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Zanidatamab

Phase 3

Gastric Neoplasms | Small molecule | Oncology |Jazz Pharmaceuticals plc|Last Updated: May 19, 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
RandomizedACTIVE_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment920
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05152147A Study of Zanidatamab in Combination With Chemotherapy Plus or Minus Tislelizumab in Patients With HER2-positive Advanced or Metastatic Gastric and Esophageal CancersPHASE3 ACTIVE NOT_RECRUITING 920Dec 2, 2021Jul 31, 2027May 19, 2026227 Argentina, Australia +31
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Study Endpoints
Primary Endpoints
Progression-free survival (PFS) by BICR
Up to 2.5 years

The time from randomization to the date of documented disease progression (per Response Evaluation Criteria in Solid Tumors \[RECIST\] version 1.1) as assessed by blinded independent central review (BICR) or death from any cause

Overall survival
Up to 3.5 years

The time from randomization to death due to any cause

Secondary Endpoints
Confirmed objective response rate (ORR) by BICR
Up to 2.5 years
Duration of response (DOR) by BICR
Up to 2.5 years
PFS per Investigator assessment
Up to 2.5 years
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Arm AACTIVE_COMPARATORTrastuzumab (Herceptin®) plus physician's choice of capecitabine plus oxaliplatin (CAPOX) or 5-fluorouracil (5-FU) plus cisplatin (FP)
Arm BEXPERIMENTALZanidatamab plus physician's choice of CAPOX or FP
Arm CEXPERIMENTALZanidatamab and tislelizumab plus physician's choice of CAPOX or FP
Interventions
NameTypeDescription
ZanidatamabDRUGAdministered IV
TislelizumabDRUGAdministered IV
TrastuzumabDRUGAdministered intravenously (IV)
CapecitabineDRUGAdministered orally (PO bid)
OxaliplatinDRUGAdministered IV
CisplatinDRUGAdministered IV
5-FluorouracilDRUGAdministered IV
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites227

Inclusion Criteria: * Histologically confirmed unresectable locally advanced, recurrent or metastatic HER2-positive gastroesophageal adenocarcinoma (adenocarcinomas of the stomach or esophagus, including the gastroesophageal junction), defined as 3+ HER2 expression by IHC or 2+ HER2 expression by I...

Countries:ArgentinaAustraliaBelgiumBrazilCanadaChileChinaEstoniaFranceGeorgiaGermanyGreeceGuatemalaIndiaIrelandItalyJapanMalaysiaMexicoNetherlandsPolandPortugalRomaniaSerbiaSingaporeSouth AfricaSouth KoreaSpainTaiwanThailandTurkey (Türkiye)UkraineUnited Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT05152147primaryCompletionDate: changed
LOWMay 24, 2026NCT05152147studyFirstPostDate: changed