Definition

Autologous T lymphocytes transduced with a lentiviral vector expressing a compound chimeric antigen receptor (cCAR) containing two CARs, one specific for the CD33 antigen and one specific for the C-type-lectin-like molecule-1 (CLL1; C-type lectin domain family 12 member A; CLEC12A), with potential immunomodulating and antineoplastic activities. Upon administration, the lentiviral vector-transduced autologous T lymphocytes, expressing both the anti-CD33 CAR and the anti-CLL1 CAR on their surfaces, specifically and simultaneously target and bind to CD33- and CLL1-expressing tumor cells, with their anti-CD33 CAR and their anti-CLL1 CAR, respectively. This induces selective toxicity in tumor cells that express the CD33 antigen and the CLL1 antigen. CD33 is expressed on normal non-pluripotent hematopoietic stem cells and is overexpressed on myeloid leukemia cells. CLL1, a member of the C-type lectin/C-type lectin-like domain (CTL/CTLD) superfamily, is overexpressed in leukemic stem cells (LSCs) and plays an important role in disease progression and relapse for myeloid malignancies.