The CARDIO-TTRansform Scintigraphy Sub-study

November 25, 2025 updated by: Ionis Pharmaceuticals, Inc.

CARDIO-TTRansform ION-682884-CS2-Scintigraphy Sub-study

The purpose of this study is to examine the changes in amyloid myocardial burden in a subset of the population participating in the ION682884-CS2 (NCT04136171) study, up to 150 participants, after treatment with eplontersen or placebo based on scintigraphy scans performed at Week 140 using the Perugini grade score method.

Study Overview

Status

Active, not recruiting

Conditions

Intervention / Treatment

Detailed Description

Participants who were randomized in Study ION-682884-CS2 (NCT04136171) and have had a baseline scintigraphy scan will be offered the opportunity to participate in this sub-study which involves optional scintigraphy scans.

Study Type

Observational

Enrollment (Estimated)

150

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Spain
      • Majadahonda, Spain, 28222
        • Hospital Universitario Puerta de Hierro
  • United States
    • New York
      • New York, New York, United States, 10032
        • Columbia University Irving Medical Center
    • North Carolina
      • Durham, North Carolina, United States, 27710
        • Duke University Medical Center
    • Ohio
      • Cleveland, Ohio, United States, 44195
        • Cleveland Clinic Main Campus
    • Oregon
      • Portland, Oregon, United States, 97239
        • Oregon Health and Science University

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Probability Sample

Study Population

Participants who were randomized in Study ION-682884-CS2 (NCT04136171) and who signed informed consent for the Scintigraphy sub-study will participate in this sub-study.

Description

Inclusion Criteria:

  • Participants must have been properly randomized into the ION-682884-CS2 study (NCT04136171) and should have had a baseline scintigraphy scan (99mTc-DPD, 99mTc- PYP, and 99mTc-HMDP) within 12 months prior to screening for ION-682884-CS2 with planar and SPECT or SPECT/CT images that can be read by the central reader.

Exclusion criteria:

  • Must not meet any of the exclusion criteria of the study protocol ION-682884-CS2 (NCT04136171).
  • Must not have weight or body girth that exceeds the limits of the equipment specifications.
  • Should not have any previously reported hypersensitivity reaction to Technetium-99m.

Study Plan

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

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
ION-682884-CS2 Scintigraphy Subset
Participants randomized in ION-682884-CS2 (NCT04136171) study to receive either eplontersen or placebo with baseline scintigraphy scan with planar and single-photon emission computerized tomography (SPECT) or SPECT with computed tomography (SPECT/CT) images will undergo an optional scintigraphy scan at Weeks 25 or 37, Week 97, and an additional scan at Week 140.
Diagnostic test: Scintigraphy scan
Scans will be performed as specified in the arm description.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Changes From Baseline in Perugini Grading Score From Scintigraphy Scan Images at Week 140
Time Frame: Baseline up to Week 140
The Perugini grading scale visually compares tracer uptake in the myocardium and ribs following injection of the bone tracers (99mTc-DPD, 99mTc-Pyrophosphate [PYP], or 99mTc-HMDP). The scale includes 4 grade classifications: Grade 0- no cardiac uptake and normal rib uptake, Grade 1- cardiac uptake which is less than rib uptake, Grade 2- cardiac uptake with intensity similar rib uptake, and Grade 3- cardiac uptake greater than rib uptake with mild or absent rib uptake. Visual scores of 2 or greater are classified as ATTR-positive and less than 2 are interpreted as ATTR-negative.
Baseline up to Week 140

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Ionis Pharmaceuticals, Inc.

Collaborators

AstraZeneca

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

April 4, 2023

Primary Completion (Estimated)

March 1, 2026

Study Completion (Estimated)

March 1, 2026

Study Registration Dates

First Submitted

October 4, 2023

First Submitted That Met QC Criteria

October 4, 2023

First Posted (Actual)

October 10, 2023

Study Record Updates

Last Update Posted (Actual)

November 28, 2025

Last Update Submitted That Met QC Criteria

November 25, 2025

Last Verified

November 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • ION-682884-CS2-Scintigraphy
  • 2019-002835-27 (EudraCT Number)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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