IMPACT TRIAL: Efficacy and Safety of Pemvidutide in Subjects With Nonalcoholic Steatohepatitis (NASH)

Last updated: December 24, 2025
Sponsor: Altimmune, Inc.
Overall Status: Completed

Phase

2

Condition

Liver Disease

Treatment

Placebo

Pemvidutide

Clinical Study ID

NCT05989711
ALT- 801-203
  • Ages 18-75
  • All Genders

Study Summary

Purpose of this study is to assess the effects of pemvidutide on NASH resolution and NASH fibrosis.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  1. Written informed consent

  2. Male or female 18-75 years

  3. Histologic diagnosis of NASH and/or histologic confirmation of NASH based on centralpathology evaluation of a liver biopsy during screening

  4. A histologic NAFLD Activity Score (NAS) ≥ 4 with a score of at least 1 on eachsubcomponent score based on central pathology evaluation (steatosis [0-3],lobular inflammation [0-3], and hepatocyte ballooning [0-2])

  5. NASH fibrosis stages 2 through 3 according to the NASH CRN fibrosis stagingsystem based on central pathology evaluation

  6. Subject agrees to have a liver biopsy performed during the screening period (if nobiopsy within the preceding 6 months is available) and at 24 weeks of treatment

  7. BMI ≥ 27.0 kg/m2

  8. Subjects with Type 2 diabetes mellitus (T2D) should be on a stable treatment regimenfor their T2D for at least 90 days prior to screening

  9. Subject meets at least 3 of the 5 criteria of Metabolic Syndrome (American HeartAssociation 2005)

  10. Liver fat content by MRI-PDFF ≥ 8%

Exclusion

Exclusion Criteria:

  1. Weight gain or loss > 5% in the 3 months prior to randomization or > 10% in the 6months prior to screening

  2. History or clinical evidence of Type 1 diabetes mellitus

  3. Hemoglobin A1c (HbA1c) > 9.5% or clinically significant persistent hyperglycemia

  4. Liver conditions:

  5. History of cirrhosis or complications of cirrhosis, including but not limitedto variceal bleeding, encephalopathy, or ascites

  6. Documented causes of chronic liver disease other than NASH

  7. ALT or AST laboratory values > 5 × ULN

Study Design

Total Participants: 212
Treatment Group(s): 2
Primary Treatment: Placebo
Phase: 2
Study Start date:
July 27, 2023
Estimated Completion Date:
November 25, 2025

Study Description

A Phase 2, multi-center, double-blind, placebo-controlled study to evaluate the efficacy and safety of pemvidutide in NASH.

