Effectorless Fc-fusion improves FLT3L drug-like properties for cancer immunotherapy combinations.

Background: Conventional dendritic cells (cDCs), are central to antitumour immunity, but their low prevalence in tumours limits the efficacy of immunotherapies. FLT3L is a key growth factor regulating cDCs development in the bone marrow. It expands cDCs when administered exogenously, favouring antitumour T cell priming and tumour control.

Nonclinical pharmacokinetics, pharmacodynamics and safety assessment of a FLT3L-Fc molecule for cancer immunotherapy.

FLT3L-Fc is a cytokine-Fc fusion agonizing receptor-type tyrosine-protein kinase FLT3 (fms-related tyrosine kinase 3; CD135). FLT3 is expressed on dendritic cells (DCs) as well as myeloid and lymphoid progenitors. Nonclinical pharmacokinetics, pharmacodynamics and safety of FLT3L-Fc were investigated in rats and cynomolgus monkeys.