Enrolling by invitation

Eplontersen Long-Term Safety for Transthyretin-Mediated Amyloid Cardiomyopathy

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What is being tested

Eplontersen

Drug
Who is being recruted

Amyloidosis+1

+ Metabolic Diseases

+ Nutritional and Metabolic Diseases

Over 18 Years
See all eligibility criteria
How is the trial designed

Treatment Study

Phase 3
Interventional
Study Start: November 2022
See protocol details

Summary

Principal SponsorIonis Pharmaceuticals, Inc.
Last updated: January 28, 2026
Sourced from a government-validated database.Claim as a partner

Study start date: November 30, 2022

Actual date on which the first participant was enrolled.

This study aims to evaluate the long-term safety of a medication called Eplontersen (ION-682884) in treating patients with a condition known as Transthyretin-Mediated Amyloid Cardiomyopathy (ATTR-CM). This condition affects the heart and is caused by the accumulation of abnormal proteins. ATTR-CM can lead to heart failure and other severe health issues, so finding a safe and effective long-term treatment is crucial for improving patients' quality of life. The study includes up to 1400 participants who were previously part of another study involving Eplontersen. Participants in this study will receive Eplontersen treatment every four weeks for up to 36 months, or until the medication becomes available in their country. Additionally, they will take daily doses of vitamin A as recommended. The study will monitor several health indicators to determine the safety of the treatment, including kidney function, platelet count, and protein levels in urine. Researchers will also keep track of any adverse events or serious side effects that participants experience to ensure the medication is safe for long-term use.

Official TitleAn Open-Label Extension Study to Assess the Long-Term Safety of Eplontersen (ION-682884) in Patients With Transthyretin-Mediated Amyloid Cardiomyopathy (ATTR-CM)
NCT05667493
Principal SponsorIonis Pharmaceuticals, Inc.
Last updated: January 28, 2026
Sourced from a government-validated database.Claim as a partner

Protocol

This section provides details of the study plan, including how the study is designed and what the study is measuring.
Design Details

1400 patients to be enrolled

Total number of participants that the clinical trial aims to recruit.

Treatment Study

These studies test new ways to treat a disease, condition, or health issue. The goal is to see if a new drug, therapy, or approach works better or has fewer side effects than existing options.



Eligibility

Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.
Conditions
Criteria

Any sex

Biological sex of participants that are eligible to enroll.

Over 18 Years

Range of ages for which participants are eligible to join.

Healthy volunteers not allowed

If individuals who are healthy and do not have the condition being studied can participate.

Conditions

Pathology

AmyloidosisMetabolic DiseasesNutritional and Metabolic DiseasesProteostasis Deficiencies

Criteria

Inclusion Criteria: 1. Satisfactory completion of Treatment Period and the End of Treatment Visit of the Index Study (ION-682884-CS2) OR diagnosis of ATTR-CM and satisfactory participation on ISIS 420915- CS101 study as judged by the Investigator and Sponsor. 2. Investigator is willing to treat the participant with open-label eplontersen. 3. Willingness to adhere to vitamin A supplementation per protocol. Exclusion Criteria: 1. Permanently discontinued study drug administration while participating in the Index Study (ION 682884-CS2) or IST (ISIS 420915-CS101 Study). 2. Have any new condition or worsening of an existing condition that in the opinion of the Investigator or Sponsor would make the participant unsuitable for enrolment, or which could interfere with the participant participating in or completing the study, including the need for treatment with medications disallowed in the Index Study.

Study Plan

Find out more about all the medication administered in this study, their detailed description and what they involve.
Treatment Groups
Study Objectives

One single intervention group is designated in this study

This study does not include a placebo group 

Treatment Groups

Group I

Experimental
Eplontersen will be administered once every month by sub-cutaneous (SC) injection for up to 36 months or 6 months after eplontersen is approved and available in the site's country, whichever occurs first.

Study Objectives

Primary Objectives

Secondary Objectives

Study Centers

These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.

This study has 122 locations

Suspended

Mayo Clinic

Scottsdale, United StatesOpen Mayo Clinic in Google Maps
Suspended

Cedars-Sinai Medical Center

Beverly Hills, United States
Suspended

Altman Clinical and Translational Research Institute - Center for Clinical Research

La Jolla, United States
Suspended

University Of California San Francisco Urology Practice

San Francisco, United States
Enrolling by invitation122 Study Centers