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Acute Myeloid Leukemia, in RelapsePhase 1RAPIDNCT06552416

Safety of MT-401-OTS in Patients With Relapsed AML or MDS

A Phase 1 study testing MT-401-OTS in people with Acute Myeloid Leukemia, in Relapse and MDS, run by Marker Therapeutics, Inc. at 3 sites in United States.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
Search all trials

Trial summary

This study is a Phase 1 multicenter, open-label study evaluating the safety and efficacy of escalating doses of MT-401-OTS in 2 participant populations: 1) Those with intermediate or high-risk AML per 2022 ELN criteria who have evidence of MRD and/or </= 10% blast following prior induction therapy or at least 4 cycles… Read more about this study

Who is it for?
Ages 65 years and older
Conditions the study is for
Acute Myeloid Leukemia, in Relapse, MDS
What is being tested?
MT-401-OTS
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
40 participants
Where
3 sitesUnited States
Study dates
16 Jun 2025to Sep 2029
Phase
Phase 1
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 65 years and older
  • All sexes
  • No healthy volunteers
  • Older adult

Who may be able to join

  • General
  • 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
  • Must have a life expectancy ≥ 12 weeks
  • Must have an ECOG performance status of 0-2
  • Must have available MT-401-OTS product with a ≥ 2/8 HLA match Disease Characteristics
  • For participants with AML:
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  • Must have a confirmed diagnosis of AML or MDS/AML per 2022 WHO Classification of Haematolymphoid Tumours: Myeloid and Histiocytic/Dendritic Neoplasms or 2022 International Consensus Criteria
  • Must have intermediate or high-risk disease based on ELN 2022 criteria.
  • If no targetable mutation is present, must have received 1 prior standard regimen with at least 4 cycles of standard therapy containing an HMA or a standard cytarabine-containing induction therapy
  • If targetable mutation is present, must have received a regimen that includes commercially available targeted therapy unless unable to tolerate or the participant declines (must be documented in the informed consent). If targeted therapy was not administered as part of first-line of therapy, a second regimen is allowed.
  • Must have either: ≤ 10% bone marrow blasts and ≤ 5% peripheral blasts during screening and not be considered to have hyperproliferating disease at diagnosis or after treatment OR Evidence of MRD based on evaluation at a local laboratory
  • For participants with MDS:
  • Must have confirmed diagnosis of MDS based on 2022 WHO Classification of Haematolymphoid Tumours: Myeloid and Histiocytic/Dendritic Neoplasms or 2022 ICC criteria
  • Must have high-risk or very-high-risk disease based on IPSS-M (ie, not evolved to AML)
  • Must have received standard treatment with at least 4 cycles of an HMA and have evidence of continued disease, including morphologic disease or MRD-positive
  • Must have bone marrow blasts ≤ 10% at screening Health Status
  • Must have adequate coagulation, hepatic, renal, and cardiac function:
  • PT/INR and PTT/aPTT < 1.3 × ULN
  • AST and ALT < 3 × ULN; for participants with leukemic infiltration of the liver (documented by biopsy or imaging), AST and ALT < 5 × ULN is permitted.
  • Total bilirubin ≤ 1.5 × ULN unless bilirubin rise is due to Gilbert's syndrome or of nonhepatic origin (2 × ULN is permitted)
  • eGFR ≥ 40 mL/min by the MDRD formula
  • LVEF ≥ 45% (prior to apheresis and lymphodepletion) Sex
  • Women of childbearing potential are eligible to participate if they agree to the following during the intervention period and for at least 1 year after the last infusion of MT-401-OTS:
  • Must use a contraceptive method that is highly effective (ie, with a failure rate of < 1% per year; see Section 10.3), preferably with low user dependency PLUS
  • Must agree not to donate eggs (ie, ova and oocytes) for the purpose of reproduction
  • Male participants are eligible to participate if they agree to the following during the intervention period and for at least 6 months after the last infusion of MT-401-OTS:
  • Must refrain from donating sperm
  • PLUS either:
  • Must be abstinent from intercourse as their preferred and usual lifestyle (abstinent on a long-term and persistent basis) and agree to remain abstinent OR
  • Must agree to use a male condom AND should also be advised of the benefit for a nonpregnant female partner to use a highly effective method of contraception (see Section 10.3) as a condom may break or leak

