A Study to Investigate the Safety and Efficacy of Efimosfermin Alfa Compared With Placebo in Adult Participants With Alcohol-related Liver Disease (ALD) (ALLSTAR)

November 11, 2026 updated by: GlaxoSmithKline

A Dose-finding, Double-blind, Randomized, Placebo-controlled Phase 2 Study to Evaluate the Efficacy and Safety of Treatment With Efimosfermin Alfa in Adult Participants With Alcohol-related Liver Disease (ALD)

This is a dose-ranging study to evaluate safety of efimosfermin alfa and to establish proof-of-concept that efimosfermin alfa therapy provides benefit in participants with ALD.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
274

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • 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

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

  • Argentina
      • Buenos Aires, Argentina, 1061
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Raul Adrover
      • CABA, Argentina, C1056ABI
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Maria Anders
      • Ciudad AutOnoma de Buenos Aire, Argentina, 1118
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Nora Cejas
      • Rosario, Argentina, S2002
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Juan Favareto
      • San Miguel de Tucumán, Argentina, T4000IHE
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Maria Daniela Pérez
  • Canada
    • Ontario
      • Toronto, Ontario, Canada, M1S 4T7
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Anshul Arora
  • South Korea
      • Pusan, South Korea, 49241
        • Recruiting
        • GSK Investigational Site
        • Principal Investigator:
          • Jeong Heo
        • Contact:
        • Contact:
      • Seoul, South Korea, 05505
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Won-Mook Choi
      • Seoul, South Korea, 135-710
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Dong Hyun Sinn
  • United States
    • Arizona
      • Chandler, Arizona, United States, 85224-4711
        • Recruiting
        • GSK Investigational Site
        • Principal Investigator:
          • Anita Kohli
        • Contact:
        • Contact:
    • Florida
      • Miami Lakes, Florida, United States, 33016
        • Recruiting
        • GSK Investigational Site
        • Principal Investigator:
          • William Sanchez
        • Contact:
        • Contact:
    • Kansas
      • Topeka, Kansas, United States, 66606
        • Recruiting
        • GSK Investigational Site
        • Principal Investigator:
          • Shekhar Challa
        • Contact:
        • Contact:
    • Texas
      • Fort Worth, Texas, United States, 76104
        • Recruiting
        • GSK Investigational Site
        • Contact:
        • Contact:
        • Principal Investigator:
          • Thomas Cotter
      • San Antonio, Texas, United States, 78215
        • Recruiting
        • GSK Investigational Site
        • Principal Investigator:
          • Eric Lawitz
        • Contact:
        • Contact:

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Participant must be 18 to 75 years of age inclusive, at the time of Screening.

  • Capable of giving signed informed consent prior to the performance of any study-specific procedures.

  • Able and willing to comply with all study assessments and adhere to the protocol schedule of activities.

  • History of heavy alcohol consumption for greater than 6 months at any time prior to Screening.

  • A female participant is eligible to participate if they are not pregnant or breastfeeding, and one of the following conditions applies:

    • Is a Participant of non-childbearing potential (PONCBP) OR
    • Is a Participant of childbearing potential (POCBP) and using a contraceptive method that is highly effective, with a failure rate of less than (<)1 percentage (%), 30 days prior to and during the study intervention period and for at least 16 weeks after the last dose of study intervention.

Exclusion Criteria:

  • Other primary causes of liver disease (e.g., viral hepatitis, primary biliary cholangitis, primary sclerosing cholangitis, autoimmune hepatitis, drug-induced hepatotoxicity, Wilson disease, hemochromatosis, alpha-1-antitryspin deficiency, etc.). Alcohol must be the primary cause of liver disease.

  • Co-infection with Hepatitis B virus (HBV), Hepatitis C virus (HCV), or Human immunodeficiency virus (HIV) as indicated from the central lab

  • History of diabetes mellitus (DM), either:

    • Type 1 DM
    • Type 2 DM with unstable glycemic control or with major complications.

  • History of malignancy of any organ system (other than localized basal cell carcinoma of the skin or in situ cervical cancer), treated or untreated, within the 3 years prior to Screening 1, regardless of any evidence of local recurrence or metastasis.

  • Current, or history of known hepatocellular carcinoma (HCC).

  • Any major surgery within 3 months prior to Screening 1 or planned during the study

  • Any surgical or medical condition that might jeopardize the individual's safety or compliance with study procedures in the opinion of the investigator.

  • All organ transplant recipients, except for history of corneal transplants, or current listing or active consideration for liver transplant during the Screening period.

  • Poorly controlled hypertension.

  • Evidence of Wernicke-Korsakoff syndrome or alcohol-related dementia.

  • Prior use of a Fibroblast growth factor 21 (FGF21) analogue, including efimosfermin, within the 6 months prior to Screening 1.

  • Individuals with a history of resmetirom use within 3 months prior to Day 1 are to be excluded.

  • Concomitant use of investigational drugs for Metabolic dysfunction-associated steatohepatitis (MASH) or ALD.

  • Current or planned participation in any clinical trial of investigational therapies or medical devices.

