A Phase 3 Study to Evaluate the Safety and Efficacy of AOC 1044 (Also Referred to as Delpacibart Zotadirsen) in Participants With DMD With Gene Mutations Amenable to Exon 44 Skipping
Muscular Dystrophies · Muscular Dystrophies (Duchenne, Becker, Myotonic Dystrophy) · Muscular Disorders, Atrophic · Muscular Disease · Musculoskeletal Diseases · Neuromuscular Diseases (NMD) · Nervous System Diseases · Genetic Diseases · X-Linked · Hereditary · Neonatal Disease · Duchene Muscular Dystrophy · Congenital · DMD
What this study involves
The registry says this study is recruiting. Individual locations may have different availability.
- Study type
- Interventional
- Phase
- Phase 3
- Age range
- 7 years - 16 years
- Sex eligible
- Male
- Healthy volunteers
- Not accepted
- Participants
- 70 Estimated
These are starting points, not an eligibility decision. The research team must review the full requirements.
About the research
A Randomized, Double-blind, Placebo-controlled, Phase 3 Study to Evaluate the Efficacy and Safety of Intravenous AOC 1044 for the treatment of Duchenne Muscular Dystrophy (DMD) with Gene Mutations Amenable to Exon 44 Skipping
Read the full description
The study consists of a Screening Period of up to 44 Days, a Randomized 54 Week Treatment Period, a 54 Week Open Label Extension (OLE), and a Follow-Up Period of 6 weeks. Participants will be randomized to receive an intravenous infusion of either delpacibart-zotadirsen or placebo at the clinical study site every 6 weeks for a total of 9 doses. After completion of the randomized treatment period, all participants may enter the OLE portion of the study consisting of 9 doses of AOC 1044 regardless of group assignment in the randomized period. The final dose will occur at Week 102, followed by a final assessment at Week 108 and a safety follow-up visit at Week 114. An Independent Data Monitoring Committee (IDMC) comprising members independent and external to the Sponsor will review safety, tolerability, and efficacy (as needed) data of this study at regular intervals.
Who may be able to participate?
The list below is the sponsor’s full registry wording. It can include conditions, prior treatment, test results and other requirements. A match in search does not mean you qualify.
Key Inclusion Criteria:
- Ambulatory males with clinical and genetic diagnosis of DMD
- Acceptable genetic test confirming dystrophin gene mutation amenable to exon 44 skipping
- 7 to 16 years of age at time of consent
- TTR and NSAA assessment completed within the protocol specified parameters at Screening
- On a stable regimen of corticosteroids (including Vamolorone) for at least 6 months prior to Day 1. Steroid regimen must be anticipated to remain stable.
Key Exclusion Criteria:
- Previous treatment cell or gene therapy.
- Treatment with another oligonucleotide within 6 months of informed consent (not including COVID-19 RNA vaccines).
- Lab values outside of the protocol specified range at Screening
- If on any of the following treatments (growth hormone, testosterone or givinostat), participants must be on a stable regimen and must plan to maintain it for the duration of the study. Participants will be excluded if regimen stability prior to informed consent is as follows:
- Less than 1 month, for growth hormone and/or testosterone
- Less than 6 months for givinostat
Treatment, groups and participation
The registry may describe treatments and study duration without a complete visit calendar. Ask the study team for the exact schedule, procedures, risks, costs and alternatives. Keep your usual care plan unless your treating clinician tells you otherwise.
- Assignment
- Random assignment
- Masking
- Quadruple masked
AOC 1044
Participants will receive AOC 1044 intravenously (IV) every 6 weeks (Q6W) during the 54-week double-blind treatment period, followed by a 54-week open-label treatment period in which the same participants will continue to receive AOC 1044 IV Q6W
Drug: AOC 1044
Placebo
Participants will receive placebo (saline) IV Q6W during the 54-week double-blind treatment period, followed by a 54-week open-label treatment period in which all participants will then receive AOC 1044 IV Q6W
Drug: Placebo
AOC 1044 DRUG
AOC 1044 will be administered by intravenous (IV) infusion
Placebo DRUG
Placebo will be administered by intravenous (IV) infusion
What researchers are measuring
Outcome measures describe what is being studied. They are not proof that a treatment works.
