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Study of CART-ddBMCA in Relapsed or Refractory Multiple Myeloma (iMMagine-1)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details.
 
ClinicalTrials.gov Identifier: NCT05396885
Recruitment Status : Recruiting
First Posted : May 31, 2022
Last Update Posted : December 7, 2022
Sponsor:
Collaborator:
Multiple Myeloma Research Foundation
Information provided by (Responsible Party):
Arcellx, Inc.

Brief Summary:
A Phase II study of CART-ddBCMA for patients with relapsed or refractory multiple myeloma. CART-ddBCMA is a BCMA-directed CAR-T cell therapy

Condition or disease Intervention/treatment Phase
Multiple Myeloma Biological: CART-ddBCMA Phase 2

Detailed Description:

This is a Phase II open-label study of CART-ddBCMA* in patients with relapsed or refractory multiple myeloma (MM). The study will have the following sequential phases: screening, enrollment, pre-treatment with lymphodepleting chemotherapy, treatment with CART-ddBCMA, and follow-up. If necessary, bridging therapy is allowed to control growth of MM disease while CART-ddBCMA is being manufactured.

Following a single infusion of CART-ddBCMA both safety and efficacy data will be assessed. Efficacy will be assessed monthly for the first 6 months, then quarterly up to 2 years, or upon patient relapse. The primary analysis will be conducted approximately 13 months after the final patient is dosed. This will allow approximately 12 months follow up from the time of the last observed response on study.

Long-term safety data will be collected under a separate long-term follow up study for up to 15 years per health authority guidelines.

*CART-ddBCMA drug product consists of autologous T cells that have been genetically modified ex vivo to express a D-domain Chimeric Antigen Receptor (CAR), followed by a cluster of differentiation 8 (CD8) hinge and transmembrane region that is fused to the intracellular signaling domains for 4-1BB and CD3ξ, that specifically recognizes B-cell maturation antigen (BCMA). The active substance of CART-ddBCMA is CAR+ CD3+ T cells that have undergone ex vivo T-cell activation, gene transfer by replication-deficient lentiviral vector, and expansion.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 110 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Phase II Study of CART-ddBCMA for the Treatment of Patients With Relapsed or Refractory Multiple Myeloma
Actual Study Start Date : August 9, 2022
Estimated Primary Completion Date : May 31, 2024
Estimated Study Completion Date : May 31, 2025

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Multiple Myeloma

Arm Intervention/treatment
Experimental: CART-ddBCMA
Single dose of 115±10 x 10e-6 CAR+ CART-ddBCMA cells infused intravenously
Biological: CART-ddBCMA
BCMA-directed CAR T-cell therapy using a novel, synthetic binding domain, called a D-domain




Primary Outcome Measures :
  1. Overall Response Rate (ORR) [ Time Frame: 24 Months ]
    ORR Per International Myeloma Working Group (IMWG) criteria, as assessed by an independent review committee (IRC)


Secondary Outcome Measures :
  1. Stringent complete response (sCR) or complete response (CR) rate [ Time Frame: 24 Months ]
    The proportion of subjects in whom best response of sCR or CR, by IMWG criteria

  2. Overall Response Rate (ORR) of subjects limited to three lines of prior treatment [ Time Frame: 24 Months ]
    ORR per IMWG criteria, as assessed by an independent review committee (IRC), of subjects limited to three lines of prior treatment

  3. Duration of Response (DoR) [ Time Frame: 24 Months ]
    Time from the date of first documentation of response of PR or better per IMWG criteria after CART-ddBCMA infusion to the earlier of first documentation of disease progression per IMWG criteria or death

  4. Very Good Partial Response (VGPR) Rate and Partial Response (PR) Rate [ Time Frame: 24 Months ]
    The proportion of subjects with best response of VGPR and PR, respectively, by IMWG criteria

  5. Time to Initial Response [ Time Frame: 24 months ]
    Time to initial response measurement of time (e.g., days or months) from the date of infusion of CART-ddBCMA to the date upon which the first IMWG response (i.e., PR or better) occurs

