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Targeting T Cell Malignancies Using CD4CAR T-Cells and Implementing a Natural Safety Switch.

Gina Ma1, Jiaqi Shen1, Kevin Pinz1

  • 1iCell Gene Therapeutics LLC, Research & Development Division, Long Island High Technology Incubator, 25 Health Sciences Drive, Stony Brook, NY, 11790, USA.

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A novel CD4 CAR T cell therapy shows promise for treating CD4-positive T-cell acute lymphoblastic leukemia. CAMPATH acts as a safety switch to manage potential toxicities, supporting clinical investigation.

Keywords:
AlemtuzumabAnti-CD4 CARCAMPATHImmunotherapyT cell malignanciesT-cells

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Area of Science:

  • Immunology
  • Oncology
  • Cell Therapy

Background:

  • T cell malignancies are aggressive cancers with limited treatment options and poor prognoses.
  • The success of CD19 CAR T cell therapy for B cell malignancies suggests potential for T cell cancers.
  • T cell depletion due to shared antigen targets is a significant challenge for CAR T cell therapy in T cell malignancies.

Purpose of the Study:

  • To describe a CD4 CAR T cell therapy for eliminating CD4-positive T cell acute lymphoblastic leukemia.
  • To evaluate the safety and efficacy of CD4 CAR T cells in a preclinical mouse model.
  • To investigate the use of CAMPATH (alemtuzumab) as a safety switch to mitigate toxicities.

Main Methods:

  • Development of a CD4 CAR construct targeting CD4-positive T cells.
  • Establishment of a systemic mouse model for CD4-positive T cell acute lymphoblastic leukemia.
  • Administration of CD4 CAR T cells and evaluation of tumor elimination.
  • Utilizing CAMPATH (alemtuzumab) to deplete infused CD4 CAR T cells as a safety measure.

Main Results:

  • The developed CD4 CAR effectively eliminated CD4-positive T cell malignancies in a mouse model.
  • CAMPATH (alemtuzumab) successfully depleted infused CD4 CAR T cells, preventing associated toxicities.
  • The study demonstrated the feasibility of using CD4 CAR T cells for T-cell leukemia treatment.

Conclusions:

  • CD4 CAR T cells represent a potential therapeutic strategy for CD4-positive T-cell acute lymphoblastic leukemia.
  • The integration of a safety switch like CAMPATH is crucial for managing CAR T cell therapy-related toxicities.
  • Further clinical investigation is warranted to explore the efficacy of CD4 CAR T cells in patients with refractory T-cell malignancies.