Who cannot join

  • Disease-Related
  • Have leukemic involvement in the CNS
  • Have other extramedullary disease involvement (except hepatosplenic involvement)
  • Have APL Medical Conditions
  • Have primary immunodeficiency
  • Have severe or uncontrolled autoimmune disorder
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  • Have a history or presence of clinically relevant CNS pathology, such as epilepsy, seizure, aphasia, stroke, severe brain injuries, dementia, Parkinson's disease, cerebellar disease, organic brain syndrome or psychosis
  • Have active malignancies (ie, those that are progressing or have required treatment change in the last 24 months) other than the disease being treated under study. Exceptions to this inclusion include the following:
  • Nonmelanoma skin cancer treated within the last 24 months that is considered completely cured
  • Adequately treated breast lobular carcinoma in situ and breast ductal carcinoma in situ
  • Adequately treated cervical carcinoma in situ without evidence of disease
  • History of localized breast cancer and receiving antihormonal agents, or history of localized prostate cancer (N0M0) and receiving androgen-deprivation therapy
  • A malignancy that is considered cured with minimal risk of recurrence
  • Have any active systemic infection requiring therapy (viral, bacterial, or fungal), including HIV
  • Have active hepatitis B or C infection or other clinically active liver diseases, as defined below:
  • Seropositivity for hepatitis B as defined by a positive test for HbsAg Participants with resolved infection (ie, participants who are HbsAg-negative with antibodies to total anti-HBc with or without the presence of anti-HBs) must be screened using RT-PCR measurement of HBV DNA levels. Those who are RT PCR-positive will be excluded.
  • Participants with serologic findings suggestive of HBV vaccination (anti HBs positivity as the only serologic marker) AND a known history of prior HBV vaccination, do not need to be tested for HBV DNA by RT PCR.
  • Active hepatitis C infection as defined by being positive for a nucleic acid test for HCV RNA
  • Have Class III or IV congestive heart failure per New York Association
  • Have unstable angina
  • Have a history or evidence of current, uncontrolled, clinically significant, unstable arrhythmias
  • Have an oxygen saturation on room air of ≤ 92%
  • Have clinically significant reversible nonhematologic toxicities from prior cancer therapy that have not recovered to Grade 1 or baseline Note: Participants with clinically nonsignificant toxicities, such as asymptomatic laboratory values, will be allowed on study.
  • Prior/Concomitant Therapies
  • Received prior treatments for underlying malignancy, except as specified in the Inclusion Criteria. Participants with AML secondary to MDS may have received prior treatment for MDS.
  • Have had prior HSCT
  • Are receiving concurrent therapies other than HMA, as delineated in the study design
  • Have received hematopoietic growth factors within 2 days of lymphodepleting conditioning regimen
  • Have a history of severe allergic reactions/intolerance to any of the study intervention components, including the conditioning regimen, HMA, or DSMO, or to tocilizumab
  • Have had major surgery within 14 days (central line placement allowed)
  • Have received systemic steroids (exception: physiological doses of steroids allowed) or other immunosuppressive therapies within 14 days prior to lymphodepleting conditioning regimen Other
  • Are unable to be matched with MT-401-OTS product inventory
  • Are pregnant or breastfeeding
  • Have any other issue that, in the opinion of the treating physician, would make the participant ineligible for the study or unable to comply with its requirements

Trial locations and contacts

3 sites in 1 country. Contact the study team or a site near you to ask about taking part.

United States3 sites, 3 recruiting
  • City of Hope Center (City of Hope National Medical Center, City of Hope Medical Center)

    Duarte, California, 91006

    Stephanie Kasten, 626-215-2835, skasten@coh.org

    Shukaib Arslan, MD

    Recruiting
  • KU Cancer Center

    Kansas City, Kansas, 66160

    Rafaela Nelson, 913-945-9226, rbarbosafernandes@kumc.edu

    Haitham Abdelhakim

    Recruiting
  • Moffitt Cancer Center

    Tampa, Florida, 33612

    Sarah Starr, 813-745-2690, sarah.starr@moffitt.org

    Nelli Bejanyan

    Recruiting

Other trials in United States

About this study

Official title: A Phase 1 Study of Allogenic Off-the-Shelf Multi-Tumor-Associated Antigen-Specific T Cell Products (MT-401-OTS) Administered to Patients With Relapsed Acute Myeloid Leukemia or Myelodysplastic Syndromes (RAPID)

This study is a Phase 1 multicenter, open-label study evaluating the safety and efficacy of escalating doses of MT-401-OTS in 2 participant populations: 1) Those with intermediate or high-risk AML per 2022 ELN criteria who have evidence of MRD and/or </= 10% blast following prior induction therapy or at least 4 cycles of nonintensive therapy and 2) those with high- or very-high-risk MDS per 2023 IWG criteria and who have residual disease with </= 10% blasts following treatment with an HMA-based therapy.

