Study of Anitocabtagene-autoleucel in Relapsed or Refractory Multiple Myeloma (iMMagine-1) (iMMagine-1)

• ClinicalTrials.gov Identifier: NCT05396885
• Recruitment Status: Recruiting
• First Posted: May 31, 2022
• Last Update Posted: April 15, 2024
• Sponsor: Kite, A Gilead Company
• Collaborator: Arcellx, Inc.
• Information provided by (Responsible Party): Gilead Sciences ( Kite, A Gilead Company )

Tracking Information

• First Submitted Date: May 12, 2022
• First Posted Date: May 31, 2022
• Last Update Posted Date: April 15, 2024
• Actual Study Start Date: August 9, 2022
• Estimated Primary Completion Date: May 31, 2024 (Final data collection date for primary outcome measure)

Current Primary Outcome Measures (submitted: December 3, 2022)

Overall Response Rate (ORR) [ Time Frame: 24 Months ]

ORR Per International Myeloma Working Group (IMWG) criteria, as assessed by an independent review committee (IRC)

Original Primary Outcome Measures (submitted: May 25, 2022)

Subject Response Rate (Overall Response Rate) [ Time Frame: 24 months ]

Independent review committee will review results from blood, bone marrow, urine samples and, if applicable, radiographical assessments to determine overall response rate (ORR) per International Myeloma Working Group (IMWG) criteria (Kumar 2016).

Current Secondary Outcome Measures (submitted: March 1, 2024)

• 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,as assessed by an independent review committee (IRC) per by IMWG criteria
• 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
• 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 anitocabtagene-autoleucel infusion to the earlier of first documentation of disease progression per IMWG criteria or death
• 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
• Time to Initial Response [ Time Frame: 24 months ]
  Time to initial response measurement of time from the date of infusion of anitocabtagene-autoleucel to the date upon which the first IMWG response (i.e., PR or better) occurs
• Progression Free Survival (PFS) [ Time Frame: 24 Months ]
  Measurement of time from the date of infusion of anitocabtagene-autoleucel to the date upon which the IMWG criteria for progressive disease or death occurs
• Overall Survival (OS) [ Time Frame: 24 Months ]
  Measurement of time (e.g., days or months) from the date of infusion of anitocabtagene-autoleucel to the date upon which death from any cause occurs
• Safety Profile of anitocabtagene-autoleucel as assessed by incidence and severity of adverse events [ 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)
• Pharmacokinetics of anitocabtagene-autoleucel [ Time Frame: 24 Months ]
  Define the Pharmacokinetics of anitocabtagene-autoleucel using vector copy number (VCN) on peripheral mononuclear cells at defined timepoints. Quantification of anitocabtagene-autoleucel cells using vector copy number (VCN) on peripheral blood mononuclear cells
• Anti-anitocabtagene-autoleucel Antibodies [ Time Frame: 24 Months ]
  Proportion of subjects who develop antibodies against anitocabtagene-autoleucel and the timing and titer of antibodies developed
• Health Related Quality of Life (HRQoL) [ Time Frame: 24 Months ]
  Measure the change in HRQoL pre- versus post-treatment with anitocabtagene-autoleucel
• Minimal Residual Disease (MRD) negativity [ Time Frame: 24 Months ]
  The proportion of subjects that are MRD negative (i.e., no measurable tumor cells in at least 105 cells isolated from the bone marrow) from the EE population and from the MRD evaluable population (i.e., those subjects with baseline sample allowing MRD calibration)
• Time to Progression (TTP) [ Time Frame: 24 Months ]
  Measurement of time from date of anitocabtagene-autoleucel infusion to first documented IRC assessed progression using IMWG criteria or death due to disease progression

Original Secondary Outcome Measures (submitted: May 25, 2022)

• Stringent Complete Response (sCR) or Complete Response (CR) Rate [ Time Frame: 24 months ]
  Number of subjects who have a best response of stringent complete response (sCR) or complete response (CR) by IMWG criteria.
• Length of Disease Response [ Time Frame: 24 months ]
  For all subjects, the amount of time (e.g., days or months) from the date of first response achieved by IMWG criteria until the date at which progression or death occurs to determine duration of response (DoR).
• Very Good Partial Response (VGPR) or Partial Response (PR) Rate [ Time Frame: 24 months ]
  Number of subjects who achieve an overall best response of VGPR or PR as determined by IMWG criteria
• Length of Time to First Disease Response [ Time Frame: 24 months ]
  The amount of time (e.g., days or months) from the date of infusion of CART-ddBCMA to the date upon which the first disease response of PR or better occurs by IMWG criteria.
• Progression Free Survival (PFS) and Overall Survival (OS) [ Time Frame: 24 months ]
  Time (e.g., days or months) from the date of infusion to the date upon which progression of disease is determined by IMWG criteria or death by any cause occurs.
• Minimal Residual Disease (MRD) [ Time Frame: 24 months ]
  Number of subjects that are MRD negative (i.e., no measurable tumor cells in at least 105 cells isolated from the bone marrow) by central laboratory assessment and how this correlates to sCR/CR rates, duration of response and progression free survival.
• Adverse Event Collection [ Time Frame: 24 months ]
  Using CTCAE version 5.0, review the number of adverse events that occur for all sujbects including adverse events of special interest (AESIs) and serious adverse events (SAEs).
• Pharmacokinetics of CART-ddBCMA [ Time Frame: 24 months ]
  Collect blood samples to isolate and analyze the number of peripheral blood mononuclear cells by vector copy number (VCN) at defined timepoints
• Anti-CART-ddBCMA antibodies [ Time Frame: 24 months ]
  Analyze blood serum samples to determine the proportion of subjects who develop antibodies against CART-ddBCMA and the timing and titer of antibodies developed
• Health Related Qualify of Life (HRQoL) [ Time Frame: 24 months ]
  Data collected by self assessment using validated questionnaires to compare total scores reported in pre versus post treatment and at specified timepoints.

