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New hope for angelman syndrome: experimental drug ION582 enters human trials

NCT ID NCT05127226

Disease control Sponsor: Ionis Pharmaceuticals, Inc. Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Aug 21, 2026 · Updated 2 times

Summary

This study tests a drug called ION582 for people with Angelman syndrome, a genetic condition causing developmental delays and seizures. The drug is given via a spinal injection. The main goal is to check safety and how the body processes the drug. Up to 70 participants aged 0 to 50 will take part.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
ION582
What this could lead to
If successful, this could point toward a treatment that improves symptoms and quality of life for people with Angelman syndrome.
What could go wrong
This is an early-phase trial with only 70 participants, so safety and effectiveness are not yet proven. The drug is given via spinal injection, which carries risks like headache or infection.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 1/2

Runs two stages together: safety and dose first, then whether the treatment works.

Participants

71 people

The number who actually took part.

Started

Dec 2021

Expected to finish

Mar 2029

An estimate. End dates often move.

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

0 to 50 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Key Inclusion Criteria: 1. Participant has a documented and certified diagnosis of Angelman syndrome (AS) (ubiquitin-protein ligase E3A \[UBE3A\] deletion or UBE3A mutation) 2. Male or female between the ages of 0-50 years of age, with signed informed consent from parent(s) or legal guardian(s) 3. Currently receiving stable standard of care treatments such as, stable doses of anti-epileptic medication, behavioral management medications, sleep medications, gabapentin, cannabidiol, and including special diets, supplements or nutritional support for at least 3 months prior to first dose. 4. Follow good study practice and not participate in the sharing of personal or study information on social media platforms, such as any website or social media site (e.g., Facebook, Instagram, Twitter, YouTube, etc.) until notified that the study is completed. Key Exclusion Criteria: 1. Has documented molecular AS confirmation of paternal uniparental disomy (UPD) or imprinting defect (ID). 2. Any clinically significant (CS) cardiovascular, endocrine, hepatic, renal, pulmonary, gastrointestinal, neurologic, malignant, metabolic, psychiatric, or other condition that, in the judgment of the Investigator, will pose a safety risk, will make the patient unsuitable for participation in, and/or unable to complete the study procedures. Has poorly controlled seizures as determined by the Investigator or has documented Status Epilepticus in the past 6 months that could pose a safety risk while on study. 3. Known bone, spine, bleeding, or other disorder that exposes the patient to risk of injury or unsuccessful lumbar puncture. Previous treatment with an oligonucleotide (including small interfering ribonucleic acid, antisense oligonucleotide \[ASOs\]). COVID-19 vaccinations are allowed. 4. Any prior use of gene therapy. Have any other conditions, which, in the opinion of the Investigator would make the participant unsuitable for inclusion or could interfere with the participant taking part in or completing the study.

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Conditions

The condition(s) this trial relates to.

Angelman syndrome

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Angelman syndrome

Contacts and locations

Locations

  • Azienda Ospedaliera Universitaria Pisana

    Pisa, 56126, Italy

  • Boston Children's Hospital

    Boston, Massachusetts, 02215, United States

  • Colorado Children's Hospital Research Institute

    Aurora, Colorado, 80045, United States

  • Necker-Enfants Malades Hospital

    Paris, 75015, France

  • Rady Children's Hospital

    San Diego, California, 92123, United States

  • Rush University Medical Center

    Chicago, Illinois, 60612, United States

  • STRONG Group University of Oxford

    Oxford, Oxfordshire, OX3 9DU, United Kingdom

  • Sheba Medical Center

    Ramat Gan, 5262100, Israel

  • Sydney Children's Hospital, Kids Cancer Centre

    Randwick, NSW 2031, Australia

  • Texas Children's Hospital

    Houston, Texas, 77030, United States

  • University of North Carolina at Chapel Hill School of Medicine

    Carrboro, North Carolina, 27510, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.