol or DOA. Negative urine test for DOA and alcohol breath test at screening and Day -1.
11. No personal history (or current) or hereditary hearing loss, persistent tinnitus, persistent vertigo, persistent imbalance and persistent unsteadiness.
12. Body Mass Index (BMI) of 19.0 to 30.0 kg/m2 (inclusive); and a total body weight >50.0 kg (110 lbs) and <100.0 kg.

Exclusion criteria: Subjects with any of the following characteristics/conditions will not be included in the study:

1. Subjects who are investigational site staff members directly involved in the conduct of the study and their family members, site staff members otherwise supervised by the Investigator, or subjects who are the Sponsor employees directly involved in the conduct of the study.
2. Concurrent participation or participation in another clinical trial within at least 5 tissue half-lives prior to dosing (calculated from the previous study's last dosing day). If the previous trial involved agents with delayed effects or prolonged metabolism, a 12 months interval is required.
3. Evidence or history of clinically relevant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurologic, or allergic disease (including drug allergies). This includes any acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with study participation or investigational drug administration or may interfere with the interpretation of study results and, in the judgment of the Investigator, would make the subject inappropriate for entry into this study.
4. Presence of mitochondrial mutations making subject susceptible to aminoglycoside toxicity.
5. Subjects with any history of ear disease or surgeries, persistent dizziness or persistent tinnitus.

6. Subjects with any abnormality at screening, that indicates the presence of a vestibular pathology, conductive hearing loss or balance problem (by an ENT).

   Subjects with abnormalities in audiometry results at screening as follows: any pure-tone threshold >55 dB and/or inter-ear difference in any frequency of >20 dB.

   Dizziness Handicap Inventory (DHI)-H score>16. Tinnitus Handicap Inventory (THI)-H score >14.

7. History of regular alcohol consumption exceeding 14 drinks/week for females or 21 drinks/week for males (1 drink = 150 mL of wine or 360 mL of beer or 45 mL of hard liquor) within 6 months of screening.
8. Screening supine BP ≥ 140 mm Hg (systolic) or ≥ 90 mm Hg (diastolic), following at least 5 min of supine rest. If BP is ≥ 140 mm Hg (systolic) or ≥ 90 mm Hg (diastolic), the BP should be repeated two more times and the average of the three BP values should be used to determine the subject's eligibility.
9. Screening supine 12-lead ECG demonstrating QTc >450 msec for men and >470 msec for women, or a QRS interval >120 msec. If QTc or QRS exceed these limits, the ECG should be repeated two more times and the average of the three QTc or QRS values should be used to determine the subject's eligibility.
10. Subjects with ANY abnormalities in clinical laboratory tests at screening, considered by the study physician as clinically relevant. In particular, subjects with alanine aminotransferase (ALT), aspartate aminotransferase (AST), serum creatinine and total bilirubin ≥ 1.5 upper limit of normal will be excluded.
11. Pregnant or breastfeeding female subjects.
12. Subjects who donated blood or received blood or plasma derivatives in the three months preceding study drug administration.
13. Unwilling or unable to comply with all scheduled visits, treatment plan, laboratory tests and other study procedures and the restrictions described in this protocol.
14. Known relevant allergy to any drug and/or aminoglycosides.
15. Subjects with an inability to communicate well with the Investigators and CPU staff (e.g., language problem, poor mental development).
16. Subjects with visual impairment or inability to read and comprehend the DHI and THI scales.
17. Subjects with any acute medical situation (e.g., acute infection) within 48 hours of study start, which is considered of significance by the Investigator.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Placebo Comparator: Placebo Comparator Arm; Placebo	Drug: Placebo; Placebo
Experimental: ELX-02	Drug: ELX-02; ELX-02 is a synthetic, designer eukaryotic ribosomal specific glycoside (ERSG) optimized as a translational read-through drug

