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Trial Evaluating MGTA-456 in Patients With High-Risk Malignancy

Single-Arm, Open Label, Interventional Phase II Clinical Trial Evaluating MGTA-456 in Patients With High-Risk Malignancy

Status
Active, not recruiting
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT03674411
Enrollment
22
Registered
2018-09-17
Start date
2019-01-02
Completion date
2026-12-01
Last updated
2026-01-06

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Acute Myeloid Leukemia, Acute Lymphocytic Leukemia, Biphenotypic/Undifferentiated Leukemia, Chronic Myelogenous Leukemia, Myelodysplasia, Relapsed Large Cell Lymphoma, Mantle Cell Lymphoma, Hodgkin Lymphoma, Burkitt Lymphoma, Relapsed T-Cell Lymphoma, Lymphoplasmacytic Lymphoma

Keywords

AML, ALL, CML, MCL

Brief summary

This is an single arm, open label, interventional phase II trial evaluating the efficacy of umbilical cord blood (UCB) hematopoietic stem and progenitor cells (HSPC) expanded in culture with stimulatory cytokines (SCF, Flt-3L, IL-6 and thromopoietin) on lympho-hematopoietic recovery. Patients will receive a uniform myeloablative conditioning and post-transplant immunoprophylaxis.

Interventions

25 mg/m2 IV over 1 hour (\<10 kg: 0.83 mg/kg IV over 1 hour)

60 mg/kg IV over 2 hours

DRUGTotal Body Irradiation (TBI)

165 cGy twice daily

Tacrolimus will start day -3 and will be administered as a continuous IV infusion at a starting dose of 0.03 mg/kg/day. Goal trough levels will be 10-15 ng/mL for the first 14 days post-transplant and then decreased to a goal of 5-10 ng/ml thereafter.

DRUGMycophenolate Mofetil (MMF)

MMF 3 gram/day IV/PO for adult patients divided in 2 or 3 doses. Pediatric patients will receive MMF at the dose of 15 mg/kg/dose (max 1 gram per dose) every 8 hours beginning day -3.

5 ug/kg/d until the absolute neutrophil count (ANC) is \>2500/uL for 2 consecutive days

BU IV once daily with dose based on Pharmacokinetics (PK) calculator over 3 hours

DRUGMelphalan

50 mg/m2/day (1.7 mg/kg/day if \< 10 kg) IV over 30 min

DRUGMGTA 456 Infusion

The target cell dose is \>10 x 106 CD34/kg with a maximum TNC 2.7 x 108/kg for children (\<18 years) and 8.1 × 108 cells/kg \[expanded product only\] for adults based on the highest cell dose windows evaluated in prior studies.

Sponsors

Masonic Cancer Center, University of Minnesota
Lead SponsorOTHER

Study design

Allocation
NON_RANDOMIZED
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
No minimum to 55 Years
Healthy volunteers
No

Inclusion criteria

Age, Unit Cell Dose and HLA Match Criteria * Subjects must be ≤55 years of age * Subjects must weigh \>11 kg * Subjects must have a partially HLA matched UCB unit with a pre-cryopreserved TNC dose \>1.0 x 107 per kilogram recipient weight. HLA matching is initially based on a minimum of 5 of 8 HLA alleles at high resolution A, B, C, DRB1 typing; searches will be performed according to the current Magenta Cord Blood Search Algorithm. Eligible Diseases: * Acute myelogenous leukemia (AML) in morphological complete remission with: * Minimal residual disease (MRD) by flow cytometry, or * Intermediate to high risk leukemia in first (CR1) based on institutional criteria, eg. not favorable risk AML which is defined as having one of the following: * t(8,21) without cKIT mutation * inv(16) or t(16;16) without cKIT mutation * Normal karyotype with mutated NPM1 but FLT3-ITD wild type * Normal karyotype with double mutated CEBPA * Acute promyelocytic leukemia (APL) in first molecular remission at the end of consolidation * Any second or subsequent CR, or * Secondary AML with prior malignancy that has been in remission for at least 12 months. * Acute lymphocytic leukemia (ALL) at the following stages: * High risk first morphological, cytogenetic and molecular CR with: * MRD by flow cytometry, or * Diagnosis of Philadelphia chromosome (Ph)+ ALL, or * MLL rearrangement at diagnosis with slow early response at Day 14, or * Hypodiploidy (\< 44 chromosomes or DNA index \< 0.81) at diagnosis, or * End of induction M3 bone marrow, or * End of induction M2 with M2-3 at Day 42. * High risk second CR based on institutional criteria (eg, for children, bone marrow relapse \<36 months from induction or T-lineage bone marrow relapse or very early isolated central nervous system (CNS) relapse \<6 months from diagnosis, or slow re-induction (stage M2-3 at day 28 after induction) regardless of length remission. All patients with MRD by flow cytometry. * Any third or subsequent CR. * Secondary ALL * Biphenotypic/undifferentiated leukemia in morphological, cytogenetic and molecular CR . * Chronic Myelogenous Leukemia (CML) in high risk first chronic phase (failure of two tyrosine kinase inhibitors (TKI) or TKI intolerance), accelerated phase or second chronic phase. * Myelodysplasia (MDS) IPSS Int-2 or High risk (i.e. RAEB, RAEBt \<5% blasts) or other high risk features, including multiple cytopenias, high risk cytogenetics or lack of response to standard therapy.. * Relapsed large-cell lymphoma, mantle-cell lymphoma and Hodgkin lymphoma that is chemotherapy sensitive and ineligible for an autologous transplant. * Burkitt's lymphoma in CR2 or subsequent CR. * Relapsed T-cell lymphoma that is chemotherapy sensitive in CR/PR that is ineligible for an autologous transplant. Organ Specific Inclusion Criteria * Karnofsky score ≥70 (16 years and older), Lansky play score \>50 (children 2-16 years, or 'adequate' score for children \<2 years, as detailed in Appendix II. * Adequate organ function defined as: * Renal: Serum creatinine within normal range for age, or if serum creatinine outside normal range for age, then creatinine clearance \>40 ml/min or GFR ≥70 mL/min/1.73 m2.normal for age * Hepatic: Bilirubin \<3x upper limit of normal (ULN) and AST, ALT and alkaline phosphatase \<5x ULN. * Pulmonary function: DLCO, FEV1, FEC (diffusion capacity) \>5030% of predicted (corrected for hemoglobin); if unable to perform pulmonary function tests, then O2 saturation \>95% on room air. * Cardiac: No uncontrolled arrhythmia and left ventricular ejection fraction at rest must be \>3545%. * Available 'back-up' HSPC graft (e.g, second UCB unit, haploidentical related donor). * Females of child bearing potential and sexually active males must agree to use adequate birth control during study treatment. * Voluntary written consent signed (adult or parental) before performance of any study-related procedure not part of normal medical care.

