Clinical trial Recruiting at 61 sites Phase 3 Interventional Ages 18 to 85

Nucresiran versus vutrisiran for hereditary transthyretin polyneuropathy

Official title: TRITON-PN: A Phase 3, Global, Randomized, Open-Label Study to Evaluate the Efficacy and Safety of Nucresiran in Patients With Hereditary Transthyretin-Mediated Amyloidosis With Polyneuropathy (hATTR-PN)

Run by Alnylam Pharmaceuticals · NCT07223203 · Data updated 2026-11-12

This trial tests whether nucresiran helps people with hereditary transthyretin-mediated amyloidosis with polyneuropathy by improving nerve function, symptoms, and quality of life and whether it lowers blood TTR more than vutrisiran.

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years to 85 Years
SexAll
Enrollment125 (estimated)
SponsorAlnylam Pharmaceuticals
Industry-sponsored
Locations61 sites (Aurora, Colorado and 60 other locations)
StatusRecruiting
StartedFebruary 3, 2026
Main results expectedDecember 27, 2027
Study endsJune 12, 2031
Registry record updatedOctober 8, 2026
Trial IDNCT07223203 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults with genetically confirmed hereditary transthyretin amyloidosis with polyneuropathy, NIS 5–130, KPS ≥60%, and acceptable liver, kidney, and cardiac status who can attend a study site.

Probably not a fit

Patients with non-hATTR amyloidosis, leptomeningeal involvement, NYHA class >2 heart failure, severe liver or renal dysfunction, prior or planned liver transplant, or other causes of neuropathy are unlikely to benefit from this trial.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This Phase 3, head-to-head interventional trial compares the RNAi therapeutic nucresiran to vutrisiran in adults with genetically confirmed hATTR-PN. Eligible participants have a documented TTR gene variant, a neuropathy impairment score (NIS) between 5 and 130, and a Karnofsky Performance Status of at least 60%. Participants receive assigned treatment and are followed for changes in neurologic impairment, quality of life, nutritional status, disability, and gait speed as well as serum transthyretin levels. The study excludes people with prior or planned liver transplant, non-hATTR forms of amyloidosis, significant heart failure, marked liver enzyme or bilirubin elevation, severe renal impairment, or other known causes of neuropathy.

Why it matters

Potential benefit: If successful, nucresiran could reduce TTR levels and slow or improve neuropathy symptoms and related disability for people with hATTR-PN.

How similar studies have gone: Other RNAi therapies for hATTR-PN such as patisiran and vutrisiran have shown clinical benefit, so the RNAi approach is established, but nucresiran's superiority is unproven.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Has documented diagnosis of hATTR-PN
* Has a diagnosis of hATTR amyloidosis with polyneuropathy with a documented TTR gene variant
* Has a neuropathy impairment score (NIS) of 5 to 130 (inclusive)
* Has a Karnofsky Performance Status (KPS) of ≥60%

Exclusion Criteria:

* Has had a liver transplant or is likely, in the opinion of the Investigator, to undergo liver transplantation during the Treatment Period of the study
* Has known other (non-hATTR) forms of amyloidosis or clinical evidence of leptomeningeal amyloidosis
* Has a New York Heart Association (NYHA) heart failure classification \>2
* Has alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \>2.5 upper limit of normal (ULN)
* Has total bilirubin \>1.5 ULN
* Has estimated glomerular filtration rate (eGFR) ≤30 mL/min/1.73m\^2
* Has other known causes of sensorimotor or autonomic neuropathy

Where it's running

  • Clinical Trial Site
    Aurora, Colorado, United States
    Recruiting
  • Clinical Trial Site
    Chicago, Illinois, United States
    Recruiting
  • Clinical Trial Site
    Baltimore, Maryland, United States
    Recruiting
  • Clinical Trial Site
    Boston, Massachusetts, United States
    Recruiting
  • Clinical Trial Site
    Rochester, Minnesota, United States
    Recruiting
  • Clinical Trial Site
    New York, New York, United States
    Recruiting
Show 44 more locations
  • Clinical Trial Site
    New York, New York, United States
    Recruiting
  • Clinical Trial Site
    Chapel Hill, North Carolina, United States
    Recruiting
  • Clinical Trial Site
    Nashville, Tennessee, United States
    Recruiting
  • Clinical Trial Site
    Dallas, Texas, United States
    Recruiting
  • Clinical Trial Site
    Houston, Texas, United States
    Recruiting
  • Clinical Trial Site
    Belgrano, Argentina
    Recruiting
  • Clinical Trial Site
    Rosario, Argentina
    Recruiting
  • Clinical Trial Site
    Darlinghurst, Australia
    Recruiting
  • Clinical Trial Site
    Woolloongabba, Australia
    Recruiting
  • Clinical Trial Site
    Ribeirão Preto, Brazil
    Recruiting
  • Clinical Trial Site
    Rio de Janeiro, Brazil
    Recruiting
  • Clinical Trial Site
    Rio de Janeiro, Brazil
    Recruiting
  • Clinical Trial Site
    Salvador, Brazil
    Recruiting
  • Clinical Trial Site
    São Paulo, Brazil
    Recruiting
  • Clinical Trial Site
    Vancouver, Canada
    Recruiting
  • Clinical Trial Site
    Égkomi, Cyprus
    Recruiting
  • Clinical Trial Site
    Créteil, France
    Recruiting
  • Clinical Trial Site
    Le Kremlin-Bicêtre, France
    Recruiting
  • Clinical Trial Site
    Marseille, France
    Recruiting
  • Clinical Trial Site
    Berlin, Germany
    Recruiting
  • Clinical Trial Site
    Heidelberg, Germany
    Recruiting
  • Clinical Trial Site
    Münster, Germany
    Recruiting
  • Clinical Trial Site
    Athens, Greece
    Recruiting
  • Clinical Trial Site
    Heraklion, Greece
    Recruiting
  • Clinical Trial Site
    Dublin, Ireland
    Recruiting
  • Clinical Trial Site
    Florence, Italy
    Recruiting
  • Clinical Trial Site
    Milan, Italy
    Recruiting
  • Clinical Trial Site
    Padova, Italy
    Recruiting
  • Clinical Trial Site
    Pavia, Italy
    Recruiting
  • Clinical Trial Site
    Roma, Italy
    Recruiting
  • Clinical Trial Site
    Bunkyo C, Japan
    Recruiting
  • Clinical Trial Site
    Kumamoto, Japan
    Recruiting
  • Clinical Trial Site
    Matsumoto-shi, Japan
    Recruiting
  • Clinical Trial Site
    Suita, Japan
    Recruiting
  • Clinical Trial Site
    Kuala Lumpur, Malaysia
    Recruiting
  • Clinical Trial Site
    Guadalajara, Mexico
    Recruiting
  • Clinical Trial Site
    Tlalpan, Mexico
    Recruiting
  • Clinical Trial Site
    Lisbon, Portugal
    Recruiting
  • Clinical Trial Site
    Porto, Portugal
    Recruiting
  • Clinical Trial Site
    Seoul, South Korea
    Recruiting
  • Clinical Trial Site
    Seoul, South Korea
    Recruiting
  • Clinical Trial Site
    Barcelona, Spain
    Recruiting
  • Clinical Trial Site
    Huelva, Spain
    Recruiting
  • Clinical Trial Site
    L'Hospitalet de Llobregat, Spain
    Recruiting

+11 more sites. See ClinicalTrials.gov for the full list.

Study contacts

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.