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IMA203

Phase 3

Melanoma, Cutaneous Malignant | Monoclonal antibody | Oncology |Immatics N.V.|Last Updated: Jun 10, 2026

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Trial Design
RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment360
FDA Designations
RMAT
Clinical trial landscape

IMA203 · 2 trials · 3 indications

Phase 3 1Phase 1 1
NCT06743126SUPRAME-ACTengine® IMA203 vs. Investigator's Choice of Treatment in Previously Treated, Unresectable or Metastatic Cutaneous MelanomaMelanoma, Cutaneous Malignant
RECRUITING360 Analytics
PHASE3RECRUITING
SUPRAME-ACTengine® IMA203 vs. Investigator's Choice of Treatment in Previously Treated, Unresectable or Metastatic Cutaneous Melanoma
Melanoma, Cutaneous MalignantUnlock trial analytics
Study Endpoints
Primary Endpoints
Progression-free survival assessed by BICR
up to 5 years post first treatment of last patient

progression-free survival (PFS), centrally assessed (by blinded independent central review) using RECIST 1.1

Number of participants with dose-limiting toxicities (DLTs)
one year post infusion of IMA203

Number of DLTs will be used to determine the maximum tolerated dose (MTD) and/or recommended dose for extension (RDE) after treatment with IMA203 product in combination with mRNA-4203

Number of treatment emergent adverse events (AEs), AEs of special interest, serious AEs (SAEs), changes in laboratory parameters and vital signs, and frequency of dose interruptions, reductions and discontinuations
one year post infusion of IMA203

Used to evaluate safety and tolerability of treatment with IMA203 in combination with mRNA-4203

Secondary Endpoints
Overall survival (OS)
up to 5 years post first treatment of last patient
Objective response rate (ORR)
up to 5 years post first treatment of last patient
Progression-free survival
up to 5 years post first treatment of last patient
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Experimental armEXPERIMENTALNon-myeloablative chemotherapy for lymphodepletion (LD) over 4 days using fludarabine (FLU) and cyclophosphamide (CY), one-time administration of IMA203, and adjunctive therapy with low dose interleukin (IL)-2 for up to 10 days, starting approximately 24 h after IMA203 infusion, optional bridging therapy
Control arm- investigator's choiceACTIVE_COMPARATORInvestigator's choice of treatment approved by the respective Competent Authority (nivolumab plus relatlimab \[Opdualag®\], lifileucel, nivolumab, pembrolizumab, ipilimumab, or chemotherapy \[e.g., dacarbazine, temozolomide, paclitaxel, alb-bound paclitaxel, or paclitaxel plus carboplatin\]) as determined by the site investigator in accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC), optional bridging therapy.
IMA203 with mRNA-4203 in participants with metastatic cutaneous melanoma or synovial sarcomaEXPERIMENTALThis is a non-comparative, open-label trial with different cohorts investigating IMA203 in combination with mRNA-4203.
Interventions
NameTypeDescription
IMA203BIOLOGICALone-time administration of IMA203, and adjunctive therapy with low dose interleukin (IL)-2 for up to 10 days, starting approximately 24 h after IMA203 infusion, optional bridging therapy
nivolumab plus relatlimabBIOLOGICALin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
lifileucelBIOLOGICALin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
nivolumabBIOLOGICALin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
pembrolizumabBIOLOGICALin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
ipilimumabBIOLOGICALin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
DacarbazineDRUGin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
temozolomideDRUGin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
paclitaxelDRUGin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
paclitaxel plus carboplatinDRUGin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
Albumin-Bound PaclitaxelDRUGin accordance with current respective prescribing information (PI) and/or summary of product characteristics (SmPC)
mRNA-4203BIOLOGICALmRNA-4203 will be administered starting on Day 15 after IMA203 infusion at the earliest. mRNA-4203 will be given for 12 cycles (28 day cycle length); during Cycle 1 it will be given on Day 1 and Day 15 and in Cycles 2-12 it will be given on Day 1.
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Eligibility Criteria
Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites66

Inclusion Criteria: * Pathologically confirmed and documented cutaneous melanoma- CM patients (including acral melanoma and melanoma of unknown primary) with unresectable or metastatic disease * HLA-A\*02:01 positive * Adequate selected organ function per protocol * Eastern Cooperative Oncology Gro...

Countries:United StatesCanadaFranceGermanyNetherlandsUnited Kingdom
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Recent Changes (Last 90 Days)
LOWJun 10, 2026NCT06743126lastUpdatePostDate: changed
LOWJun 10, 2026NCT06743126lastUpdatePostDate: changed
LOWMay 29, 2026NCT06743126lastUpdatePostDate: changed
LOWMay 29, 2026NCT06743126lastUpdatePostDate: changed
LOWMay 29, 2026NCT06743126lastUpdatePostDate: changed
LOWMay 26, 2026NCT06743126primaryCompletionDate: changed
LOWMay 26, 2026NCT06946225primaryCompletionDate: changed
LOWMay 24, 2026NCT06743126studyFirstPostDate: changed
LOWMay 24, 2026NCT06946225studyFirstPostDate: changed