Exclusion criteria

* Patients with a HLA matched sibling donor or a HLA matched unrelated donor who is available for marrow or peripheral blood stem cell collection at the desired time of transplant. * Pregnant or breast feeding. The agents used in this study may be teratogenic to a fetus and there is no information on the excretion of agents into breast milk. Females of childbearing potential must have a blood test or urine study within 14 days prior to study enrollment to rule out pregnancy. * Evidence of human immunodeficiency virus (HIV) infection or known HIV positive serology. * Active bacterial, viral or fungal infection (currently taking medication and persistence of clinical signs and symptoms) with a minimum of 4 weeks of anti-fungal treatment * Prior autologous or allogeneic transplant. * Other active malignancy. * Subjects \>2 3 years of age unable to receive TBI 1320 cGy due to extensive prior therapy including \>12 months alkylator therapy or \>6 months alkylator therapy with extensive radiation, or prior Y-90 ibritumomab (Zevalin) or I-131 tostumomab (Bexxar), as part of their salvage therapy.

Design outcomes

Primary

MeasureTime frameDescription
Percentage of Participants With Neutrophil RecoverDay 14Percentage of participants with neutrophil recovery by day 14 after transplantation in recipients of MGTA-456.

Secondary

MeasureTime frameDescription
Secondary Graft Failure2 YearsIncidence of secondary graft failure
Platelet RecoveryDay 42Incidence of platelet recovery at day 42
Treatment Related Mortality (TRM)6 MonthsIncidence of TRM at 6 months
Grades II-IV Acute GVHDDay 100Incidence of grades II-IV acute GVHD at day 100
Grades III-IV Acute GVHDDay 100Incidence of grades III-IV acute GVHD at day 100
Number of Days Alive Without HospitalizationDay 0 and Day 100Number of days alive without hospitalization between days 0 and 100 after transplantation
Relapse2 YearsIncidence of relapse at 2 years
Non-catheter Associated Bacterial InfectionsDay 100Incidence of non-catheter associated bacterial infections by day 100
Overall Survival (OS)2 YearsIncidence of overall survival (OS) at 2 years
Event-Free Survival (EFS)2 YearsIncidence of event-free survival (EFS) at 2 years
Chronic GVHD1 YearIncidence of chronic GVHD at 1 year

Countries

United States

Participant flow

Participants by arm

ArmCount
FLU, CY, TBI + MGTA-456 Infusion
All patients aged 3-55 years will be conditioned with cyclophosphamide (CY) 120 mg/kg total dose, fludarabine (FLU) 75 m/m2 total dose and total body irradiation (TBI) 1320 cGy total dose as well as tacrolimus (Tac) and mycophenolate mofetil (MMF) immunoprophylaxis and granulocyte-colony stimulating factor (G-CSF)
16
BU,FLU, MEL + MGTA-456 Infusion
All young children \<3 years of age at the time of diagnosis will receive MGTA-456 on the day of transplantation after a non-TBI containing myeloablative conditioning as TBI may have a damaging effect on brain development in the very young child. All patients aged 0-3 years will be conditioned with busulfan (BU), FLU and melphalan (MEL) as well as Tac/MMF immunoprophylaxis and G-CSF
2
Total18

