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ION582

Phase 3

Angelman Syndrome | Small molecule | Rare Disease |Ionis Pharmaceuticals, Inc.|Trials Updated: Sep 29, 2026

ION582 development status

Highest phase Phase 3 (NCT07782827)
Phase scored for IONSPhase 1
Registered trials 3 across 1 sponsor since Nov 2021

ION582 target and mechanism

Molecular targetUBE3A-ATS
ModalitySmall molecule

Also known as obudanersen

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials3
Total Enrollment257

FDA Designations

No designations recorded

ION582 clinical trials

ION582 · 3 trials · 1 indication

Phase 3 2Phase 1 1
NCT07782827CHAMPION: A Study to Evaluate the Efficacy and Safety of Obudanersen (ION582) in Children and Adults With Angelman Syndrome (AS)Angelman Syndrome
RECRUITING30 Analytics
NCT06914609REVEAL: A Phase 3 Study of Obudanersen (ION582) in Angelman SyndromeAngelman Syndrome
ACTIVE NOT_RECRUITING156 Analytics
PHASE3RECRUITING
CHAMPION: A Study to Evaluate the Efficacy and Safety of Obudanersen (ION582) in Children and Adults With Angelman Syndrome (AS)
Angelman SyndromeUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
REVEAL: A Phase 3 Study of Obudanersen (ION582) in Angelman Syndrome
Angelman SyndromeUnlock trial analytics

Study Endpoints

Primary Endpoints

Change From Baseline in Performance on the Expressive Communication Domain Raw Score Without Caregiver Input of the Bayley Scales for Infant and Toddler Development-4 (Bayley-4) in Cohort 1
Baseline and Week 52
Change in Performance on the Expressive Communication Subdomain Raw Score of the Bayley Scales for Infant and Toddler Development-4 (Bayley-4) Without Caregiver Input in Cohort 1
Baseline and Week 52

The Bayley-4 is a performance-based assessment of developmental functioning across communication, cognition, and motor skills. The expressive communication subdomain of communication measures preverbal and verbal communication. The total raw score reflects the sum of all the item scores within the expressive communication subdomain, with higher scores reflecting greater expressive communication ability.

To evaluate the safety and tolerability of single and multiple doses of ION582 (incidence, severity, and dose-relationship of adverse effects and changes in the laboratory parameters).
Part 1: Up to Week 45; Part 2: Up to Week 81

The safety and tolerability of ION582 will be assessed by determining the incidence, severity, and dose relationship of adverse effects and changes in the laboratory parameters by dose.

Secondary Endpoints

Change From Baseline in Bayley-4: Cognition Scale Raw Score Without Caregiver Input
Baseline and Week 52
Change From Baseline in Aberrant Behavior Checklist - Second Edition - Community Version (ABC-2-C): Hyperactivity
Baseline and Week 52
Change From Baseline in (ABC-2-C): Irritability
Baseline and Week 52
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
obudanersen 80 mgEXPERIMENTALParticipants in Cohorts 1 and 2 will be administered obudanersen via intrathecal (IT) bolus injection every 12 weeks during the Treatment Evaluation and LTE periods.
Cohort 1 obudanersen 80 mgEXPERIMENTALParticipants (aged 2 to \<18 years old) will be administered obudanersen 80 mg via intrathecal (IT) injection every 12 weeks during the double blind and LTE treatment periods.
Cohort 1 PlaceboPLACEBO_COMPARATORParticipants (aged 2 to \<18 years old) will be administered obudanersen matching placebo via IT injection every 12 weeks during the double-blind treatment period and then administered obudanersen 40 mg or 80 mg every 12 weeks during the LTE treatment period.
Cohort 2 obudanersen 80 mgEXPERIMENTALParticipants (aged 18 to ≤50 years old) will be administered obudanersen 80 mg via IT injection every 12 weeks during the double blind and LTE treatment periods.
Cohort 2 PlaceboPLACEBO_COMPARATORParticipants (aged 18 to ≤50 years old) will be administered obudanersen matching placebo via IT injection every 12 weeks during the double-blind treatment period and then randomized to obudanersen 40 mg or 80 mg every 12 weeks during the LTE treatment period.
Part 1 MAD: Cohort AEXPERIMENTALION582 will be administered as IT injection over a period of 13 weeks, with a minimum of approximately 4 weeks between each dose administration.
Part 1 MAD: Cohort BEXPERIMENTALION582 will be administered as IT injection over a period of 13 weeks, with a minimum of approximately 4 weeks between each dose administration.
Part 1 MAD: Cohort CEXPERIMENTALION582 will be administered as IT injection over a period of 13 weeks, with a minimum of approximately 4 weeks between each dose administration.
Part 1 MAD: Cohort DEXPERIMENTALION582 will be administered as IT injection over a period of 13 weeks, with a minimum of approximately 4 weeks between each dose administration.
Part 1 MAD: Cohort EEXPERIMENTALION582 will be administered as IT injection of over a period of 13 weeks, with a minimum of approximately 4 weeks between each dose administration.
Part 1 MAD: Cohort FEXPERIMENTALION582 will be administered as IT injection over a period of 13 weeks, with a minimum of approximately 12 weeks between each dose administration.
Part 2 Group 1EXPERIMENTALION582 will be administered as IT injection of over a period of 49 weeks, with additional dosing intervals.
Part 2 Group 2EXPERIMENTALION582 will be administered as IT injection of over a period of 49 weeks, with additional dosing intervals.
Part 3 Group 1EXPERIMENTALION582 will be administered as IT injection of over a period of 145 weeks, with additional dosing intervals.
Part 3 Group 2EXPERIMENTALION582 will be administered as IT injection of over a period of 145 weeks, with additional dosing intervals.

