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Pegozafermin

Phase 3

Metabolic Dysfunction-Associated Steatohepatitis (MASH) / Nonalcoholic Steatohepatitis (NASH) With Compensated Cirrhosis | Monoclonal antibody | Metabolic |89bio, Inc.|Last Updated: Jul 13, 2026

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment762

FDA Designations

BREAKTHROUGH_THERAPY

Clinical trial landscape

Pegozafermin · 5 trials · 4 indications

Phase 3 3Phase 2 1Phase 1 1
NCT06419374A Study to Evaluate the Efficacy and Safety of Pegozafermin in Participants With Compensated Cirrhosis Due to MASHMetabolic Dysfunction-Associated Steatohepatitis (MASH) / Nonalcoholic Steatohepatitis (NASH) With Compensated Cirrhosis
RECRUITING762 Analytics
NCT06318169A Study Evaluating the Efficacy and Safety of Pegozafermin in Participants With MASH and Fibrosis (ENLIGHTEN-Fibrosis)Metabolic Dysfunction-Associated Steatotic Liver Disease (MASH) / Nonalcoholic Steatohepatitis (NASH) With Fibrosis
RECRUITING1,350 Analytics
NCT05852431To Evaluate the Efficacy and Safety of Pegozafermin in Subjects With Severe HypertriglyceridemiaSevere Hypertriglyceridemia
COMPLETED369 Analytics
PHASE3RECRUITING
A Study to Evaluate the Efficacy and Safety of Pegozafermin in Participants With Compensated Cirrhosis Due to MASH
Metabolic Dysfunction-Associated Steatohepatitis (MASH) / Nonalcoholic Steatohepatitis (NASH) With Compensated CirrhosisUnlock trial analytics
PHASE3RECRUITING
A Study Evaluating the Efficacy and Safety of Pegozafermin in Participants With MASH and Fibrosis (ENLIGHTEN-Fibrosis)
Metabolic Dysfunction-Associated Steatotic Liver Disease (MASH) / Nonalcoholic Steatohepatitis (NASH) With FibrosisUnlock trial analytics
PHASE3COMPLETED
To Evaluate the Efficacy and Safety of Pegozafermin in Subjects With Severe Hypertriglyceridemia
Severe HypertriglyceridemiaUnlock trial analytics

Study Endpoints

Primary Endpoints

Proportion of Participants Achieving Fibrosis Regression
Baseline through Month 24

Fibrosis regression is defined as improvement in fibrosis by ≥1 stage, at Month 24 biopsy relative to baseline biopsy.

Time to First Occurrence of Disease Progression as Measured by Composite of Protocol -Specified Clinical Events
Baseline up to 5 years
Number of Participants With at Least an Improvement of Fibrosis ≥1 Stage Without Worsening of Steatohepatitis at Week 52
Week 52

Worsening of steatohepatitis is defined as increase in non-alcoholic fatty liver disease (NAFLD) Activity Score (NAS) for ballooning, inflammation, or steatosis

Number of Participants With Resolution of Steatohepatitis Without Worsening of Fibrosis at Week 52
Week 52

Resolution of steatohepatitis is defined as total absence of ballooning (score=0) and absent or mild inflammation (score 0 to 1). Worsening of fibrosis is defined as progression of fibrosis by ≥1 stage.

Time to First Occurrence of Disease Progression
Up to 5 years

Final analysis of the time to first occurrence of disease progression will be measured by a composite of protocol-specified clinical events

Percent change from baseline in fasting TG
26 weeks
Percent Change From Baseline to Week 8 in Serum Triglyceride (TG)
Baseline, Week 8
Part 1: Number of Participants With Treatment-emergent Adverse Event (TEAEs)
Up to 113 days

An adverse event (AE) was any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. TEAEs were defined as AEs occurring at or after the first dose date and time, through study termination, or existing prior to the time of and worsening after the time of the first dose of investigational product. A summary of other non-serious AEs and all serious AEs, regardless of causality is located in Reported AE section.

Part 2: Number of Participants With TEAEs
Up to 162 days

An AE was any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. TEAEs were defined as AEs occurring at or after the first dose date and time, through study termination, or existing prior to the time of and worsening after the time of the first dose of investigational product. A summary of other non-serious AEs and all serious AEs, regardless of causality is located in Reported AE section.

