Journal
EXPERT OPINION ON BIOLOGICAL THERAPY
Volume 19, Issue 7, Pages 721-733Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14712598.2019.1623200
Keywords
AML; bispecific antibody; CLEC12A; T cell engager; T cells
Funding
- Merus N.V.
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Objective: We report the characterization of MCLA-117, a novel T cell-redirecting antibody for acute myeloid leukaemia (AML) treatment targeting CD3 on T cells and CLEC12A on leukaemic cells. In AML, CLEC12A is expressed on blasts and leukaemic stem cells.Methods: The functional capacity of MCLA-117 to redirect resting T cells to eradicate CLEC12A(POS) tumor cells was studied using human samples, including primary AML samples.Results: Within the normal hematopoietic compartment, MCLA-117 binds to cells expressing CD3 and CLEC12A but not to early myeloid progenitors or hematopoietic stem cells. MCLA-117 induces T cell activation (EC50=44ng/mL), T cell proliferation, mild pro-inflammatory cytokine release, and redirects T cells to lyse CLEC12A(POS) target cells (EC50=68ng/mL). MCLA-117-induced targeting of normal CD34(POS) cells co-cultured with T cells spares erythrocyte and megakaryocyte differentiation as well as preserves mono-myelocytic lineage development. In primary AML patient samples with autologous T cells, MCLA-117 robustly induced AML blast killing (23-98%) at low effector-to-target ratios (1:3-1:97).Conclusion: These findings demonstrate that MCLA-117 efficiently redirects T cells to kill tumour cells while sparing the potential of the bone marrow to develop the full hematological compartment and support further clinical evaluation as a potentially potent treatment option for AML.
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