A Study to Evaluate the Pharmacodynamics and Safety of ARCT-810 in Participants With OTCD

Phase 2

Recruiting

• Conditions: Ornithine Transcarbamylase Deficiency; OTC Deficiency; OTCD
• Interventions: Biological: ARCT-810

• Registration Number: NCT06488313
• Lead Sponsor: Arcturus Therapeutics, Inc.

Brief Summary

Evaluate the safety and pharmacodynamics of multiple doses of ARCT-810 in adolescent and adult participants with OTC deficiency.

Detailed Description

This a Phase 2a, open-label study of ARCT-810 in participants 12 years of age and older living with OTC deficiency. After a diet stabilization period of at least 4 weeks, all participants will be enrolled to receive ARCT-810 every two weeks, for up to five doses, at one of three dose levels. Clinic visits will occur during screening and at Days 1, 15, 29, 36, 43, 57, 60, 71, and 85. During the study, participants will remain on their current clinical management for OTC deficiency. Dose escalation or cohort expansion may occur following completion of three participants at each dose level.

Study Timeline

• Study Start: 2024-06-10
• Study First Submitted: 2024-06-28
• Study First Submitted QC: 2024-06-28
• Status Verified: 2024-07
• Last Update Submitted: 2024-07-03
• Study First Posted: 2024-07-05
• Last Update Posted: 2024-07-05
• Primary Completion: 2026-06-01
• Study Completion: 2026-09-01

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 9

Inclusion Criteria

1. Willingness and ability to comply with all the protocol requirements, complete all study visits and sign informed consent.
2. Males and Females aged ≥12 years, at Screening.
3. Documented clinical diagnosis of OTC deficiency.
4. History of symptomatic hyperammonemia or elevated plasma ammonia or glutamine with clinical stability for at least 1 month prior to Screening.
5. Medically managed for OTC deficiency and receiving a stable protein-restricted diet, dietary supplements, and/or ammonia scavenger regimen (if applicable) for at least 28 days.
6. Good general health with no clinically significant abnormal findings that would interfere with study procedures (including plasma ammonia within participant's historical range).
7. Must be willing to adhere to contraception guidelines.

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Exclusion Criteria

1. Uncontrolled hypertension.
2. Symptoms of infection for at least 7 days prior to dosing.
3. Malignancy within 5 years, except for basal or squamous cell carcinoma of the skin or carcinoma in situ of the cervix that has been successfully treated.
4. History of any OTC gene therapy, or history of liver-derived stem cell therapy in the past 2 years.
5. History of any organ transplant.
6. History of severe allergic reaction to a liposomal or PEG-containing product.
7. History of congenital or acquired cardiac disorders.
8. Abuse of medications, illicit drugs or alcohol.
9. Blood donation of 50 to 499 mL within 30 days of screening or of >499 mL within 60 days of screening.
10. Clinically significant laboratory abnormalities on screening labs including INR >1.5, eGFR< 60 mL/min/1.73m2 or positive test results for HIV, HBV, or HCV.
11. Inadequately controlled diabetes.
12. Clinically significant anemia.
13. Changes in maintenance therapies for OTC deficiency with 28 days prior to dosing.
14. Medical history requiring continuous or intermittent systemic corticosteroid administration.
15. Receipt of inhibitors of urea synthesis or drugs that significantly affect renal clearance.
16. Recent treatment with another investigational drug, biological agent, or device.
17. Treatment with any oligonucleotide (siRNA or mRNA) within 6 months prior to screening. COVID-19 vaccines are not exclusionary.
18. Involved in study conduct or an immediate family member of an individual involved in the study.
19. Participated in another dosing cohort of the study.
20. Any other conditions, in the opinion of the investigator, that would interfere with participation.

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
ARCT-810	ARCT-810	Participants will receive up to 5 IV infusions of ARCT-810 administered at 14-day intervals.

Primary Outcome Measures

Name	Time	Method
Incidence, severity and dose-relationship of adverse events (AEs)	Day 85	Safety and tolerability of ARCT-810 assessed by incidence, severity, and dose-relationship of AEs

Secondary Outcome Measures

Name	Time	Method
Stable isotope ureagenesis assay values (AUC of first isotope)	Up to Day 85	Change from Baseline in stable isotope ureagenesis assay values (AUC of first isotope) following multiple doses of ARCT-810
Plasma Glutamine	Up to Day 85	Change from Baseline in plasma glutamine and labeled glutamine as available
Plasma pharmacokinetics	Up to Day 57	The noncompartmental plasma pharmacokinetics of ARCT-810 will be assessed based on the observed plasma concentration of ARCT-810 mRNA and lipid
Stable isotope ureagenesis assay values (AUC of second isotope)	Up to Day 85	Change from Baseline in stable isotope ureagenesis assay values (AUC of second isotope) following mulitple doses of ARCT-810
Fasting plasma ammonia	Up to Day 85	Proportion of participants maintaining normal morning fasting plasma ammonia

Trial Locations

Locations (1)

Uncommon Cures; 🇺🇸 Chevy Chase, Maryland, United States