Part 1: Maximum Observed Serum Concentration (Cmax) of Pegozafermin
Predose and up to 168 hours postdose on Day 29
Part 1: Area Under the Serum Concentration Versus Time Curve From Time Zero to the Last Measurable Concentration (AUClast) of Pegozafermin
Predose and up to 168 hours postdose on Day 29
Part 1: Time to Peak Serum Concentration (Tmax) of Pegozafermin
Predose and up to 168 hours postdose on Day 29
Part 1: Terminal Elimination Half-life (t1/2) of Pegozafermin
Predose and up to 168 hours postdose on Day 29
Part 2: Number of Participants With at Least a 2-point Improvement in NAFLD Activity Score (NAS) With at Least a 1-point Improvement in Ballooning or Lobular Inflammation, and no Worsening of Fibrosis
Day 141

NAS was the sum of the scores of steatosis, inflammation, and ballooning. NAS score ranges from of 0 to 8, with higher scores indicating worse disease severity. Worsening of fibrosis was defined as progression of fibrosis ≥1 stage in NASH Clinical Research Network (CRN) fibrosis score. NASH CRN Fibrosis is staged on a 0-4 scale: 0 (none); 1 (perisinusoidal or periportal fibrosis); 2 (perisinusoidal and portal/periportal fibrosis); 3 (bridging fibrosis); 4 (cirrhosis).

Secondary Endpoints

Change from Baseline in Enhanced Liver Fibrosis (ELF) Score
Baseline, up to Month 60
Change from Baseline in Alanine Aminotransferase (ALT) Level
Baseline, up to Month 60
Change from Baseline in FibroScan Vibration-controlled Transient Elastography (VCTE)
Baseline, up to Month 60
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
PegozaferminEXPERIMENTAL -
PlaceboPLACEBO_COMPARATORMatched placebo
Pegozafermin Regimen 1EXPERIMENTAL -
Pegozafermin Regimen 2EXPERIMENTAL -
Pegozafermin - 30mg once a weekEXPERIMENTAL -
Pegozafermin - 20mg once a weekEXPERIMENTAL -
Placebo once a weekPLACEBO_COMPARATOR -
Pegozafermin 9 mg QWEXPERIMENTALParticipants received pegozafermin 9 mg QW as an SC injection for 8 weeks in the Main Study cohort.
Pegozafermin 18 mg QWEXPERIMENTALParticipants received pegozafermin 18 mg QW as an SC injection for 8 weeks in the Main Study cohort.
Pegozafermin 27 mg QWEXPERIMENTALParticipants received pegozafermin 27 mg QW as an SC injection for 8 weeks in the Main Study cohort or Fibrate Expansion cohort. Main Study and Fibrate Expansion pegozafermin 27 mg QW groups were pooled together due to low sample size in the expansion cohort.
Pegozafermin 36 mg Q2WEXPERIMENTALParticipants received pegozafermin 36 mg Q2W as an SC injection for 8 weeks in the Main Study cohort.
Part 1: Pegozafermin 3 milligrams (mg) weekly (QW)EXPERIMENTALParticipants were administered 3 mg of pegozafermin QW, via subcutaneous (SC) injection, starting on Day 1 through Day 85.
Part 1: Pegozafermin 9 mg QWEXPERIMENTALParticipants were administered 9 mg of pegozafermin QW, via SC injection, starting on Day 1 through Day 85.
Part 1: Pegozafermin 18 mg QWEXPERIMENTALParticipants were administered 18 mg of pegozafermin QW, via SC injection, starting on Day 1 through Day 85.
Part 1: Pegozafermin 27 mg QWEXPERIMENTALParticipants were administered 27 mg of pegozafermin QW, via SC injection, starting on Day 1 through Day 85.
Part 1: Pegozafermin 18 mg Every 2 Weeks (Q2W)EXPERIMENTALParticipants were administered 18 mg of pegozafermin Q2W, via SC injection, starting on Day 1 through Day 85.
Part 1: Pegozafermin 36 mg Q2WEXPERIMENTALParticipants were administered 36 mg of pegozafermin Q2W, via SC injection, starting on Day 1 through Day 85.
Part 1: Placebo QW or Q2WPLACEBO_COMPARATORParticipants were administered placebo matching to pegozafermin QW or Q2W, via SC injection, starting on Day 1 through Day 85.
Part 2: Pegozafermin 27 mg QWEXPERIMENTALParticipants were administered 27 mg of pegozafermin QW, via SC injection, starting on Day 1 through Day 134.