Primary measures
Change from Baseline in Time to Rise (TTR) Velocity at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Secondary measures
Change from Baseline in Creatine Kinase (CK) at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Change from Baseline in 4-Stair Climb (4SC) Velocity at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Change from Baseline in 10-Meter Walk/Run Test (10MWRT) Velocity at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Change from Baseline in Stride Velocity 95th Centile (SV95C) at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Change from Baseline in North Star Ambulatory Assessment (NSAA) Total Score at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Change from Baseline in DMD Quality of Life (DMD-QoL) Score at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Change from Baseline in Patient Global Impression of Severity (PGI-S) at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Change from Baseline in Caregiver Global Impression of Severity (CaGI-S) at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Patient Global Impression of Change (PGI-C) at Week 54
Time frame: Week 54
Not reported in this registry record.
Caregiver Global Impression of Change (CaGI-C) at Week 54
Time frame: Week 54
Caregiver Global Impression of Change (CaGI-C) at Week 54
Change from Baseline in Quantitative Muscle Testing (QMT) at Week 54
Time frame: Baseline, Week 54
Not reported in this registry record.
Review the complete result tables and limitations in the official record.
Open official results ↗Research locations (20)
The overall study status and a local site’s status can differ. Confirm that location’s availability before traveling.
20 locations
The Children's Hospital at WestmeadWestmead, New South Wales, AustraliaRecruiting
UZ LeuvenLeuven, BelgiumRecruiting
Centre Hospitalier Régional de la CitadelleLiège, BelgiumRecruiting
London Health Sciences Centre - Victoria HospitalLondon, Ontario, CanadaRecruiting
CHU de Nantes - Hotel-DieuNantes, FranceRecruiting
AP-HP Hospital Armand-TrousseauParis, FranceRecruiting
Universitaetsklinikum EssenEssen, GermanyRecruiting
Universitaetsklinikum HeidelbergHeidelberg, GermanyRecruiting
Klinikum der Ludwig-Maximilians-Universitaet MuenchenMünchen, GermanyRecruiting
Istituto Giannina GasliniGenova, ItalyRecruiting
Fondazione Serena ETS - Centro Clinico NeMO MilanoMilan, ItalyRecruiting
IRCCS Ospedale San RaffaeleMilan, ItalyRecruiting
Fondazione Policlinico Universitario A. Gemelli IRCCS - Universitario Cattolica del Sacro CuoreRoma, ItalyRecruiting
Academisch Ziekenhuis LeidenLeiden, NetherlandsRecruiting
Uniwersyteckie Centrum Kliniczne, GdańskGdansk, PolandRecruiting
Hospital Sant Joan de DeuBarcelona, SpainRecruiting
Hospital Universitario La PazMadrid, SpainRecruiting
Hospital Viamed Santa Angela De la Cruz - FutureMeds SpainSeville, SpainRecruiting
Royal Victoria InfirmaryNewcastle, United KingdomRecruiting
University of Oxford and Oxford University Hospitals NHS Foundation TrustOxford, United KingdomRecruiting
Study team and timeline
- Lead sponsor
- Avidity Biosciences, Inc.
- Study start
- Sep 1, 2026 Actual
- Primary completion
- 2029-05 Estimated
- Study completion
- 2030-07 Estimated
- First posted
- May 14, 2026 Actual
- Last updated
- Nov 10, 2026 Actual
Official study contacts
Official study title
A Phase 3, Randomized, Double-Blind, Placebo-Controlled, Global Study With an Open-Label Extension to Evaluate the Efficacy and Safety of Intravenous AOC 1044 (Delpacibart Zotadirsen) for the Treatment of DMD With Gene Mutations Amenable to Exon 44 Skipping
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Source: ClinicalTrials.gov API v2. Information is submitted by sponsors and investigators. NLM does not approve the safety or science of all listed studies. Registry disclaimer.
Retrieved: Nov 12, 2026 · Last registry update: Nov 10, 2026
