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Efimosfermin alfa

Phase 3

Non-alcoholic Fatty Liver Disease | Small molecule | Metabolic |GSK plc|Last Updated: Apr 16, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials4
Total Enrollment2,512
FDA Designations
No designations recorded
Clinical Trials (4)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07221188A Clinical Study to Investigate the Safety and Tolerability of Efimosfermin Alfa Injection in Participants With Known or Suspected F2- or F3-stage MASHPHASE3 RECRUITING 1,250Dec 12, 2025Mar 24, 2028Apr 16, 202643 United States
NCT07221227A Pivotal Clinical Study to Investigate Efimosfermin Alfa in Participants With Biopsy-confirmed F2- or F3-stage MASHPHASE3 RECRUITING 1,200Oct 24, 2025Dec 12, 2031Apr 16, 202649 United States
NCT07358546A Study of Efimosfermin Alfa in Adults With Hepatic ImpairmentPHASE1 RECRUITING 32Mar 13, 2026Oct 13, 2027Apr 13, 20263 United States
NCT07335198A Study to Evaluate the Safety, Tolerability, Pharmacokinetics and Immunogenicity of Efimosfermin Alfa Administered as a Single Dose to Healthy Participants of Chinese, Japanese, and White/European AncestryPHASE1 RECRUITING 30Mar 5, 2026Aug 17, 2026Mar 27, 20261 New Zealand
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Study Endpoints
Primary Endpoints
Number of participants with treatment-emergent adverse events (TEAEs) and TEAEs by severity
At Week 52
Number of participants with TEAEs leading to discontinuation and TEAEs leading to discontinuation by severity
At Week 52
Number of participants with Grade 3 and Grade 4 laboratory abnormalities
At Week 52
Proportion of participants experiencing improvement in fibrosis by >=1 stage and no worsening of steatohepatitis at Week 52
At Week 52

Proportion of participants experiencing improvement in fibrosis of greater than or equal to (\>=) 1 stage by MASH clinical research network (CRN) fibrosis scores and no worsening of steatohepatitis (defined as no increase in nonalcoholic fatty liver disease activity score \[NAS\] for ballooning, inflammation, or steatosis) at 52 weeks will be assessed. MASH CRN fibrosis score ranges from 0 to 4, higher score indicates greater severity. NAS score ranges from 0 to 8, higher score indicates worse disease activity.

Proportion of participants experiencing resolution of steatohepatitis reading and no worsening of MASH CRN fibrosis score at Week 52
At Week 52

Resolution of steatohepatitis is defined as absence of fatty liver disease or isolated or simple steatosis without steatohepatitis and a NAS of 0 or 1 for inflammation, 0 for ballooning, and any value for steatosis. NAS score ranges from 0 to 8, higher score indicates worse disease activity. MASH CRN fibrosis score ranges from 0 to 4, higher score indicates greater severity.

Time from randomization to an adjudicated composite liver-related clinical outcome
From Randomization (Day 1) to 48 months

Liver-related outcome will comprised of all-cause mortality; transplantation; occurrence of significant hepatic events.

