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Vutrisiran

Phase 3

Transthyretin Amyloidosis (ATTR) With Cardiomyopathy | Small molecule | Cardiovascular |Alnylam Pharmaceuticals, Inc.|Last Updated: Feb 20, 2026

Target and mechanism

Molecular targetTTR
Target classRnai Inhibitor
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials2
Total Enrollment1,355

FDA Designations

No designations recorded

Clinical trial landscape

Vutrisiran · 2 trials · 1 indication

Phase 3 2
NCT06679946A Study to Evaluate Vutrisiran in Patients With Transthyretin Amyloidosis With CardiomyopathyTransthyretin Amyloidosis (ATTR) With Cardiomyopathy
ENROLLING BY_INVITATION700 Analytics
NCT04153149HELIOS-B: A Study to Evaluate Vutrisiran in Patients With Transthyretin Amyloidosis With CardiomyopathyTransthyretin Amyloidosis (ATTR) With Cardiomyopathy
ACTIVE NOT_RECRUITING655 Analytics
PHASE3ENROLLING BY_INVITATION
A Study to Evaluate Vutrisiran in Patients With Transthyretin Amyloidosis With Cardiomyopathy
Transthyretin Amyloidosis (ATTR) With CardiomyopathyUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
HELIOS-B: A Study to Evaluate Vutrisiran in Patients With Transthyretin Amyloidosis With Cardiomyopathy
Transthyretin Amyloidosis (ATTR) With CardiomyopathyUnlock trial analytics

Study Endpoints

Primary Endpoints

Frequency of Adverse Events (AEs)
Up to 36 Months

An AE is any untoward medical occurrence in a patient or clinical investigational subject administered a medicinal product and which does not necessarily have a causal relationship with this treatment.

Composite Endpoint of All-Cause Mortality and Recurrent Cardiovascular (CV) Events (CV Hospitalizations and Urgent Heart Failure [HF] Visits) in the Overall Population
Up to Month 36

All-cause mortality and recurrent CV events (CV hospitalizations and urgent HF visits) were compared between treatment groups using a modified Andersen-Gill model with a robust variance. All-cause mortality included heart transplantation and LVAD placement events along with deaths; recurrent CV events included CV hospitalizations and urgent HF visits. The number of participants with at least one CV event or all-cause mortality event have been reported here. No imputation was done for participants who dropped out early for the primary analysis of this composite outcome endpoint.

Composite Endpoint of All-Cause Mortality and Recurrent CV Events (CV Hospitalizations and Urgent HF Visits) in the Vutrisiran Monotherapy Subgroup
Up to Month 36

All-cause mortality and recurrent CV events (CV hospitalizations and urgent HF visits) were compared between treatment groups using a modified Andersen-Gill model with a robust variance. All-cause mortality included heart transplantation and LVAD placement events along with deaths; recurrent CV events included CV hospitalizations and urgent HF visits. The number of participants with at least one CV event or all-cause mortality event have been reported here. No imputation was done for participants who dropped out early for the primary analysis of this composite outcome endpoint.

Secondary Endpoints

Change from Baseline in the Kansas City Cardiomyopathy Questionnaire Overall Summary (KCCQ-OS)
Baseline up to 36 Months
Change from Baseline in New York Heart Association (NYHA) Class
Baseline up to 36 Months
Change From Baseline in the Cardiac Biomarker: N-terminal Prohormone of B-type Natriuretic Peptide (NT-proBNP)
Baseline up to 36 Months
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Vutrisiran 25 mgEXPERIMENTALParticipants will receive vutrisiran 25 mg administered subcutaneously (SC) once every 3 months (q3M).
PlaceboPLACEBO_COMPARATORParticipants received vutrisiran matching placebo administered SC q3M during the 36-month DB period. After the DB period, participants receive vutrisiran, 25 mg, SC injection, q3M for up to 24 months in the OLE period.

Interventions

NameTypeDescription
VutrisiranDRUGVutrisiran administered SC q3M
Sterile Normal Saline (0.9% NaCl)DRUGSterile normal saline (0.9% NaCl) will be administered by SC injection.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites87

Inclusion Criteria: * Patients who are participating in the patisiran parent studies ALN-TTR02-011 or ALN-TTR02-014 or who have completed the 24-month OLE Period in the vutrisiran parent study ALN-TTRSC02-003 Exclusion Criteria: * Has permanently discontinued study drug administration while parti...

Countries:United StatesArgentinaAustriaBelgiumBrazilCzechiaDenmarkFranceItalyNetherlandsNorwayPortugalSouth KoreaSpainSwedenTaiwanUnited KingdomAustraliaCanadaCroatiaGermanyHungaryIrelandIsraelJapanLatviaLebanonLithuaniaMalaysiaMoldovaPeruPolandSaudi ArabiaSloveniaThailand
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Frequently asked questions about Vutrisiran

What is Vutrisiran used for in transthyretin amyloidosis with cardiomyopathy?

Vutrisiran is an investigational small molecule being studied for the treatment of transthyretin amyloidosis (ATTR) with cardiomyopathy. It is in Phase 3 clinical development and is being evaluated in patients with this condition to assess its safety and efficacy.

What does Vutrisiran target?

Vutrisiran is a small molecule that belongs to the -siran (siRNA) target class. It is designed to target the underlying cause of transthyretin amyloidosis by reducing the production of transthyretin protein, which is involved in the disease process.

Who makes Vutrisiran?

Vutrisiran is being developed by Alnylam Pharmaceuticals, Inc., a biopharmaceutical company. Alnylam is the sponsor of the clinical trials evaluating Vutrisiran for transthyretin amyloidosis with cardiomyopathy, and its stock is traded under the ticker ALNY.

What phase is Vutrisiran in?

Vutrisiran is currently in Phase 3 clinical development. It is an investigational drug, meaning it has not been approved by regulatory authorities. Two Phase 3 trials are ongoing to evaluate its use in patients with transthyretin amyloidosis with cardiomyopathy.

What clinical trials is Vutrisiran in?

Vutrisiran is being studied in two Phase 3 clinical trials. The first is NCT04153149, known as HELIOS-B, which has enrolled 655 patients. The second is NCT06679946, which is enrolling by invitation and aims to enroll 700 patients. Both trials are evaluating Vutrisiran in transthyretin amyloidosis with cardiomyopathy.

Is Vutrisiran the same as any other drug?

Vutrisiran is a distinct investigational drug developed by Alnylam Pharmaceuticals. It is not known to be the same as any other approved medication. It is being studied specifically for transthyretin amyloidosis with cardiomyopathy in Phase 3 clinical trials.