Safety and Preliminary Efficacy of MT-601 in Patients With Relapsed/Refractory Lymphoma

NCT ID: NCT05798897

Last Updated: 2025-08-20

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

79 participants

Study Classification

INTERVENTIONAL

Study Start Date

2023-01-02

Study Completion Date

2028-02-28

Brief Summary

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This study is a Phase 1 multicenter study with a Dose Escalation and Dose Expansion evaluating safety and efficacy of MT-601 administration to patients with Relapsed or Refractory Lymphoma. The starting dose administered is 200 x 10\^6 cells (flat dosing).

Detailed Description

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This study is a Phase 1, multicenter, open-label study designed to evaluate the safety and efficacy of MT-601 in participants with relapsed or refractory (R/R) non-Hodgkin lymphoma (NHL) or Hodgkin lymphoma (HL) who either relapsed or had incomplete response after cluster of differentiation (CD) 19-directed chimeric antigen receptor (CAR) T cell therapy or are CAR T cell therapy naïve (ineligible or refused CD19-directed CAR T cell therapy or for whom CAR T cell therapy is not available). The study will consist of two portions or phases: 1) Dose Escalation with allowance for backfilling cohorts (up to 50 participants) followed by 2) Dose Expansion at the preliminary RP2DS in 1-2 disease specific cohorts of up to 29 participants each. The Dose Expansion portion of this study will begin after completion of the Dose Escalation portion. The purpose of the Dose Expansion portion of the study is to evaluate the clinical efficacy of MT-601 at the dose determined to be safe in the Dose Escalation portion.

Conditions

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Non-Hodgkin Lymphoma, Adult Non-Hodgkin Lymphoma, Refractory Non-Hodgkin Lymphoma, Relapsed Non Hodgkin Lymphoma Hodgkin Lymphoma Hodgkin Lymphoma, Adult Hodgkin's Lymphoma, Relapsed, Adult

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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Single Arm Study

Single arm study evaluating MT-601 investigational product at 200 million cells and 400 million cells per dose

Group Type EXPERIMENTAL

MT-601

Intervention Type DRUG

Multi-antigen specific CD4+ andCD8+ T cells

Interventions

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MT-601

Multi-antigen specific CD4+ andCD8+ T cells

Intervention Type DRUG

Eligibility Criteria

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Exclusion Criteria

Participants are eligible to be included in the study only if all of the following criteria apply and the participant, in the judgement of the Investigator, is an appropriate candidate for experimental therapy:

General:

1. Participant must be ≥ 18 years of age and capable of giving signed informed consent (ICF), which includes compliance with the requirements and restrictions listed in the ICF and in the protocol, at the time of signing the ICF.

Disease Specific:
2. Cytologically or histologically confirmed diagnosis of NHL, HL or CLL based on the 2022 World Health Organization (WHO) criteria for hematolymphoid neoplasms
3. Enrollment of the following subtypes will be eligible:

1. LBCL including diffuse large B cell lymphoma, primary mediastinal B cell lymphoma (PMBCL), high grade B cell lymphoma (HGBL), T cell rich B cell lymphoma and transformed indolent lymphoma (transformed iNHL)
2. FL
3. MCL
4. MZL
5. HL

The following additional subtypes may be enrolled in disease specific cohorts during Dose Expansion (upon approval by Sponsor)
6. CLL/SLL
7. CNS lymphoma
8. CAR T cell refractory
4. Must have measurable disease as per 2014 Lugano criteria or 2018 iwCLL criteria. Participants with splenic MZL must have measurable splenomegaly on imaging or evidence of bone marrow involvement.

Prior Treatments
5. Participants who are R/R, are intolerant to, or are considered ineligible for systemic standard of care anticancer treatments, including at least 2 prior therapies. Participants who refuse standard of care treatments may also be considered if documentation is provided that he/she has been made aware of all therapeutic options.
6. For participants with LBCL, FL, and MCL: Have received CD19-directed CAR T cell therapy and relapsed ≥ 30 days or attained an incomplete response as the best response within 1 year after CAR T cell administration. Participants who refuse or are ineligible for CAR T cell therapy are eligible for this study. Note: during Dose Expansion, a specific cohort may be enrolled to evaluate participants who were refractory to CD19-directed CAR T cell therapy.

Health Status
7. Karnofsky score of ≥70 or performance status of 0 or 1 on the Eastern Cooperative Oncology Group (ECOG) scale
8. Life expectancy ≥12 weeks
9. Adequate blood, liver, renal and cardiac function:

1. Hematology: Hemoglobin ≥ 7.0 g/dL (can be transfused), absolute lymphocyte count (ALC) ≥ 300/μL, (prior to apheresis only), absolute neutrophil count (ANC) ≥ 750/μL and platelet count ≥ 50,000/μL (prior to the conditioning regimen only)
2. Liver: Bilirubin ≤ 1.5X upper limit of normal (ULN) (exception of bilirubin elevation due to Gilbert's syndrome 3X); aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ 3X ULN
3. Renal: Serum creatinine ≤ 1.5X ULN or measured or calculated creatinine clearance ≥ 50 mL/min (prior to the conditioning regimen)
4. Cardiac: left ventricular ejection fraction ≥ 45% (prior to the leukapheresis) Sex
10. Female: Is a woman of childbearing potential (WOCBP) and using a contraceptive method that is highly effective (i.e., with a failure rate of \< 1% per year), preferably with low user dependency during the intervention period and for at least 6 months after the last infusion of MT-601 and agrees not to donate eggs (i.e., ova and oocytes) for the purpose of reproduction during this period
11. 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-601:

Refrain from donating sperm

PLUS either:

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 as a condom may break or leak


* Patients are excluded from the study if any of the following criteria apply:

