fms-related tyrosine kinase 3 ligand

Quizartinib, also know as AC220 and AC010220, is an orally available FLT3 STK1 inhibitor with potential antineoplastic activity. Class III receptor tyrosine kinase inhibitor AC220 selectively inhibits class III receptor tyrosine kinases, including FMS-related tyrosine kinase 3 (FLT3 STK1), colony-stimulating factor 1 receptor (CSF1R FMS), stem cell factor receptor (SCFR KIT), and platelet derived growth factor receptors (PDGFRs), resulting in inhibition of ligand-independent leukemic cell proliferation and apoptosis. Mutations in FLT3, resulting in constitutive activation, are the most frequent genetic alterations in acute myeloid leukemia (AML) and occur in approximately one-third of AML cases.

Quizartinib (AC220) 是一种第二代 Ⅱ 型 FLT3 酪氨酸激酶抑制剂，具有口服活性和高选择性，抑制 FLT3-WT 和 FLT3-ITD 自磷酸化 (IC50=4.1/1.1 nM)。Quizartinib 可以诱导肿瘤细胞凋亡。