CARDIO-TTRansform: A Study to Evaluate the Efficacy and Safety of Eplontersen (Formerly Known as ION-682884, IONIS-TTR-LRx and AKCEA-TTR-LRx) in Participants With Transthyretin-Mediated Amyloid Cardiomyopathy (ATTR CM)
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ClinicalTrials.gov Identifier: NCT04136171 |
Recruitment Status :
Recruiting
First Posted : October 23, 2019
Last Update Posted : April 5, 2022
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Condition or disease | Intervention/treatment | Phase |
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Transthyretin-Mediated Amyloid Cardiomyopathy (ATTR CM) | Drug: Eplontersen Drug: Placebo | Phase 3 |
Study Type : | Interventional (Clinical Trial) |
Estimated Enrollment : | 750 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | Double (Participant, Investigator) |
Primary Purpose: | Treatment |
Official Title: | A Phase 3 Global, Double-Blind, Randomized, Placebo-Controlled Study to Evaluate the Efficacy and Safety of ION-682884 in Patients With Transthyretin-Mediated Amyloid Cardiomyopathy (ATTR CM) |
Actual Study Start Date : | March 13, 2020 |
Estimated Primary Completion Date : | January 2024 |
Estimated Study Completion Date : | June 2024 |

Arm | Intervention/treatment |
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Experimental: Eplontersen
Eplontersen by subcutaneous injection once every 4 weeks
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Drug: Eplontersen
Eplontersen by subcutaneous injection
Other Names:
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Placebo Comparator: Placebo
Matching placebo by subcutaneous injection once every 4 weeks
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Drug: Placebo
Matching placebo by subcutaneous injection |
- Composite Outcome of Cardiovascular (CV) Mortality and recurrent CV clinical events at Week 120 [ Time Frame: Baseline to Week 120 ]
- Change From Baseline in the 6MWT Distance at Week 120 [ Time Frame: Baseline to Week 120 ]The 6MWT is a submaximal exercise test that entails measurement of distance walked over a span of 6 minutes. The 6MWT provides information regarding functional capacity, response to therapy and prognosis across a range of chronic cardiopulmonary conditions.
- Change From Baseline in the Kansas City Cardiomyopathy Questionnaire (KCCQ) Scores at Week 120 [ Time Frame: Baseline to Week 120 ]
The Kansas City Cardiomyopathy Questionnaire (KCCQ) is a 23-item self-administered questionnaire developed to independently measure the patient's perception of their health status, which includes heart failure symptoms, impact on physical and social function, and how their heart failure impacts their quality of life (QOL) within a 2-week recall period.
The KCCQ tool quantifies the following six (6) distinct domains and two (2) summary scores. KCCQ responses are provided along a rating scale continuum with equal spacing from worst to best, with a higher score equaling a better score.
- CV Clinical Events at Week 120 [ Time Frame: Baseline to Week 120 ]
- CV Mortality at Week 120 [ Time Frame: Baseline to Week 120 ]
- Rate of All-Cause Mortality at Week 120 [ Time Frame: Baseline to Week 120 ]

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Ages Eligible for Study: | 18 Years to 90 Years (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- Females must be non-pregnant and non-lactating, and either surgically sterile or post-menopausal or abstinent. If engaged in sexual relations of child-bearing potential, agree to use 1 highly effective contraceptive method
- Males must be surgically sterile or, abstinent or, if engaged in sexual relations with a woman of child-bearing potential, the participant or the participant's non-pregnant female partner must be using a highly effective contraceptive method
- Amyloid deposits in cardiac or non-cardiac tissue confirmed by Congo Red (or equivalent) staining OR technetium scintigraphy (99mTc -3,3-diphosphono-1,2- propanodicarboxylic acid [DPD-Tc], 99m Tc-pyrophosphate [PYP-Tc], or 99m Tc-hydroxymethylene-diphosphonate [HMDP-Tc]) with Grade 2 or 3 cardiac uptake in the absence of abnormal light chains ratio, centrally confirmed
- End-diastolic interventricular septum thickness of > 12 mm on Screening echocardiogram
- New York Heart Association (NYHA) class I-III
Exclusion Criteria:
- Acute coronary syndrome, unstable angina, stroke, transient ischemic attack (TIA), coronary revascularization, cardiac device implantation, cardiac valve repair, or major surgery within 3 months of Screening
- Cardiomyopathy not primarily caused by ATTR-CM, for example, cardiomyopathy due to hypertension, valvular heart disease, or ischemic heart disease
- Monoclonal gammopathy of undetermined significance (MGUS) and/or immunoglobulin free light chain ratio < 0.26 and > 1.65, unless fat, bone marrow, or heart biopsy confirming the absence of light chain by mass spectrometry or immunoelectron microscopy
- Prior liver or heart transplant, and/or Left Ventricular Assist Device (LVAD) or anticipated liver transplant or LVAD within 1 year after randomization
- Current or previous treatment with Tegsedi™ (inotersen) or Onpattro™ (patisiran) or other oligonucleotide or RNA therapeutic (including siRNA)
- Current treatment with diflunisal, doxycycline, and/or calcium-channel blocker. Participants receiving any of these agents must respect a wash-out period of 14 days before randomization.

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04136171
Contact: Ionis Pharmaceuticals | (844) 413-0219 | ionisNCT04136171study@clinicaltrialmedia.com |

Responsible Party: | Ionis Pharmaceuticals, Inc. |
ClinicalTrials.gov Identifier: | NCT04136171 |
Other Study ID Numbers: |
ION-682884-CS2 2019-002835-27 ( EudraCT Number ) |
First Posted: | October 23, 2019 Key Record Dates |
Last Update Posted: | April 5, 2022 |
Last Verified: | April 2022 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | No |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
Product Manufactured in and Exported from the U.S.: | Yes |
TTR Amyloidosis Cardiomyopathy |
Cardiomyopathies Amyloidosis Heart Diseases |
Cardiovascular Diseases Proteostasis Deficiencies Metabolic Diseases |