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MAGNITUDE: A Phase 3 Study of NTLA-2001 in Participants With Transthyretin Amyloidosis With Cardiomyopathy (ATTR-CM)

MAGNITUDE: A Phase 3 Study of NTLA-2001 in Participants With Transthyretin Amyloidosis With Cardiomyopathy (ATTR-CM)

Recruiting
18-90 years
All
Phase 3

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Overview

To evaluate the efficacy and safety of a single dose of NTLA-2001 compared to placebo in participants with ATTR-CM.

Description

This is a multinational, multicenter, double-blind, placebo-controlled study in approximately 1200 participants, who will be randomized to receive a single infusion of either NTLA-2001 or placebo.

Eligibility

Inclusion Criteria:

  • Documented diagnosis of ATTR amyloidosis with cardiomyopathy
  • Medical history of heart failure (HF)
  • Symptoms of HF are optimally managed and clinically stable within 28 days prior to administration of study intervention
  • Screening NT-proBNP, a blood marker of HF severity, greater than or equal to 600 pg/mL and less than 10,000 pg/mL

Exclusion Criteria:

  • New York Heart Association (NYHA) Class IV HF
  • Polyneuropathy Disability score of IV (confined to wheelchair or bed)
  • Has hepatitis B, hepatitis C or human immunodeficiency virus (HIV) infection
  • History of active malignancy within 3 years prior to screening
  • RNA silencer therapy (patisiran, inotersen and/or eplontersen) within 12 months prior to dosing. Any prior vutrisiran use is not allowed
  • Initiation of tafamidis or acoramidis within 56 days prior to study dosing
  • Estimated glomerular filtration rate (eGFR) \<30 mL/min/1.73m\^2
  • History of liver disease
  • Uncontrolled blood pressure
  • Unable or unwilling to take vitamin A supplementation for the duration of the study

Study details
    Transthyretin Amyloidosis (ATTR) With Cardiomyopathy

NCT06128629

Intellia Therapeutics

13 May 2026

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