• Current Other Pre-specified Outcome Measures: Not Provided
• Original Other Pre-specified Outcome Measures: Not Provided

Descriptive Information

• Brief Title: Study of Anitocabtagene-autoleucel in Relapsed or Refractory Multiple Myeloma (iMMagine-1)
• Official Title: A Phase II Study of CART-ddBCMA for the Treatment of Patients With Relapsed or Refractory Multiple Myeloma
• Brief Summary: A Phase II study of anitocabtagene-autoleucel (formerly CART-ddBCMA) for patients with relapsed or refractory multiple myeloma. Anitocabtagene-autoleucel is a BCMA-directed CAR-T cell therapy.

Detailed Description

This is a Phase II open-label study of anitocabtagene-autoleucel * 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 anitocabtagene-autoleucel , and follow-up. If necessary, bridging therapy is allowed to control growth of MM disease while anitocabtagene-autoleucel is being manufactured.

Following a single infusion of anitocabtagene-autoleucel 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.

*Anitocabtagene-autoleucel 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 anitocabtagene-autoleucel is CAR+ CD3+ T cells that have undergone ex vivo T-cell activation, gene transfer by replication-deficient lentiviral vector, and expansion.

• Study Type: Interventional
• Study Phase: Phase 2
• Study Design: Allocation: N/A; Intervention Model: Single Group Assignment; Masking: None (Open Label); Primary Purpose: Treatment
• Condition: Multiple Myeloma

Intervention

Biological: anitocabtagene-autoleucel

Anitocabtagene-autoleucel-directed CAR T-cell therapy using a novel, synthetic binding domain, called a D-domain

Other Name: CART-ddBCMA

Study Arms

Experimental: anitocabtagene-autoleucel

Single dose of 115±10 x 10e-6 CAR+ anitocabtagene-autoleucel cells infused intravenously

Intervention: Biological: anitocabtagene-autoleucel

• Publications *: Not Provided

Recruitment Information

• Recruitment Status: Recruiting
• Estimated Enrollment (submitted: December 3, 2022): 110
• Original Estimated Enrollment (submitted: May 25, 2022): 100
• Estimated Study Completion Date: May 31, 2025
• Estimated Primary Completion Date: May 31, 2024 (Final data collection date for primary outcome measure)

Eligibility 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 (IMiD) 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.

   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; filgrastim (or biosimilar) not allowed within 7 days, pegfilgrastim (or biosimilar) within 14 days]

   4. Creatinine clearance ≥45 mL/min min (as determined by the Cockgroft-Gault equation) 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 (Subjects with any history of thromboembolic stroke; or history or Grade 2 (G2) or greater hemorrhage within one year 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. NOTE: Leukapheresis will be performed only after all other eligibility criteria are confirmed

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
   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. Subjects with solitary plasmacytomas without evidence of other measurable disease are excluded
4. History of allergy or hypersensitivity to study drug components. Subjects with a history of severe hypersensitivity reaction to dimethyl sulphoxide (DMSO) are excluded
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 (i.e., New York Heart Association stage III or IV)
   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 (i.e., within one year)
   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, and should be at a stable maintenance dose.
   7. Auto-immune disease requiring immunosuppressive therapy within the last 24 months

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 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 are eligible
8. Active central nervous system (CNS) involvement by malignancy
9. Any sign of active or prior CNS pathology including but not limited to 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.
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
13. Any vaccine ≤ 6 weeks before leukapheresis and/or anticipation of the need for such a vaccine during the subject's participation in the study
14. Concurrent enrollment on another study using an investigational therapy for the treatment of RRMM

Sex/Gender

• Sexes Eligible for Study: All

• Ages: 18 Years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Contacts

Contact: Clinical Information; 240-327-0379; clinical@arcellx.com

• Listed Location Countries: United States

Administrative Information

• NCT Number: NCT05396885
• Other Study ID Numbers: ARC-112A
• Has Data Monitoring Committee: Yes

U.S. FDA-regulated Product

• Studies a U.S. FDA-regulated Drug Product: Yes
• Studies a U.S. FDA-regulated Device Product: No

IPD Sharing Statement

• Plan to Share IPD: No

• Current Responsible Party: Gilead Sciences ( Kite, A Gilead Company )
• Original Responsible Party: Arcellx, Inc.
• Current Study Sponsor: Kite, A Gilead Company
• Original Study Sponsor: Arcellx, Inc.
• Collaborators: Arcellx, Inc.

Investigators

• Study Chair: Tim Welliver, MD, PhD; Arcellx, Inc.

• PRS Account: Gilead Sciences
• Verification Date: April 2024