ACTengine® IMA203 Combined With mRNA-4203

NCT ID: NCT06946225

Last Updated: 2026-01-08

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Clinical Phase

PHASE1

Total Enrollment

15 participants

Study Classification

INTERVENTIONAL

Study Start Date

2025-07-25

Study Completion Date

2029-08-31

Brief Summary

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This purpose of this clinical trial is to evaluate the safety, tolerability and anti-tumor activity of IMA203 in combination with different doses of mRNA-4203. The trial includes participants with previously treated unresectable or metastatic cutaneous melanoma (CM) or synovial sarcoma (SS).

Detailed Description

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This clinical trial is a multi-center, open-label, non-comparative Phase 1 a/b trial to assess the safety, tolerability, and anti-tumor activity of the combination of IMA203 and mRNA-4203 in HLA-A\*02:01 positive patients with previously treated, unresectable or metastatic cutaneous melanoma (CM) and synovial sarcoma (SS).

Conditions

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Cutaneous Melanoma Synovial Sarcoma

Study Design

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Allocation Method

NA

Intervention Model

SINGLE_GROUP

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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IMA203 with mRNA-4203 in participants with metastatic cutaneous melanoma or synovial sarcoma

This is a non-comparative, open-label trial with different cohorts investigating IMA203 in combination with mRNA-4203.

Group Type EXPERIMENTAL

IMA203

Intervention Type BIOLOGICAL

Following non-myeloablative chemotherapy for lymphodepletion (LD) with fludarabine (FLU) and cyclophosphamide (CY), participants will receive a single infusion of IMA203 on Day 1 and adjunctive therapy with low dose interleukin (IL)-2 for up to 10 days, starting approximately 24 h after IMA203 infusion.

mRNA-4203

Intervention Type BIOLOGICAL

mRNA-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.

Interventions

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IMA203

Following non-myeloablative chemotherapy for lymphodepletion (LD) with fludarabine (FLU) and cyclophosphamide (CY), participants will receive a single infusion of IMA203 on Day 1 and adjunctive therapy with low dose interleukin (IL)-2 for up to 10 days, starting approximately 24 h after IMA203 infusion.

Intervention Type BIOLOGICAL

mRNA-4203

mRNA-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.

Intervention Type BIOLOGICAL

Other Intervention Names

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anzutresgene autoleucel anzu-cel anzu-cel

Eligibility Criteria

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Inclusion Criteria

* Pathologically confirmed and documented cutaneous melanoma (CM) or synovial sarcoma (SS) with unresectable or metastatic disease
* HLA-A\*02:01 positive
* Adequate selected organ function per protocol
* Eastern Cooperative Oncology Group (ECOG) performance status 0-1
* Measurable disease according to Response Evaluation Criteria in Solid Tumors (RECIST 1.1)
* Life expectancy more than 5 months
* CM participants who must have disease progression (resistance, toxicity) on or after at least one PD-1 inhibitor
* SS participants must have received (or declined) at least one line of treatment (including SoC) and are still in need of further systemic therapy.
* Female participants of childbearing potential must use adequate contraception prior to trial entry until 12 months after the infusion of IMA203 and 15 days after the last mRNA 4203 dose administration

Exclusion Criteria

* History of other malignancies (except for adequately treated basal or squamous cell carcinoma or carcinoma in situ) within the last 3 years
* Pregnant or breastfeeding
* Serious autoimmune disease
* History of cardiac conditions as per protocol
* Prior allogenic stem cell transplantation or solid organ transplantation
* Concurrent severe and/or uncontrolled medical disease that could compromise participation in the study
* History of hypersensitivity to cyclophosphamide, fludarabine, or IL-2
* History of hypersensitivity to mRNA-based medicines
* Positive for HIV infection or with active hepatitis B virus (HBV) or active hepatitis C virus (HCV) infection
* Any condition contraindicating leukapheresis
* Participants with lactate dehydrogenase (LDH) greater than threshold allowed per protocol
* Participants with active brain metastases prior to lymphodepletion
* Concurrent treatment in another clinical trial or a device trial that could interfere with the IMA203 treatment
* Participants with renal impairment AND reduced bone marrow reserve per protocol
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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ModernaTX, Inc.

INDUSTRY

Sponsor Role collaborator

Immatics US, Inc.

INDUSTRY

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Locations

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University of California San Francisco

San Francisco, California, United States

Site Status RECRUITING

Dana Farber Cancer Institute

Boston, Massachusetts, United States

Site Status RECRUITING

Memorial Sloan Kettering Cancer Center

New York, New York, United States

Site Status RECRUITING

MD Anderson Cancer Center

Houston, Texas, United States

Site Status RECRUITING

Countries

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United States

Central Contacts

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Immatics US, Inc.

Role: CONTACT

+1 346 204-5400

Facility Contacts

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Adil Daud, MD

Role: primary

Karam Khaddour, MD

Role: primary

Sydney Srnka

Role: backup

James Smithy, MD

Role: primary

Dejka Araujo, MD

Role: primary

Rodabe Amaria, MD

Role: backup

Other Identifiers

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IMA203-102

Identifier Type: -

Identifier Source: org_study_id

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