Interventions

NameTypeDescription
obudanersenDRUGION582 will be administered by IT injection.
PlaceboDRUGobudanersen matching placebo will be administered by IT injection.
ION582DRUGION582 will be administered by IT injection.
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Eligibility Criteria

Age Range2 Years to 50 Years
SexALL
Healthy VolunteersNo
Study Sites1

Key Inclusion Criteria: 1. Clinical diagnosis of AS with molecular result indicating either paternal UPD of 15q11.2-q13 or ID of the maternal 15q11.2-q13 region, provided by the Investigator and confirmed by either a qualified central vendor or a qualified local geneticist at the site. 2. The parti...

Countries:United StatesAustraliaCanadaGermanyIsraelItalyJapanPolandSingaporeSouth KoreaSpainUnited KingdomFrance
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Recent Changes (Last 90 Days)

MEDIUMSep 29, 2026NCT06914609Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMSep 29, 2026NCT06914609Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWSep 28, 2026NCT07782827Status: NOT_YET_RECRUITING → RECRUITING
LOWSep 28, 2026NCT07782827Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 28, 2026NCT06914609lastUpdatePostDate: changed
LOWAug 28, 2026NCT06914609lastUpdatePostDate: changed
LOWAug 24, 2026NCT07782827NEW_TRIAL: changed
LOWAug 24, 2026NCT07782827NEW_TRIAL: changed
MEDIUMAug 20, 2026NCT05127226Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMAug 20, 2026NCT05127226Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMAug 12, 2026NCT06914609lastUpdatePostDate: changed
MEDIUMAug 12, 2026NCT06914609lastUpdatePostDate: changed
LOWJul 29, 2026NCT06914609lastUpdatePostDate: changed
LOWJul 29, 2026NCT06914609lastUpdatePostDate: changed

Frequently asked questions about ION582

What is ION582 used for?

ION582 is an investigational small molecule being developed for the treatment of Angelman Syndrome, a rare genetic disorder. It is currently in Phase 1 clinical development and has not been approved by regulatory authorities.

What does ION582 target?

ION582 targets UBE3A-ATS, a long non-coding RNA that regulates the expression of the UBE3A gene. By targeting UBE3A-ATS, ION582 aims to address the underlying genetic cause of Angelman Syndrome.

Who makes ION582?

ION582 is being developed by Ionis Pharmaceuticals, Inc., a biopharmaceutical company traded on NASDAQ under the ticker symbol IONS. The company is conducting clinical trials to evaluate the safety and efficacy of ION582.

What phase is ION582 in?

ION582 is in Phase 1 clinical development. It is an investigational drug and has not yet been approved by the FDA or other regulatory agencies. The ongoing Phase 1 trial is evaluating its safety, tolerability, pharmacokinetics, and pharmacodynamics.

What clinical trials is ION582 in?

ION582 is being studied in the HALOS trial (NCT05127226), a Phase 1 study of multiple ascending doses in participants with Angelman Syndrome. The trial is active but not recruiting, with an enrollment of 71 participants across the United States, Australia, France, Israel, Italy, and the United Kingdom.