Area under the serum drug concentration versus time curve from time zero to infinity (AUC[0-inf]) of efimosfermin alfa
Up to 90 Days
Maximum observed serum drug concentration (Cmax) of efimosfermin alfa
Up to 90 Days
Number of participants with Adverse Events (AEs), treatment related AEs and serious adverse events (SAEs)
Up to 90 days
Number of participants with clinically significant changes in hematology, chemistry and urinalysis parameters
Up to 90 days
Number of participants with clinically significant changes in 12 Lead electrocardiogram (ECG)
Up to 90 days
Number of participants with clinically significant changes in vital signs
Up to 90 days
Area under the serum drug concentration versus time curve from time zero to the time of the last quantifiable concentration (AUC[0-t]) of efimosfermin alfa
Up to 90 days
Area under the serum drug concentration versus time curve from time zero extrapolated to infinity (AUC[0-inf]) of efimosfermin alfa
Up to 90 days
Maximum observed serum drug concentration, determined directly from the serum concentration-time data (Cmax) of efimosfermin alfa
Up to 90 days
Secondary Endpoints
Absolute Change from Baseline in enhanced liver fibrosis (ELF) score
Baseline (Day 1) and up to Week 52
Percent Change from Baseline in ELF score
Baseline (Day 1) and up to Week 52
Number of participants achieving an improvement in ELF score greater than equal to 0.5
At Week 52
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Efimosfermin Alfa Dose Level 1EXPERIMENTALParticipants randomized to this group will receive Efimosfermin Alfa at dose level 1
Efimosfermin Alfa Dose Level 2EXPERIMENTALParticipants randomized to this group will receive Efimosfermin Alfa at dose level 2
PlaceboPLACEBO_COMPARATORParticipants randomized to this group will receive Placebo
Participants receiving dose level 1 of efimosfermin alfaEXPERIMENTAL -
Participants receiving dose level 2 of efimosfermin alfaEXPERIMENTAL -
Participants receiving PlaceboPLACEBO_COMPARATOR -
Efimosfermin alfa in participants with moderate hepatic impairment due to MASH without alcoholEXPERIMENTALAll participants will receive efimosfermin alfa. Participants will have moderate hepatic impairment (Child-Pugh B) due to Metabolic Dysfunction-Associated Steatohepatitis (MASH) with typical alcohol consumption threshold in the 3 months prior to Screening of less than (\<) 5 standard drinks on any day and \<15 standard drinks per week for men; or \<4 standard drinks on any day and \<8 standard drinks per week for women.
Efimosfermin alfa in participants with moderate hepatic impairment due to MASH with alcoholEXPERIMENTALAll participants will receive efimosfermin alfa. Participants will have moderate hepatic impairment (Child-Pugh B) due to MASH with typical alcohol consumption threshold in the 3 months prior to Screening of greater than or equal to (\>=) 5 standard drinks per day or \>=15 standard drinks per week for men; or \>= 4 standard drinks per day or \>=8 or more drinks per week for women.
Efimosfermin alfa in severe hepatic impairment participants due to MASH regardless of alcohol useEXPERIMENTALAll participants will receive efimosfermin alfa. Participants will have severe hepatic impairment (Child-Pugh C) due to MASH with any typical daily alcohol consumption.
Efimosfermin alfa in participants of Chinese AncestryEXPERIMENTALHealthy participants of Chinese ancestry will be randomized to receive efimosfermin alfa.
Efimosfermin alfa in participants of Japanese AncestryEXPERIMENTALHealthy participants of Japanese ancestry will be randomized to receive efimosfermin alfa.
Efimosfermin alfa in participants of White/European AncestryEXPERIMENTALHealthy participants of White/European ancestry will be randomized to receive efimosfermin alfa
Placebo in participants of Chinese AncestryPLACEBO_COMPARATORHealthy participants of Chinese ancestry will be randomized to receive Placebo.
Placebo in participants of Japanese AncestryPLACEBO_COMPARATORHealthy participants of Japanese ancestry will be randomized to receive Placebo.
Placebo in participants of White/European AncestryPLACEBO_COMPARATORHealthy participants of White/European ancestry will be randomized to receive Placebo.
Interventions
NameTypeDescription
Efimosfermin AlfaDRUGEfimosfermin Alfa will be administered
PlaceboDRUGPlacebo will be administered
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Eligibility Criteria
Age Range18 Years — 75 Years
SexALL
Healthy VolunteersNo
Study Sites43

Inclusion Criteria: * Able and willing to understand and sign a written informed consent form (ICF) that must be obtained prior to the initiation of study procedures * Age \>=18 through \<=75 years at enrolment * History or presence of 2 or more of the 5 components of metabolic syndrome per America...

Countries:United StatesNew Zealand
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT07358546Status: NOT_YET_RECRUITING → RECRUITING
MEDIUMMay 26, 2026NCT07335198Status: NOT_YET_RECRUITING → RECRUITING
LOWMay 26, 2026NCT07221227primaryCompletionDate: changed
LOWMay 26, 2026NCT07221188primaryCompletionDate: changed
LOWMay 24, 2026NCT07221227studyFirstPostDate: changed
LOWMay 24, 2026NCT07221188studyFirstPostDate: changed
LOWMay 24, 2026NCT07358546studyFirstPostDate: changed
LOWMay 24, 2026NCT07335198studyFirstPostDate: changed