Read the detailed description

This study is a Phase 1 multicenter, open-label study evaluating the safety and efficacy of escalating doses of MT-401-OTS in 2 participant populations: 1) Those with intermediate or high-risk AML per 2022 ELN criteria who have evidence of MRD and/or </= 10% blast following prior induction therapy or at least 4 cycles of nonintensive therapy and 2) those with high- or very-high-risk MDS per 2023 IWG criteria and who have residual disease with </= 10% blasts following treatment with an HMA-based therapy. Participants must meet all eligibility criteria. Once a suitable MT-401-OTS product is confirmed, the participant will receive a lymphodepleting conditioning regimen consisting of fludarabine and cyclophosphamide daily from Day -7 to Day -5. Bendamustine (administered on Days -6 and -5) may be used for participants with underlying toxicities or if lack of availability precludes the use of fludarabine and/or cyclophosphamide. Two standard doses of an HMA (azacitidine or decitabine) will be administered on Day -4 to -3. MT-401-OTS will be administered IV over 10 minutes on Day 0. Safety evaluations will be performed throughout the study. Disease assessments will be performed at regular intervals based on 2022 ELN criteria for AML and the 2023 response criteria for higher-risk MDS. The dose escalations will begin with Cohort 1 which a single MT-401-OTS dose administered at a flat dose of 100 X 10^6 cells). Dose escalations will proceed using the modified 3+3 design up to the highest single flat dose of 400 x 10^6 cells. If a clinical safety issue should arise in Cohort 1, a lower DL may be explored. Additionally, Cohort 4 is an optional cohort that may be considered based on the cumulative data from Cohorts 1 through 3 to asses alternative dosing schedules (split dosing) of 400 X 10^ 6 cells or without lymphodepletion and/or HMA.

Being tested
MT-401-OTS
Medical subject headings
Leukemia, Myeloid, Acute

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • MT-401-OTSDrug

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

Study groups in NCT06552416
Study groupRoleWhat they receive
Cohort -1Experimental50 × 106 cells flat dose, 1 dose infused on Day 0
Receives: Drug: MT-401-OTS
Cohort 1Experimental100 × 106 cells flat dose, 1 dose infused on Day 0
Receives: Drug: MT-401-OTS
Cohort 2Experimental200 × 106 cells flat dose, 1 dose infused on Day 0
Receives: Drug: MT-401-OTS
Cohort 3Experimental400 × 106 cells flat dose, 1 dose infused on Day 0
Receives: Drug: MT-401-OTS
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
Receives: Drug: MT-401-OTS

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Safety of MT-401-OTS

    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

    Measured: Through study completion. Approximately 5 years

  2. Tolerability of MT-401-OTS

    cGVHD per 2014 NIH consensus criteria for cGVHD

    Measured: Through study completion. Approximately 5 years

Secondary outcomes (2)
  1. 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

    Per 2023 IWG criteria for higher-risk MDS:

    • CR rate
    • DOCR
    • ORR
    • DOR

    Measured: Following conclusion of the disease assessment of last MDS subject treated. Approximately 2 years

  2. 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

    Per 2022 ELN Criteria for AML:

    • Rate of MRD negativity
    • CR, DOCR
    • ORR, DOR

    Measured: Following conclusion of the disease assessment of last AML subject treated. Approximately 2 years

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted14 Aug 2024
  2. Study start16 Jun 2025
  3. Primary completionSep 2029 (estimated)
  4. Study completionSep 2029 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Non-randomised
Intervention model
Sequential
Model description
Dose Escalation
Masking
None (open label)
Enrolment
40 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06552416
Sponsor's protocol ID
MRKR-21-401-OTS
Other IDs
5R01FD007272-02
Acronym
RAPID
Status last verified
Dec 2025
First submitted
7 Aug 2024
Last updated
16 Dec 2025
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No: IPD sharing plan will be developed once it is determined that the results of this study may be published or presented at scientific meetings.

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing MT-401-OTS in people with Acute Myeloid Leukemia, in Relapse and MDS, run by Marker Therapeutics, Inc. at 3 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 30 inclusion and 34 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 16 Dec 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 3 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Patricia Allison, BS (713-400-6400, pallison@markertherapeutics.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Safety of MT-401-OTS (time frame: Through study completion. Approximately 5 years). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 16 Dec 2025.

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