Interventions

NameTypeDescription
PegozaferminBIOLOGICALSubcutaneous injection
PlaceboDRUGSubcutaneous injection
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites317

Key Inclusion Criteria: * Males or non-pregnant females aged between 18 and 75 years (inclusive) at time of signing the informed consent form (ICF). * Participants must have type 2 diabetes mellitus diagnosed at least 3 months before screening or at least 2 metabolic risk factors. * Biopsy-confirme...

Countries:United StatesArgentinaAustraliaBelgiumBrazilBulgariaCanadaFranceGermanyHong KongHungaryIndiaIsraelItalyMexicoNetherlandsPolandPuerto RicoSingaporeSouth KoreaSpainTaiwanTurkey (Türkiye)United KingdomAustriaCzechiaGeorgiaJapanSouth AfricaChileLatvia
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Recent Changes (Last 90 Days)

LOWJul 13, 2026NCT06318169lastUpdatePostDate: changed
LOWJul 13, 2026NCT06419374lastUpdatePostDate: changed
LOWJul 13, 2026NCT06318169lastUpdatePostDate: changed
LOWJul 13, 2026NCT06419374lastUpdatePostDate: changed
LOWJul 8, 2026NCT06318169lastUpdatePostDate: changed
LOWJul 8, 2026NCT06419374lastUpdatePostDate: changed
LOWJul 8, 2026NCT06318169lastUpdatePostDate: changed
LOWJul 8, 2026NCT06419374lastUpdatePostDate: changed
LOWJul 7, 2026NCT05852431lastUpdatePostDate: changed
LOWJul 7, 2026NCT05852431lastUpdatePostDate: changed
HIGHJun 18, 2026NCT05852431Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 18, 2026NCT05852431Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 18, 2026NCT05852431Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 18, 2026NCT05852431Status: ACTIVE_NOT_RECRUITING → COMPLETED
LOWJun 4, 2026NCT06419374lastUpdatePostDate: changed
LOWJun 4, 2026NCT06318169lastUpdatePostDate: changed
LOWJun 4, 2026NCT06419374lastUpdatePostDate: changed
LOWJun 4, 2026NCT06318169lastUpdatePostDate: changed
LOWJun 4, 2026NCT06419374lastUpdatePostDate: changed
LOWJun 4, 2026NCT06318169lastUpdatePostDate: changed

Frequently asked questions about Pegozafermin

What is Pegozafermin used for?

Pegozafermin is an investigational drug being developed for Metabolic Dysfunction-Associated Steatotic Liver Disease (MASH) / Nonalcoholic Steatohepatitis (NASH) with fibrosis, MASH/NASH with compensated cirrhosis, NASH, and severe hypertriglyceridemia. It is currently in Phase 3 clinical trials for these metabolic conditions.

What does Pegozafermin target?

Pegozafermin is a monoclonal antibody being developed by 89bio, Inc. (NASDAQ: ETNB) for metabolic diseases. It is being studied in Phase 3 trials for MASH/NASH with fibrosis and compensated cirrhosis, as well as severe hypertriglyceridemia.

Who makes Pegozafermin?

Pegozafermin is being developed by 89bio, Inc., a biopharmaceutical company traded on NASDAQ under the ticker ETNB. The company is conducting Phase 3 clinical trials for the drug in MASH/NASH with fibrosis and compensated cirrhosis.

What phase is Pegozafermin in?

Pegozafermin is in Phase 3 clinical development. It has received Breakthrough Therapy designation from the FDA. It is not yet approved and remains investigational, with ongoing trials in MASH/NASH with fibrosis and compensated cirrhosis.

What clinical trials is Pegozafermin in?

Pegozafermin is being studied in two Phase 3 trials: NCT06318169 (ENLIGHTEN-Fibrosis) in MASH with fibrosis, enrolling 1350 participants, and NCT06419374 in compensated cirrhosis due to MASH, enrolling 762 participants. Both are recruiting and placebo-controlled.

Is Pegozafermin the same as BIO89-100?

Yes, Pegozafermin is also known as BIO89-100. A Phase 2 trial (NCT04541186) evaluated BIO89-100 in participants with severe hypertriglyceridemia, and a Phase 1 trial (NCT04048135) studied it in NASH or NAFLD.