Disease-related

1. Evidence of bulky disease at the time of the conditioning regimen (≥ 10 cm in diameter for LBCL or HL and \> 6 cm for other subtypes)
2. Untreated or ongoing treatment for CNS lymphoma or completed treatment within 2 weeks of apheresis (Note: May be allowed in Dose Expansion if disease specific cohort for CNS lymphoma is opened)
3. Refractory to CAR T therapy defined as a best response of stable disease or disease progression (Note: May be allowed in Dose Expansion if disease specific cohort for CAR T cell therapy refractory is opened)
4. Requirement for urgent therapy due to tumor mass effects such as bowel obstruction or blood vessel compression Medical Conditions
5. Primary immunodeficiency
6. Severe or uncontrolled autoimmune disorder
7. 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
8. Unresolved immune effector cell-associated neurotoxicity syndrome (ICANS) from prior CAR T cell administration. Consideration for Grade 1 may be made after discussion with the Medical Monitor
9. History of malignancy other than nonmelanoma skin cancer or carcinoma in situ (e.g., cervix, bladder, breast, and/or prostate) unless disease free for at least 3 years
10. Cardiac conditions:

1. Medically uncontrolled hypertension (≥ 160 mmHg systolic blood pressure or ≥ 100 mmHg diastolic blood pressure)
2. Congestive heart failure Class ≥ II as defined by the New York Heart Association
3. Acute coronary syndrome (including unstable angina, coronary artery stenting, or angioplasty, bypass grafting within prior 6 months)
4. History or evidence of current, uncontrolled, clinically significant, unstable arrhythmias
11. Oxygen saturation at room air \< 92%
12. Participant has known human immunodeficiency virus (HIV) infection, or active hepatitis B virus (HBV)/hepatitis C virus (HCV) infection
13. Acute bacterial, viral, fungal infection requiring systemic therapy (uncomplicated urinary tract infection and bacterial pharyngitis are permitted if responding to therapy)
14. History of severe allergic reactions to any of the study intervention components including conditioning regimen, dimethyl sulfoxide (DMSO) or to tocilizumab
15. Clinically significant reversible toxicities from prior cancer therapy that have not recovered to Grade 1 or baseline

* Participants with Grade 2 neuropathies due to prior treatment will be allowed on study.
* Participants with clinical nonsignificant toxicities, such as alopecia, will be allowed on study.

Prior/Concomitant Therapy

Prior to Apheresis:
16. Receipt of allogeneic hematopoietic cell transplant (HCT) within 12 months; on immunosuppression or with evidence of donor/mixed chimera
17. Receipt of autologous HCT within 3 months
18. Treatment with CD19-directed CAR T cell therapy within 3 months
19. Treatment with bispecific antibody within 1 month
20. Treatment with antibody drug conjugates (ADC's) or PD-1/PD-L1 within 21 days
21. Treatment with monoclonal antibodies impacting T cell function within 14 days
22. Treatment with systemic immunosuppression including systemic corticosteroids (unless ≤5 mg/day oral prednisone or steroid equivalent) within 14 days
23. Treatment with chemotherapy within 7 days

Prior to the conditioning regimen:
24. Treatment with a live, attenuated vaccine within 4 weeks
25. Treatment with antibody drug conjugates (ADC's) or PD-1/PD-L1 within 21 days
26. Treatment with chemotherapy or biologics/monoclonal antibodies within 14 days
27. Treatment with radiation therapy within 7 days
28. Treatment with a tyrosine kinase inhibitor (TKI) within 7 days or 5 half-lives (whichever is longer) before conditioning regimen
29. Hematopoietic growth factors \<2 days

At either time:
30. Treatment with experimental CAR T cell product unless approved by Medical Monitor
31. Treatment with other cancer therapy including investigational agents that do not fit in the above categories within 14 days
32. Major surgery within 14 days

Other
33. Pregnant or lactating
34. Any other issue which, in the opinion of the treating physician, would make the participant ineligible for the study
Minimum Eligible Age

18 Years

Maximum Eligible Age

100 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Marker Therapeutics, Inc.

INDUSTRY

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Locations

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City of Hope

Duarte, California, United States

Site Status RECRUITING

University of Colorado

Aurora, Colorado, United States

Site Status RECRUITING

Colorado Blood Cancer Institute (Sarah Cannon)

Denver, Colorado, United States

Site Status RECRUITING

University of Kansas Medical Center

Kansas City, Kansas, United States

Site Status RECRUITING

Cornell

New York, New York, United States

Site Status RECRUITING

Sarah Cannon Research Institute at St. David's South Austin

Austin, Texas, United States

Site Status RECRUITING

University of Wisconsin Carbone Cancer Center

Madison, Wisconsin, United States

Site Status RECRUITING

Countries

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United States

Central Contacts

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Juan Vera, MD

Role: CONTACT

1 (713) 591-8100

Patricia Allison

Role: CONTACT

1 (717) 471-5205

Facility Contacts

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Geoffrey Shouse, DO, PhD

Role: primary

626-218-2405

Elizabeth Nguyen

Role: backup

(626) 218-2807

Manali Kamdar, MD

Role: primary

720-848-0752

Celeste Canel

Role: backup

303-724-2692

Luke Mountjoy, DO

Role: primary

720-754-4800

Mallori Buresh

Role: backup

Cari Stockard

Role: primary

913-588-0512

Nicole Santos

Role: primary

Aravind Ramakrishnan, MD

Role: primary

512-816-8600

Eliza Harbert

Role: backup

512-816-5643

Mariah Endres

Role: primary

608-262-7657

Other Identifiers

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MRKR-22-601-01

Identifier Type: -

Identifier Source: org_study_id

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