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zetomipzomib

Phase 2

Autoimmune Hepatitis | Small molecule | Infectious Disease |Kezar Life Sciences, Inc.|Last Updated: Jan 13, 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_CONTROLLEDDMC
Total Trials1
Total Enrollment24
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05569759A Study of Zetomipzomib (KZR-616) in Patients With Autoimmune Hepatitis (PORTOLA)PHASE2 COMPLETED 24May 23, 2023Apr 30, 2025Jan 13, 202624 United States
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Study Endpoints
Primary Endpoints
Patients Who Achieved Complete Biochemical Response
Week 12, Week 16, Week 20, and Week 24

The number of patients who achieve complete biochemical response (CR), defined as normal ALT, AST, and IgG values (if IgG level is elevated at Baseline) with glucocorticoid dose not higher than starting dose (at Baseline), by Week 24 of the Double-Blind Treatment Period. Analyses were also conducted at Week 12, Week 16, and Week 20.

The Safety and Tolerability of Zetomipzomib
Baseline through end of study visit (DBTP, Week 28 and OLE, Up to Week 24)

Proportion of participants who experience AEs (adverse events) and SAEs (serious adverse events) during the double-blind treatment period (DBTP) and the open-label extension (OLE).

Proportion of Participants Experiencing a Disease Flare Among the Participants Who Achieved a CR During the Double-blind Treatment Period
Start of open-label extension (OLE) period through End of Study (EOS) up to OLE Week 25

Proportion of participants experiencing a disease flare among the participants who achieved a complete biochemical response (CR) during the double-blind treatment period.

Secondary Endpoints
Alanine Aminotransferase (ALT)
Weeks 12, 16, 20, and 24
Partial Response
Weeks 12, 16, 20, and 24
Time to Complete Response
Baseline through Week 24
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
zetomipzomib + standard-of-care (glucocorticoids)EXPERIMENTALInitial 30 mg dose of zetomipzomib, followed by weekly 60 mg doses of zetomipzomib, for the remaining 23 weeks of the treatment period.
placebo + standard-of-care (glucocorticoids)PLACEBO_COMPARATORInitial 30 mg dose of placebo (sterile water for injection), followed by weekly 60 mg doses of placebo, for the remaining 23 weeks of the treatment period.
zetomipzomib + standard-of care (glucocorticoids) open-label extension periodEXPERIMENTALInitial 30 mg dose of zetomipzomib at the open-label extension (OLE) Week 1 visit, followed by weekly doses of 60 mg of zetomipzomib, for up to a total of 24 additional weeks of treatment.
Interventions
NameTypeDescription
zetomipzomibDRUGSubcutaneous injection of zetomipzomib with a target dose of 60 mg weekly
placeboDRUGSubcutaneous injection of placebo
zetomipzomib in open-label extensionDRUGSubcutaneous injection of zetomipzomib with a target dose of 60 mg weekly
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites24

Key Inclusion Criteria for the Double-blind Treatment Period: * Must be aged ≥18 years. * Must have a clinical diagnosis of AIH and signs of active disease despite standard-of-care therapy for ≥3 months or disease flare after experiencing complete remission induced by standard-of-care treatment,...

Countries:United States
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