  6. Progression Free Survival (PFS) [ Time Frame: 24 Months ]
    Measurement of time (e.g., days or months) from the date of infusion of CART-ddBCMA to the date upon which the IMWG criteria for progressive disease or death occurs

  7. Overall Survival (OS) [ Time Frame: 24 Months ]
    Measurement of time (e.g., days or months) from the date of infusion of CART-ddBCMA to the date upon which death from any cause occurs

  8. Safety Profile of CART-ddBCMA [ Time Frame: 24 Months ]
    Summarization of adverse event (AE) terms, frequency, and severity using CTCAE version 5.0, the adverse events of special interest (AESIs), the serious adverse events (SAEs)

  9. Define the Pharmacokinetics of CART-ddBCMA [ Time Frame: 24 Months ]
    Quantification of CART-ddBCMA cells using vector copy number (VCN) on peripheral blood mononuclear cells

  10. Anti-CART-ddBCMA Antibodies [ Time Frame: 24 Months ]
    Proportion of subjects who develop antibodies against CART-ddBCMA and the timing and titer of antibodies developed

  11. Health Related Quality of Life (HRQoL) [ Time Frame: 24 Months ]
    Measure the change in HRQoL pre- versus post-treatment with CART-ddBCMA



Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  1. Age 18 years or older and has capacity to give informed consent
  2. Relapsed or refractory multiple myeloma treated with at least 3 prior regimens of systemic therapy including proteasome inhibitor, immunomodulatory drugs (IMiDs) and anti-CD38 antibody and are refractory to the last line of therapy. For each line, 2 consecutive cycles are required unless the best response after 1 cycle was progressive disease.

    a. Note: IMWG criteria defines refractory disease as disease progression on or within 60 days of a therapy Note: Induction treatment with or without hematopoietic stem cell transplant and with or without maintenance is considered a single regimen

  3. Documented measurable disease including at least one or more of the following criteria:

    1. Serum M-protein ≥1.0 g/dL
    2. Urine M-protein ≥200 mg/24 hours
    3. Involved serum free light chain ≥10 mg/dL with abnormal κ/λ ratio (i.e., >4:1 or <1:2)
  4. Eastern Cooperative Oncology Group (ECOG) performance status 0-1
  5. Life expectancy >12 weeks
  6. Adequate organ function defined as:

    1. Oxygen (O2) saturation ≥92% on room air
    2. Left Ventricular Ejection Fraction (LVEF) ≥45% by echocardiogram (ECHO) or multigated acquisition (MUGA) scan
    3. Absolute neutrophil count (ANC) ≥1.0k/µl, platelet count (PLT) ≥50k/µl, (NOTE: Platelet transfusion not allowed within 14 days; growth factor neupogen not allowed within 7 days, neulasta within 14 days)
    4. Creatinine clearance ≥30 mL/min and not on dialysis
    5. Aspartate transaminase (AST)/alanine transaminase (ALT) <3 x upper limits of normal (ULN)
    6. Total bilirubin <1.5 x ULN (allow 3x ULN for Gilbert's syndrome)
    7. Prothrombin time test (PTT), prothrombin time (PT)/international normalized ratio (INR) <1.5 x ULN, unless on a stable dose of anti-coagulant for a thromboembolic event (Patients with any history of thromboembolic stroke; or history or Grade 2 (G2) or greater hemorrhage within 60 days are excluded)
  7. Resolution of adverse events (AEs) from any prior systemic anticancer therapy, radiotherapy, or surgery to Grade 1 or baseline (except G2 alopecia and G2 sensory neuropathy)
  8. Male and female participants of childbearing potential must agree to use highly effective methods of birth control through 12 months after the dose of study treatment
  9. Willing to comply with and able to tolerate study procedures, including consent to participate in separate Long-term Safety Follow-up lasting up to 15 years per FDA guidance
  10. Subject's leukapheresis product from non-mobilized cells is received and accepted for cell processing by manufacturing site

Exclusion Criteria:

  1. Plasma cell leukemia or history of plasma cell leukemia
  2. Treatment with the following therapies as specified below

