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IMA203 Product

Phase 1

Refractory Cancer | Monoclonal antibody | Oncology |Immatics N.V.|Last Updated: May 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
CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment375
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT03686124ACTengine® IMA203/IMA203CD8 as Monotherapy or in Combination With Nivolumab in Recurrent and/or Refractory Solid TumorsPHASE1 RECRUITING 375May 14, 2019Jun 1, 2032May 13, 202621 United States, Germany
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Study Endpoints
Primary Endpoints
Phase 1: Determine the MTD and/or recommended dose for extension for IMA203/IMA203CD8
28 days

Number of patients with dose-limiting toxicities (DLTs)

Phase 1 and Phase 2: Number and grade of treatment emergent adverse events and adverse events of special interest in subjects treated.
35 days

Treatment emergent adverse events (TEAEs), Adverse events of special interest (AESIs) and Treatment-emergent serious adverse events (TESAEs).

Phase 1 and Phase 2: Tumor Response
5 years

Objective response rate (ORR) based on best overall response (BOR) of complete response (CR) and partial response (PR) centrally assessed (by a BICR1) using RECIST1.1

Secondary Endpoints
Phase 1 and 2: Persistence of TCR engineered T-cells
up to 5 years post treatment
Phase 1 and 2: Tumor response
up to 5 years
Phase 2: Patient reported quality of life
up to 5 years
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Dose Escalation A (closed to enrollment)EXPERIMENTALDose escalation of IMA203
Extension Cohort AEXPERIMENTALIMA203 at RP2D
Extension Cohort B (closed to enrollment)EXPERIMENTALIMA203 at RP2D + nivolumab
Extension Cohort AAEXPERIMENTALIMA203 at final RP2D (flat dose)
Uveal MelanomaEXPERIMENTALIMA203 at RP2D
Dose Escalation BEXPERIMENTALDose escalation of IMA203CD8
Extension Cohort CEXPERIMENTALIMA203CD8 at dose levels confirmed to be safe
Extension Cohort DEXPERIMENTALIMA203CD8 at dose levels confirmed to be safe; without IL-2
OvarianEXPERIMENTALIMA203CD8 monotherapy at dose levels confirmed to be safe
EndometrialEXPERIMENTALIMA203CD8 monotherapy at dose levels confirmed to be safe
Head and Neck, Lung, and Triple Negative Breast CancerEXPERIMENTALIMA203CD8 monotherapy at dose levels confirmed to be safe
Rare CancersEXPERIMENTALIMA203CD8 monotherapy at dose levels confirmed to be safe
Interventions
NameTypeDescription
IMA203 ProductBIOLOGICALThe cell dose will be based on viable CD3+CD8+ HLA- Dextramer+ cells per body surface area (BSA) as defined by the Mosteller formula
IMA203 product- flat doseBIOLOGICALThe cell dose will be based on viable CD3+CD8+ HLA- Dextramer+ cells
IMA203CD8 ProductBIOLOGICALThe cell dose will be based on viable CD3+CD8+ HLA- Dextramer+ cells per body surface area (BSA) as defined by the Mosteller formula
NivolumabDRUGNivolumab will be given post IMA203/IMA203CD8 infusion, after hematologic recovery is achieved. Clinical supply provided by Bristol Myers Squibb.
IMADetect®DEVICEIMADetect® is developed as a companion diagnostic to aid in selecting patients with relapsed and/or refractory solid cancers who might be eligible for enrollment in Immatics clinical trials.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites21

Inclusion Criteria: * Patients must have recurrent/progressing and/or refractory solid tumors and must have received or not be eligible for all available indicated standard of care treatment. * Eastern Cooperative Oncology Group (ECOG) performance status 0-1 * HLA-A\*02:01 positive * For patients w...

Countries:United StatesGermany
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT03686124primaryCompletionDate: changed
LOWMay 24, 2026NCT03686124studyFirstPostDate: changed