  • Exceeding pre-defined laboratory parameters for Triglycerides, Alanine Aminotransferase (ALT), Alkaline Phosphatase (ALP), International normalised ratio (INR), Albumin, Urine albumin-creatinine ratio (uACR) or Glycosylated Hemoglobin (HbA1c).

  • History of drug abuse within the 12 months prior to Day 1 or evidence of such abuse as indicated by laboratory assays conducted at Screening.

  • History of hypersensitivity (such as anaphylaxis or hepatotoxicity) to study intervention and/or its excipients, drugs of similar biological class, FGF21 protein analogs, Fc-fusion proteins, or other protein-based therapeutics.

  • Overt hepatic encephalopathy (West Haven grade >=2).

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: N/A
  • Interventional Model: Sequential Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Placebo Comparator: Placebo

Participants will receive placebo.
Drug: Placebo

Placebo will be administered.
Experimental: Efimosfermin alfa Dose Level 1

Participants will receive efimosfermin alfa dose level 1.
Drug: Efimosfermin alfa

Efimosfermin alfa will be administered.
Experimental: Efimosfermin alfa Dose Level 2

Participants will receive efimosfermin alfa dose level 2.
Drug: Efimosfermin alfa

Efimosfermin alfa will be administered.
Experimental: Efimosfermin alfa Dose Level 3

Participants will receive efimosfermin alfa dose level 3.
Drug: Efimosfermin alfa

Efimosfermin alfa will be administered.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Change from Baseline in vibration-controlled transient elastography-liver stiffness measurement (VCTE-LSM)
Time Frame: Baseline (Day 1) and up to Week 60

VCTE-LSM is a non-invasive test that uses vibration-controlled transient elastography to measure the stiffness of the liver in kilopascals (kPa)
Baseline (Day 1) and up to Week 60
Change from Baseline in model for end-stage liver disease (MELD) score
Time Frame: Baseline (Day 1) and up to Week 60

MELD is a scoring system for assessing the severity of chronic liver disease. MELD scores range between 6 and 40, with 40 being the most severe.
Baseline (Day 1) and up to Week 60

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Change from Baseline in a blood test that helps predict the risk of disease progression in liver disease
Time Frame: Baseline (Day 1) and up to Week 52
Baseline (Day 1) and up to Week 52
Trough Concentration at steady state (Ctrough,ss) following administration of efimosfermin alfa
Time Frame: Up to Week 56
Up to Week 56
Area Under the concentration-time Curve from Time 0 (pre-dose) to the last quantifiable concentration (AUC[0-t]) of efimosfermin alfa in the subset of participants with optional intensive pharmacokinetics (PK) sampling
Time Frame: Up to Week 4
Up to Week 4
Maximum observed drug concentration (Cmax) of efimosfermin alfa in the subset of participants with optional intensive PK sampling
Time Frame: Up to Week 4
Up to Week 4
Number of Participants with Anti-drug antibodies (ADA) against efimosfermin alfa
Time Frame: Up to Week 56
Up to Week 56
Number of participants with treatment-emergent adverse events (TEAEs) and TEAEs by severity
Time Frame: Up to Week 60
Up to Week 60
Number of participants with TEAEs leading to discontinuation and TEAEs leading to discontinuation by severity
Time Frame: Up to Week 60
Up to Week 60
Number of participants with Grade 3 and Grade 4 laboratory abnormalities
Time Frame: Up to Week 60
Up to Week 60
Number of participants with clinically significant changes in Vital signs
Time Frame: Up to Week 60
Up to Week 60
Number of participants with clinically significant changes in 12-lead electrocardiogram (ECG) findings
Time Frame: Up to Week 60
Up to Week 60
Change from Baseline in serum aspartate aminotransferase (AST) (International units per liter)
Time Frame: Baseline (Day 1) and up to Week 60

This is a measurement of the AST enzyme in the blood.
Baseline (Day 1) and up to Week 60

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
GlaxoSmithKline

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: GSK Clinical Trials, GlaxoSmithKline

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)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
August 31, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
August 11, 2028

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 14, 2030

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
August 21, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 21, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
August 27, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
November 12, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 11, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
November 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 306837
  • 2026-526391-23 (Other Identifier: EU CT Number)
  • 2026-526391-23 (Registry Identifier: CTIS (EU))

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Study Sponsor will assess requests from qualified researchers for anonymized individual patient-level data and related study documents. Data sharing is subject to certain criteria, conditions, and exceptions. For further information, refer to https://www.gsk-studyregister.com/gsk-patient-level-data-sharing-july2025.pdf

IPD Sharing Time Frame

Anonymized IPD will be made available within 6 months of publication of primary, key secondary and safety results for studies in product with approved indication(s) or asset(s) with development terminated across all indications.

IPD Sharing Access Criteria

Anonymized IPD is shared with researchers whose proposals are approved by an Independent Review Panel and after a Data Sharing Agreement is in place. Access is provided for an initial period of 12 months, but an extension may be granted, when justified, for up to 6 months.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF
  • 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.

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