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ALN-6400

Phase 2

Von Willebrand Disease (VWD) | Small molecule | Hematology |Alnylam Pharmaceuticals, Inc.|Trials Updated: Oct 15, 2026

ALN-6400 development status

Highest phase Phase 2
Registered trials 2 across 1 sponsor since Oct 2024

ALN-6400 target and mechanism

Molecular targetPlasminogen
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLED
Total Trials2
Total Enrollment113

FDA Designations

No designations recorded

ALN-6400 clinical trials

ALN-6400 · 2 trials · 3 indications

Phase 2 1Phase 1 1
NCT07575308HMBeacon: A Phase 2 Study to Evaluate ALN-6400 in Adult and Adolescent Female Patients With VWD and HMBVon Willebrand Disease (VWD)
RECRUITING24 Analytics
PHASE2RECRUITING
HMBeacon: A Phase 2 Study to Evaluate ALN-6400 in Adult and Adolescent Female Patients With VWD and HMB
Von Willebrand Disease (VWD)Unlock trial analytics

Study Endpoints

Primary Endpoints

Frequency of Adverse Events
Up to Week 72
Part A: Frequency of Adverse Events
Up to Week 36
Part B: Frequency of Adverse Events
Up to Week 96

Secondary Endpoints

Change from Baseline in Plasminogen (PLG) Plasma Activity Levels
Screening and up to Week 72 postdose
Change from Baseline in PLG Plasma Protein Levels
Screening and up to Week 72 postdose
Change from Baseline in Menstrual Blood Loss Via Pictorial Blood Assessment Chart (PBAC)
Screening and up to Week 72 postdose
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
ALN-6400 (Treatment Group A)EXPERIMENTALParticipants will be administered multiple doses of ALN-6400.
ALN-6400 (Treatment Group B)EXPERIMENTALParticipants will be administered multiple doses of ALN-6400.
Part A: ALN-6400EXPERIMENTALParticipants will be administered a single dose of ALN-6400.
Part A: PlaceboPLACEBO_COMPARATORParticipants will be administered a single dose of placebo.
Part B: ALN-6400EXPERIMENTALParticipants will be administered multiple doses of ALN-6400.
Part B: PlaceboPLACEBO_COMPARATORParticipants will be administered multiple doses of placebo.

Interventions

NameTypeDescription
ALN-6400DRUGALN-6400 will be administered subcutaneously (SC).
PlaceboDRUGPlacebo will be administered subcutaneously (SC)
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Eligibility Criteria

Age Range16 Years to 45 Years
SexFEMALE
Healthy VolunteersNo
Study Sites11

Inclusion Criteria - * Is an adolescent or adult patient with a diagnosis of VWD (including Type 1, Type 2, Type 3, and platelet-type VWD) and HMB for 2 cycles during screening Exclusion Criteria - * Has alanine aminotransferase (ALT) or aspartate aminotransferase (AST) greater than 2 times the u...

Countries:United StatesNetherlandsSwedenUnited KingdomAustraliaCanadaFranceGermanySpain
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Competitive Landscape -Von Willebrand Disease 12 trials (matched to "Von Willebrand Disease (VWD)")

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Recent Changes (Last 90 Days)

LOWOct 15, 2026NCT06659640lastUpdatePostDate: changed
LOWOct 15, 2026NCT06659640lastUpdatePostDate: changed
LOWSep 19, 2026NCT07575308lastUpdatePostDate: changed
LOWSep 19, 2026NCT07575308lastUpdatePostDate: changed
LOWSep 19, 2026NCT07575308lastUpdatePostDate: changed
LOWSep 16, 2026NCT06659640lastUpdatePostDate: changed
LOWSep 16, 2026NCT06659640lastUpdatePostDate: changed
LOWAug 12, 2026NCT07575308Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 12, 2026NCT06659640lastUpdatePostDate: changed
LOWAug 12, 2026NCT07575308Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 12, 2026NCT06659640lastUpdatePostDate: changed

Frequently asked questions about ALN-6400

What is ALN-6400?

ALN-6400 is an investigational small molecule drug being developed by Alnylam Pharmaceuticals for rare bleeding disorders. It is being studied in hereditary hemorrhagic telangiectasia and von Willebrand disease, including heavy menstrual bleeding associated with VWD. It remains in clinical development and is not approved for any indication.

What does ALN-6400 target?

ALN-6400 targets plasminogen. By acting on plasminogen, the drug is designed to influence the fibrinolytic pathway involved in bleeding. This mechanism is being explored in conditions where abnormal blood vessel structure or clotting protein deficiency leads to excessive or recurrent bleeding.

Who makes ALN-6400?

ALN-6400 is being developed by Alnylam Pharmaceuticals, Inc., which trades on the Nasdaq under the ticker ALNY. Alnylam is the sponsor of the clinical studies evaluating the drug in hereditary hemorrhagic telangiectasia and von Willebrand disease.

What phase is ALN-6400 in?

ALN-6400 is in clinical development. A Phase 1 study in healthy volunteers and patients with hereditary hemorrhagic telangiectasia has been conducted, and a Phase 2 study in von Willebrand disease with heavy menstrual bleeding is recruiting. The drug is investigational and has not been approved by the FDA.

What clinical trials is ALN-6400 in?

ALN-6400 has been studied in NCT06659640, a Phase 1 trial in healthy volunteers and patients with hereditary hemorrhagic telangiectasia across the United States, Australia, Canada, France, Germany and Spain. The Phase 2 HMBeacon trial, NCT07575308, is recruiting adult and adolescent female patients with von Willebrand disease and heavy menstrual bleeding in the United States, Netherlands, Sweden and the United Kingdom.

What is ALN-6400 used for in von Willebrand disease?

ALN-6400 is being evaluated for von Willebrand disease, specifically in female patients who also experience heavy menstrual bleeding. The Phase 2 HMBeacon study, NCT07575308, is a randomized, double-blind, placebo-controlled trial enrolling adult and adolescent female patients aged 16 years and older.