Withdrawals & dropouts

PeriodReasonFG000FG001
Overall StudyNon-treatment40

Baseline characteristics

CharacteristicTotalFLU, CY, TBI + MGTA-456 InfusionBU,FLU, MEL + MGTA-456 Infusion
Age, Categorical
<=18 years
7 Participants5 Participants2 Participants
Age, Categorical
>=65 years
0 Participants0 Participants0 Participants
Age, Categorical
Between 18 and 65 years
11 Participants11 Participants0 Participants
Ethnicity (NIH/OMB)
Hispanic or Latino
1 Participants1 Participants0 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
15 Participants13 Participants2 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
2 Participants2 Participants0 Participants
Race (NIH/OMB)
American Indian or Alaska Native
2 Participants2 Participants0 Participants
Race (NIH/OMB)
Asian
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Black or African American
1 Participants1 Participants0 Participants
Race (NIH/OMB)
More than one race
3 Participants1 Participants2 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Unknown or Not Reported
2 Participants2 Participants0 Participants
Race (NIH/OMB)
White
10 Participants10 Participants0 Participants
Region of Enrollment
United States
18 participants16 participants2 participants
Sex: Female, Male
Female
6 Participants5 Participants1 Participants
Sex: Female, Male
Male
12 Participants11 Participants1 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
5 / 162 / 2
other
Total, other adverse events
0 / 160 / 2
serious
Total, serious adverse events
0 / 160 / 2

Outcome results

Primary

Percentage of Participants With Neutrophil Recover

Percentage of participants with neutrophil recovery by day 14 after transplantation in recipients of MGTA-456.

Time frame: Day 14

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionPercentage of Participants With Neutrophil Recover31 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionPercentage of Participants With Neutrophil Recover50 Percentage of participants
Secondary

Chronic GVHD

Incidence of chronic GVHD at 1 year

Time frame: 1 Year

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionChronic GVHD13 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionChronic GVHD0 Percentage of participants
Secondary

Event-Free Survival (EFS)

Incidence of event-free survival (EFS) at 2 years

Time frame: 2 Years

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionEvent-Free Survival (EFS)69 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionEvent-Free Survival (EFS)0 Percentage of participants
Secondary

Grades III-IV Acute GVHD

Incidence of grades III-IV acute GVHD at day 100

Time frame: Day 100

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionGrades III-IV Acute GVHD19 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionGrades III-IV Acute GVHD0 Percentage of participants
Secondary

Grades II-IV Acute GVHD

Incidence of grades II-IV acute GVHD at day 100

Time frame: Day 100

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionGrades II-IV Acute GVHD25 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionGrades II-IV Acute GVHD0 Percentage of participants
Secondary

Non-catheter Associated Bacterial Infections

Incidence of non-catheter associated bacterial infections by day 100

Time frame: Day 100

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionNon-catheter Associated Bacterial Infections6 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionNon-catheter Associated Bacterial Infections0 Percentage of participants
Secondary

Number of Days Alive Without Hospitalization

Number of days alive without hospitalization between days 0 and 100 after transplantation

Time frame: Day 0 and Day 100

ArmMeasureValue (MEDIAN)
FLU, CY, TBI + MGTA-456 InfusionNumber of Days Alive Without Hospitalization67.5 Days
BU,FLU, MEL + MGTA-456 InfusionNumber of Days Alive Without Hospitalization33 Days
Secondary

Overall Survival (OS)

Incidence of overall survival (OS) at 2 years

Time frame: 2 Years

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionOverall Survival (OS)69 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionOverall Survival (OS)0 Percentage of participants
Secondary

Platelet Recovery

Incidence of platelet recovery at day 42

Time frame: Day 42

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionPlatelet Recovery56 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionPlatelet Recovery50 Percentage of participants
Secondary

Relapse

Incidence of relapse at 2 years

Time frame: 2 Years

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionRelapse25 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionRelapse50 Percentage of participants
Secondary

Secondary Graft Failure

Incidence of secondary graft failure

Time frame: 2 Years

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionSecondary Graft Failure37.5 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionSecondary Graft Failure0 Percentage of participants
Secondary

Treatment Related Mortality (TRM)

Incidence of TRM at 6 months

Time frame: 6 Months

ArmMeasureValue (NUMBER)
FLU, CY, TBI + MGTA-456 InfusionTreatment Related Mortality (TRM)6 Percentage of participants
BU,FLU, MEL + MGTA-456 InfusionTreatment Related Mortality (TRM)50 Percentage of participants

Source: ClinicalTrials.gov · Data processed: Feb 20, 2026