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MT-401-OTS

Phase 1

Acute Myeloid Leukemia, in Relapse | Small molecule | Oncology |Marker Therapeutics, Inc.|Trials Updated: Dec 16, 2025

MT-401-OTS development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Aug 2024

MT-401-OTS target and mechanism

Molecular targetSurvivin, PRAME, NY-ESO-1, WT-1
Target classTumor Antigens
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment40

FDA Designations

ORPHAN_DRUG

MT-401-OTS clinical trials

MT-401-OTS · 1 trial · 2 indications

Phase 1 1
NCT06552416Safety of MT-401-OTS in Patients With Relapsed AML or MDSAcute Myeloid Leukemia, in Relapse
RECRUITING40 Analytics
PHASE1RECRUITING
Safety of MT-401-OTS in Patients With Relapsed AML or MDS
Acute Myeloid Leukemia, in RelapseUnlock trial analytics

Study Endpoints

Primary Endpoints

Safety of MT-401-OTS
Through study completion. Approximately 5 years

Assess: * Incidence of DLTs to determine the RP2D * Safety (including but not limited to): TEAEs, SAEs, deaths, and clinical laboratory abnormalities per NCI CTCAE, Version 5.0 * Acute GVHD per 2016 MAGIC criteria * CRS and ICANS per ASTCT criteria

Tolerability of MT-401-OTS
Through study completion. Approximately 5 years

cGVHD per 2014 NIH consensus criteria for cGVHD

Secondary Endpoints

To assess the efficacy of MT-401-OTS in participants with high-risk or very-high-risk MDS per IPSS-M who have evidence of disease following at least 4 cycles of a HMA
Following conclusion of the disease assessment of last MDS subject treated. Approximately 2 years
To assess the efficacy of MT-401-OTS in participants with intermediate or high-risk AML per 2022 ELN criteria who have evidence of disease following induction therapy or at least 4 cycles of nonintensive treatment
Following conclusion of the disease assessment of last AML subject treated. Approximately 2 years
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort -1EXPERIMENTAL50 × 106 cells flat dose, 1 dose infused on Day 0
Cohort 1EXPERIMENTAL100 × 106 cells flat dose, 1 dose infused on Day 0
Cohort 2EXPERIMENTAL200 × 106 cells flat dose, 1 dose infused on Day 0
Cohort 3EXPERIMENTAL400 × 106 cells flat dose, 1 dose infused on Day 0
Cohort 4 (optional)EXPERIMENTALup to 400 × 106 cells flat dose TBD based on data from Cohorts 1-3; may include split dosing, dosing with or without lymphodepleting conditioning regimen, or dosing with or without HMA

Interventions

NameTypeDescription
MT-401-OTSDRUGMT-401-OTS is an off the shelf cellular therapy product given by IV infusion through either a peripheral or central line.
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Eligibility Criteria

Age Range65 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites3

Inclusion Criteria: * General 1. Must be ≥ 65 years of age and capable of giving signed informed consent, which includes compliance with the requirements and restrictions listed in the ICF and in the protocol, at the time of signing the ICF 2. Must have a life expectancy ≥ 12 weeks 3. Must h...

Countries:United States
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Frequently asked questions about MT-401-OTS

What is MT-401-OTS?

MT-401-OTS is an investigational cell therapy being developed by Marker Therapeutics, Inc. for acute myeloid leukemia in relapse. It is designed to recognize multiple tumor antigens and is currently in Phase 1 clinical testing. It has received an orphan drug designation from the FDA.

What is MT-401-OTS used for in acute myeloid leukemia?

MT-401-OTS is being studied for the treatment of acute myeloid leukemia in relapse, and the ongoing trial also enrolls patients with myelodysplastic syndromes. It is an investigational product and has not been approved for any indication. Testing is limited to relapsed disease in patients aged 65 years and older.

What does MT-401-OTS target?

MT-401-OTS targets the tumor antigens survivin, PRAME, NY-ESO-1, and WT-1. These antigens are expressed on malignant cells in acute myeloid leukemia, and the product is designed to direct a therapeutic response against cells presenting them. The trial is biomarker selected, meaning patients are screened for relevant antigen expression.

Who is developing MT-401-OTS?

MT-401-OTS is being developed by Marker Therapeutics, Inc., which trades on the Nasdaq under the ticker MRKR. The company is the sponsor of the ongoing Phase 1 study of the product in relapsed acute myeloid leukemia and myelodysplastic syndromes.

What phase is MT-401-OTS in?

MT-401-OTS is in Phase 1 clinical development. It is investigational and has not been approved by the FDA for any indication. The FDA has granted it an orphan drug designation, which is a status separate from marketing approval.

What clinical trials is MT-401-OTS in?

MT-401-OTS is being evaluated in the Phase 1 trial NCT06552416, titled Safety of MT-401-OTS in Patients With Relapsed AML or MDS. The study is currently recruiting in the United States, plans to enroll 40 patients, and is controlled but not randomized or double blinded.