Connect with a study center

  • Royal Prince Alfred Hospital

    Camperdown, New South Wales 2050
    Australia

    Site Not Available

  • Concord Repatriation General Hospital

    Concord, New South Wales 2139
    Australia

    Site Not Available

  • Liverpool Hospital

    Liverpool, New South Wales 2170
    Australia

    Site Not Available

  • Royal Prince Alfred Hospital

    Camperdown 2172563, New South Wales 2155400 2050
    Australia

    Site Not Available

  • Liverpool Hospital

    Liverpool 2159851, New South Wales 2155400 2170
    Australia

    Site Not Available

  • Princess Alexandra Hospital/ Translational Research Institute

    Woolloongabba, Queensland 4102
    Australia

    Site Not Available

  • Princess Alexandra Hospital/ Translational Research Institute

    Woolloongabba 6943568, Queensland 2152274 4102
    Australia

    Site Not Available

  • Flinders Medical Centre

    Bedford Park, South Australia 5042
    Australia

    Site Not Available

  • Flinders Medical Centre

    Bedford Park 2076918, South Australia 2061327 5042
    Australia

    Site Not Available

  • St. Vincent's Hospital Melbourne

    Fitzroy, Victoria 3065
    Australia

    Site Not Available

  • Austin Health

    Heidelberg, Victoria 3084
    Australia

    Site Not Available

  • St. Vincent's Hospital Melbourne

    Fitzroy 2166584, Victoria 2145234 3065
    Australia

    Site Not Available

  • Austin Health

    Heidelberg 2163654, Victoria 2145234 3084
    Australia

    Site Not Available

  • Box Hill Hospital

    Box Hill, Victory 3128
    Australia

    Site Not Available

  • Box Hill Hospital

    Box Hill 2174360, Victory 3128
    Australia

    Site Not Available

  • Monash Hospital

    Clayton, Victory 3168
    Australia

    Site Not Available

  • Monash Hospital

    Clayton 2171400, Victory 3168
    Australia

    Site Not Available

  • Fiona Stanley Hospital

    Murdoch, Western Australia 6150
    Australia

    Site Not Available

  • Sir Charles Gairdner Hospital

    Nedlands, Western Australia 6009
    Australia

    Site Not Available

  • Fiona Stanley Hospital

    Murdoch 8349091, Western Australia 2058645 6150
    Australia

    Site Not Available

  • Sir Charles Gairdner Hospital

    Nedlands 2064874, Western Australia 2058645 6009
    Australia

    Site Not Available

  • Altimmune Clinical Study Site

    San Juan, 00901
    Puerto Rico

    Site Not Available

  • Altimmune Clinical Study Site

    San Juan 4568127, 00901
    Puerto Rico

    Site Not Available

  • Altimmune Clinical Study Site

    Chandler, Arizona 85224
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Peoria, Arizona 85345
    United States

    Site Not Available

  • Altimmune Clinial Study Site

    Tucson, Arizona 85704
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Tucson, Arizona 85701
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Chandler 5289282, Arizona 5551752 85224
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Peoria 5308480, Arizona 5551752 85345
    United States

    Site Not Available

  • Altimmune Clinial Study Site

    Tucson 5318313, Arizona 5551752 85704
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Tucson 5318313, Arizona 5551752 85701
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    North Hollywood, California 33019
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Panorama City, California 91402
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    North Hollywood 5377654, California 5332921 33019
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Panorama City 5380932, California 5332921 91402
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Englewood, Colorado 80110
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Englewood 5421250, Colorado 5417618 80110
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Bradenton, Florida 34201
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Fort Myers, Florida 33912
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Hialeah Gardens, Florida 33018
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Miami Lakes, Florida 33014
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Port Orange, Florida 32123
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Sarasota, Florida 34240
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    West Palm Beach, Florida 33401
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Bradenton 4148708, Florida 4155751 34201
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Fort Myers 4155995, Florida 4155751 33912
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Hialeah Gardens 4158482, Florida 4155751 33018
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Miami Lakes 4164186, Florida 4155751 33014
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Port Orange 4169156, Florida 4155751 32123
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Sarasota 4172131, Florida 4155751 34240
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    West Palm Beach 4177887, Florida 4155751 33401
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Dalton, Georgia 30720
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Marietta, Georgia 30006
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Dalton 4190581, Georgia 4197000 30720
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Marietta 4207783, Georgia 4197000 30006
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Bastrop, Louisiana 78602
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Shreveport, Louisiana 71101
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Bastrop 4315535, Louisiana 4331987 78602
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Shreveport 4341513, Louisiana 4331987 71101
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Clarksville, Tennessee 37040
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Germantown, Tennessee 38138
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Clarksville 4613868, Tennessee 4662168 37040
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Germantown 4624601, Tennessee 4662168 38138
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Austin, Texas 73301
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Bellaire, Texas 77401
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Edinburg, Texas 78540
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Georgetown, Texas 78626
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Houston, Texas 77036
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    San Antonio, Texas 78201
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Austin 4671654, Texas 4736286 73301
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Bellaire 4673353, Texas 4736286 77401
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Edinburg 4688275, Texas 4736286 78540
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Georgetown 4693342, Texas 4736286 78626
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    Houston 4699066, Texas 4736286 77036
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    San Antonio 4726206, Texas 4736286 78201
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    West Jordan, Utah 84081
    United States

    Site Not Available

  • Altimmune Clinical Study Site

    West Jordan 5784549, Utah 5549030 84081
    United States

    Site Not Available

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