HMBeacon: A Phase 2 Study to Evaluate ALN-6400 in Adult and Adolescent Female Patients With VWD and HMB (HMBeacon)

May 12, 2026 updated by: Alnylam Pharmaceuticals

HMBeacon: A Phase 2, Randomized, Double-blind Study of the Safety, Tolerability, Efficacy, and Pharmacodynamics of Multiple Dose ALN-6400 in Adult and Adolescent Female Patients With Von Willebrand Disease (VWD) and Heavy Menstrual Bleeding (HMB)

The purpose of this study is to evaluate the safety, tolerability, efficacy, and pharmacodynamics (PD) of multiple doses of ALN-6400 in adult and adolescent patients with VWD and HMB

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

24

Phase

  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

  • United States
    • Florida
      • Miami, Florida, United States, 33024
        • Clinical Trial Site

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult

Accepts Healthy Volunteers

No

Description

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 upper limit of normal (ULN)
  • Has total bilirubin greater than 1.5×ULN (except for patients with Gilbert's syndrome)
  • Has an estimated glomerular filtration (eGFR) less than 30 mL/min/1.73m^2 at screening
  • Is not willing to comply with the contraceptive requirements during the study period
  • Used routine factor prophylaxis (greater than or equal to 1 infusion of factor per week over 12 weeks) within 4 weeks of screening or plans use for routine factor prophylaxis during the study
  • New placement of any hormonal or nonhormonal intrauterine device (IUD) or hormonal implants within 24 weeks of screening
  • Known current gynecological conditions causing abnormal uterine bleeding (including infection, fibroids, endometriosis, polycystic ovary syndrome, or dysplasia)

Note: other protocol defined inclusion / exclusion criteria apply

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: ALN-6400 (Treatment Group A)
Participants will be administered multiple doses of ALN-6400.
Drug: ALN-6400
ALN-6400 will be administered subcutaneously (SC).
Experimental: ALN-6400 (Treatment Group B)
Participants will be administered multiple doses of ALN-6400.
Drug: ALN-6400
ALN-6400 will be administered subcutaneously (SC).

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Frequency of Adverse Events
Time Frame: Up to Week 72
Up to Week 72

Secondary Outcome Measures

Outcome Measure
Time Frame
Change from Baseline in Plasminogen (PLG) Plasma Activity Levels
Time Frame: Screening and up to Week 72 postdose
Screening and up to Week 72 postdose
Change from Baseline in PLG Plasma Protein Levels
Time Frame: Screening and up to Week 72 postdose
Screening and up to Week 72 postdose
Change from Baseline in Menstrual Blood Loss Via Pictorial Blood Assessment Chart (PBAC)
Time Frame: Screening and up to Week 72 postdose
Screening and up to Week 72 postdose
Patient-reported Outcome (PRO) assessed by Patient Global Impression of Change (PGI-C) Score
Time Frame: Week 4 up to Week 72
Week 4 up to Week 72
Change from Baseline in PRO assessed by Patient Global Impression of Severity (PGI-S) Score
Time Frame: Baseline up to Week 72
Baseline up to Week 72

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Alnylam Pharmaceuticals

Investigators

  • Study Director: Medical Director, Alnylam Pharmaceuticals

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

May 22, 2026

Primary Completion (Estimated)

June 30, 2027

Study Completion (Estimated)

November 29, 2028

Study Registration Dates

First Submitted

May 4, 2026

First Submitted That Met QC Criteria

May 4, 2026

First Posted (Actual)

May 8, 2026

Study Record Updates

Last Update Posted (Actual)

May 14, 2026

Last Update Submitted That Met QC Criteria

May 12, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • ALN-6400-002
  • 2025-524967-19-00 (Ctis)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Phase 2-4:

Access to Anonymized individual participant data that support these results is made available 12 months after study completion and not less than 12 months after the product and indication have been approved in the United States (US) and/or the European Union (EU).

Data will be provided contingent upon the approval of a research proposal and the execution of a data sharing agreement. Requests for access to data can be submitted via the website www.vivli.org.

Drug and device information, study documents

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

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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