Trial to Evaluate ALN-CIDEB in Adults With Metabolic Dysfunction-Associated Steatotic Liver Disease (MASLD)

October 29, 2026 updated by: Regeneron Pharmaceuticals

A Phase 3, Randomized, Double-blind, Placebo-controlled Trial of ALN-CIDEB in Adults With Metabolic Dysfunction-Associated Steatotic Liver Disease (MASLD)

This study will test a Regeneron study drug called ALN-CIDEB to find out whether it may help treat a liver disease called metabolic dysfunction-associated steatohepatitis (MASH). MASH is more advanced stage of a broader liver disease, MASLD. MASLD is a liver condition caused by too much fat building up in the liver. This can lead to liver scarring and inflammation and can reduce the liver's ability to keep the body healthy. Cell death-inducing DFFA-like effector B (CIDEB) is a protein made by liver cells that helps the liver to store fat.

The study is looking at:

  • What side effects ALN-CIDEB might cause
  • How well ALN-CIDEB works to change liver fat, liver injury, and liver scarring
  • How ALN-CIDEB could affect the body and the liver, which can help researchers understand why ALN-CIDEB works better for some people than others

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

1500

Phase

  • Phase 3

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 Locations

  • United States
    • Texas
      • Georgetown, Texas, United States, 78628
        • Recruiting
        • Advanced Medical Trials

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

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Key Inclusion Criteria:

  1. Has a clinical diagnosis of MASLD, as defined in the protocol
  2. Has a liver stiffness measurement between 6 and 20 kilopascals (kPa), as measured by a FibroScan® scan during screening or within approximately 3 months of screening, as defined in the protocol

Key Exclusion Criteria:

  1. Has a known chronic liver disease other than MASLD, as determined by the investigator, as defined in the protocol
  2. Has prior or current suspected or known drug-induced liver injury within approximately 1 year prior to screening
  3. Has a history of liver transplantation, current placement on a liver transplant list, or Model for End-Stage Liver Disease (MELD) score >12
  4. Has a known history of alcohol or other substance abuse within the last year or at any time during screening based on investigator's discretion
  5. Has prior, current, or planned future use (during the treatment period) of a GLP-1 receptor agonist-based therapy or any medication approved for the treatment of MASH (eg, resmetirom) unless used at a generally stable dose and regimen since at least 3 months prior to screening visit and throughout the screening period with no change to the dose or regimen anticipated during the treatment period, as defined in the protocol
  6. Has evidence of uncontrolled human immunodeficiency virus (HIV) infection, hepatitis B virus (HBV) infection, or hepatitis C virus (HCV) infection during screening, as defined in the protocol

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: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: Placebo
Drug: Placebo

Administered per the protocol
Experimental: ALN-CIDEB Dose Level 1
Drug: ALN-CIDEB

Administered per the protocol
Experimental: ALN-CIDEB Dose Level 2
Drug: ALN-CIDEB

Administered per the protocol

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Occurrence of Treatment Emergent Adverse Events (TEAEs)
Time Frame: Through Week 64
Through Week 64
Severity of TEAEs
Time Frame: Through Week 64
Through Week 64

Secondary Outcome Measures

Outcome Measure
Time Frame
Change from Baseline in FibroScan Controlled Attenuation Parameter (CAP)
Time Frame: At Week 52
At Week 52
Change from Baseline in FibroScan Liver Stiffness Measurement (LSM) by Vibration Controlled Transient Elastography (VCTE)
Time Frame: At Week 52
At Week 52
Change from Baseline in Aspartate Aminotransferase (AST)
Time Frame: Through Week 64
Through Week 64
Change from Baseline in Alanine Aminotransferase (ALT)
Time Frame: Through Week 64
Through Week 64

Collaborators and Investigators

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

Sponsor

Regeneron Pharmaceuticals

Investigators

  • Study Director: Clinical Trial Management, Regeneron 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 (Actual)

October 28, 2026

Primary Completion (Estimated)

March 3, 2029

Study Completion (Estimated)

March 3, 2029

Study Registration Dates

First Submitted

September 28, 2026

First Submitted That Met QC Criteria

September 28, 2026

First Posted (Actual)

October 2, 2026

Study Record Updates

Last Update Posted (Actual)

November 2, 2026

Last Update Submitted That Met QC Criteria

October 29, 2026

Last Verified

October 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • ALN-CIDEB-MASLD-2604
  • 2026-526723-22-00 (Ctis)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

All Individual Patient Data (IPD) that underlie publicly available results will be considered for sharing.

IPD Sharing Time Frame

When Regeneron has:

  • received marketing authorization from major health authorities (e.g., FDA, European Medicines Agency (EMA), Pharmaceuticals and Medical Devices Agency (PMDA), etc.) for the product and indication or has globally discontinued development of the product for all indications on or after April 2020 and has no plans for future development
  • made the study results publicly available (e.g., scientific publication, scientific conference, clinical trial registry)
  • the legal authority to share the data, and
  • ensured the ability to protect participant privacy

IPD Sharing Access Criteria

Qualified researchers can submit a proposal for access to individual patient or aggregate level data from a Regeneron-sponsored clinical trial through Vivli. Regeneron's Independent Research Request Evaluation Criteria can be found at: https://www.regeneron.com/sites/default/files/Regeneron-External-Data-Sharing-Policy-and-Independent-Research-Request-Evaluation-Criteria.pdf

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF
  • ANALYTIC_CODE
  • CSR

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

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.

Subscribe