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Pharmacokinetic Parameters - Plasma AUC0-24	Day 1 Area under the curve (AUC0-24) of ELX-02 plasma concentration following the subcutaneous (SC) dose on Day 1 to 24 hours post-ose	Day 1: pre-dose, 15 min, 30 min, 45 min, 1h, 3h, 6h, 12h, 24h, post-dose
Pharmacokinetic Parameters- Plasma AUC0-24	Day 29 Area under the curve (AUC0-24) of ELX-02 plasma concentration following the subcutaneous (SC) dose on Day 29 to 24 hours post-dose	Day 29: pre-dose, 15 min, 30 min, 45 min, 1h, 3h, 6h, 12h, 24h, post-dose
Pharmacokinetic Parameters - Plasma Cmax	Day 1 Peak Plasma Concentration (Cmax) of ELX-02 following the subcutaneous (SC) dose on Day 1 to 72 hours post-dose	Day 1: pre-dose, 15 min, 30 min, 45 min, 1h, 3h, 6h, 12h, 24h, 36h, 48h, 72h, post-dose
Pharmacokinetic Parameters - Plasma Cmax	Day 29 Peak Plasma Concentration (Cmax) of ELX-02 following the subcutaneous (SC) dose on Day 29 to 72 hours post-dose	Day 29: pre-dose, 15 min, 30 min, 45 min, 1h, 3h, 6h, 12h, 24h, 36h, 48h, 72h post-dose
Pharmacokinetic Parameter - Plasma AUC0-inf	Day 1 Area under the curve (AUC0-inf) of ELX-02 plasma concentration following the subcutaneous (SC) dose on Day 1 extrapolated to infinity	Day 1: pre-dose, 15 min, 30 min, 45 min, 1h, 3h, 6h, 12h, 24h, 36h, 48h, 72h post dose
Pharmacokinetic Parameter - Plasma AUC0-inf	Day 29 Area under the curve (AUC0-inf) of ELX-02 plasma concentration following the subcutaneous (SC) dose on Day 29 extrapolated to infinity	Day 29: pre-dose, 15 min, 30 min, 45 min, 1h, 3h, 6h, 12h, 24h, 36h, 48h, 72h post dose
Pharmacokinetic Parameter - Plasma Tmax	Day 1 Time to maximum concentration (Tmax) of ELX-02 plasma concentrations following the subcutaneous (SC) dose on Day 1	Day 1: pre-dose, 15 min, 30 min, 45 min, 1h, 3h, 6h, 12h, 24h, 36h, 48h, 72h post-dose
Pharmacokinetic Parameter Plasma - Tmax	Day 29 Time to maximum concentration (Tmax) of ELX-02 plasma concentrations following the subcutaneous (SC) dose on Day 29	Day 29: pre-dose, 15 min, 30 min, 45 min, 1h, 3h, 6h, 12h, 24h, 36h, 48h, 72h post-dose
Pharmacokinetic Parameter - Plasma Rac(AUC24h)	Accumulation ratio, calculated as AUC24h Day29/AUC24h Day 1	Day 1 and Day 24 hr
Pharmacokinetic Parameter - Plasma RAC(Cmax)	Accumulation ratio, calculated as Cmax Day29/Cmax Day 1	Day 1 and Day 29
Urine Pharmacokinetics Parameter - Ae72h	Day 1 Cumulative amount of unchanged drug excreted into urine (Ae72h) of ELX-02 following the subcutaneous (SC) dose on Day 1	Day 1: pre-dose and during 0-12h, 12-24h, 24-48h, and 48-72h post-dose
Urine Pharmacokinetics Parameter - Ae72h	Day 29 Cumulative amount of unchanged drug excreted into urine (Ae72h) of ELX-02 following the subcutaneous (SC) dose on Day 29	Day 29: pre-dose and during 0-12h, 12-24h, 24-48h, and 48-72h post-dose
Urine Pharmacokinetic Parameter - Rmax	Day 1 Maximum rate of urinary extraction (Rmax) of EXL-02 in each collection time interval following the subcutaneous (SC) dose on Day 1	Day 1: pre-dose and during 0-12h, 12-24h, 24-48h, and 48-72h post-dose
Urine Pharmacokinetic Parameter - Rmax	Day 29 Maximum rate of urinary extraction (Rmax) of ELX-02 in each collection time interval following the subcutaneous (SC) dose on Day 29	Day 29: pre-dose and during 0-12h, 12-24h, 24-48h, and 48-72h post-dose
Urine Pharmacokinetics Parameter - Fe12h Day 1	Percent of dose excreted (Fe) in urine on Day 1	12 hours
Urine Pharmacokinetics Parameter - Fe 12h on Day 29	Percent of dose excreted (Fe) in urine on Day 29	12 h on Day 29
Urine Pharmacokinetics Parameter - CLR24h on Day 1	Renal clearance on Day 1 (CLR=Ae24h/plasmaAUC24h)	24 hours
Urine Pharmacokinetics Parameter - CLR24h	Renal clearance on Day 29 (CLR=Ae24h/plasmaAUC24h)	24 h

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Patients Experiencing at Least One Treatment-Emergent Adverse Events (TEAEs)	TEAEs are undesirable events not present prior to medical treatment, or an already present event that worsens either in intensity or frequency following the study treatment	Day 1-29

Collaborators and Investigators

• Sponsor: Eloxx Pharmaceuticals, Inc.
• Collaborators: SGS Life Sciences, a division of SGS Belgium NV

Publications and helpful links

General Publications

• Leubitz A, Vanhoutte F, Hu MY, Porter K, Gordon E, Tencer K, Campbell K, Banks K, Haverty T. A Randomized, Double-Blind, Placebo-Controlled, Multiple Dose Escalation Study to Evaluate the Safety and Pharmacokinetics of ELX-02 in Healthy Subjects. Clin Pharmacol Drug Dev. 2021 Aug;10(8):859-869. doi: 10.1002/cpdd.914. Epub 2021 Jan 19.

Helpful Links

• Eloxx Pharmaceuticals Website

Study record dates

Study Major Dates

• Study Start (Actual): October 11, 2017
• Primary Completion (Actual): June 17, 2019
• Study Completion (Actual): July 17, 2019

Study Registration Dates

• First Submitted: October 10, 2017
• First Submitted That Met QC Criteria: October 10, 2017
• First Posted (Actual): October 13, 2017

Study Record Updates

• Last Update Posted (Actual): March 16, 2021
• Last Update Submitted That Met QC Criteria: February 23, 2021
• Last Verified: February 1, 2021

More Information

Terms related to this study

• Keywords: Translational read through
• Additional Relevant MeSH Terms: Genetic Diseases, Inborn
• Other Study ID Numbers: EL-002

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No