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Ionis Completes Enrollment of REVEAL Cohort 1

July 6, 2026

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Ionis announced that they have completed enrollment of Cohort 1 in the Phase 3 clinical trial of ION582, REVEAL.

“Guided by input from the Angelman community, REVEAL was intentionally designed to evaluate obudanersen across a broad range of people living with Angelman syndrome, reflecting the real-world diversity of this condition. We are deeply grateful to the entire Angelman syndrome community, especially the participants and their families, whose partnership made this achievement possible.” – Holly Kordasiewicz, Ph.D., executive vice president, chief development officer, Ionis. 

Individuals enrolled in REVEAL are assigned to study “Cohorts” based on their age. 

  • Individuals aged 2 – <18 years old are assigned to Cohort 1
  • Individuals aged 18 – ≤50 years old are assigned to Cohort 2. 

While enrollment in Cohort 1 has been completed, participating sites continue to screen participants for Cohort 2.

More Information

Read the Community Letter

Read the Press Release

Learn more about REVEAL