    1. Any prior systemic treatment for multiple myeloma within the 14 days prior to scheduled leukapheresis unless discussed with medical monitor
    2. Receiving high-dose (e.g., >10 mg prednisone or equivalent) systemic steroid therapy or any other form of immunosuppressive therapy within 14 days prior to leukapheresis
    3. Prior treatment with any gene therapy or gene-modified cellular immune-therapy
    4. Prior B-cell maturation antigen (BCMA) directed therapy
    5. Autologous stem cell transplantation within 3 months prior to leukapheresis, or any prior allogeneic stem cell transplantation
  3. Patients with solitary plasmacytomas without evidence of other measurable disease
  4. History of allergy or hypersensitivity to study drug components. Patients with a history of severe hypersensitivity reaction to dimethyl sulphoxide (DMSO)
  5. Contraindication to fludarabine or cyclophosphamide
  6. Severe or uncontrolled intercurrent illness or laboratory abnormalities including

    1. Active bacterial, viral, or fungal infection requiring systemic treatment (isolated fever may not constitute active infection in and of itself, (e.g., related to disease)
    2. Symptomatic congestive heart failure
    3. Unstable angina, arrhythmia, or myocardial infarction (MI) within 6 months prior to Screening
    4. Significant pulmonary dysfunction
    5. Uncontrolled thromboembolic events or recent severe hemorrhage
    6. Any history of pulmonary embolism (PE) in the past 12 months or deep vein thrombosis (DVT) within three months of enrollment. Therapeutic dosing of anticoagulants (e.g., warfarin, low molecular weight heparin, Factor Xa inhibitors) is allowed for history of PE/DVT if greater than twelve and three months, respectively, from time of enrollment, should be at a stable maintenance dose.
    7. Auto-immune disease requiring immunosuppressive therapy
  7. Seropositive for and with evidence of active hepatitis B or C infection at time of Screening, or HIV seropositive

    1. Subjects with a history of hepatitis B but have received antiviral therapy and have non-detectable viral DNA for 6 months are eligible
    2. Subjects seropositive because of hepatitis B virus vaccine with no signs or active infection are eligible
    3. Subjects who had hepatitis C but have received antiviral therapy and show no detectable hepatitis C virus (HCV) viral RNA for 6 months are eligible
  8. Active central nervous system (CNS) involvement by malignancy. NOTE: subjects who are asymptomatic, stable, and received prior effective treatment for CNS disease may be eligible after discussion with medical monitor
  9. Any sign of active or prior CNS pathology including history of epilepsy, seizure, paresis, aphasia, stroke, subarachnoid hemorrhage or CNS bleed, severe brain injury, dementia, cerebellar disease, Parkinson's disease, organic brain syndrome or psychosis
  10. Active malignancy not related to myeloma that has required therapy in the last 3 years or is not in complete remission. Exceptions to this criterion include successfully treated non-metastatic basal cell or squamous cell skin carcinoma, or prostate cancer that does not require therapy. Other similar malignant conditions may be discussed with and permitted by the medical monitor
  11. Females who are pregnant or breastfeeding or females of childbearing potential not using an effective method of birth control
  12. Subjects with any significant medical condition, laboratory abnormality, or psychiatric illness that would prevent the subject from participating in study (or full access to medical records) as written including follow up, the interpretation of data or place the subject at unacceptable risk

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT05396885


Contacts
Layout table for location contacts
Contact: Juliette Beaulieu 415-940-4170 jbeaulieu@arcellx.com

Locations
Show Show 18 study locations
Sponsors and Collaborators
Arcellx, Inc.
Multiple Myeloma Research Foundation
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Responsible Party: Arcellx, Inc.
ClinicalTrials.gov Identifier: NCT05396885    
Other Study ID Numbers: ARC-112A
First Posted: May 31, 2022    Key Record Dates
Last Update Posted: December 7, 2022
Last Verified: December 2022
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Multiple Myeloma
Neoplasms, Plasma Cell
Neoplasms by Histologic Type
Neoplasms
Hemostatic Disorders
Vascular Diseases
Cardiovascular Diseases
Paraproteinemias
Blood Protein Disorders
Hematologic Diseases
Hemorrhagic Disorders
Lymphoproliferative Disorders
Immunoproliferative Disorders
Immune System Diseases