BSc5371 is a potent and irreversible FLT3 inhibitor (Kds: 1.3, 0.83, 1.5, 5.8, and 2.3 nM for mutant FLT3 D835H, FLT3 ITD D835V, FLT3 ITD F691L, FLT3-ITD, and wild type FLT3 wt).
RET-IN-4 is a highly effective and specific RET inhibitor that can be administered orally. It demonstrates remarkable potency, with IC50 values of 1.29 nM, 1.97 nM, and 0.99 nM for inhibiting RET variants including RET (WT), RET (V804M), and RET (M918T), respectively. Moreover, RET-IN-4 exhibits superior selectivity towards kinases JAK2 (IC50 of 4.4 nM) and FLT3 (IC50 of 30.8 nM). Additionally, RET-IN-4 possesses pronounced anticancer properties.
FI-700 is a novel and potent FLT3 inhibitor with promising antileukemia activity. FI-700 showed a potent IC(50) value against FLT3 kinase at 20 nmol L in an in vitro kinase assay. FI-700 showed selective growth inhibition against mutant FLT3-expressing leukemia cell lines and primary acute myeloid leukemia cells, whereas it did not affect the FLT3 ligand (FL)-driven growth of Wt-FLT3-expressing cells. Oral administration of FI-700 induced the regression of tumors in a s.c. tumor xenograft model and increased the survival of mice in an i.v. transplanted model. Furthermore, FI-700 treatment eradicated FLT3 ITD-expressing leukemia cells, both in the peripheral blood and in the bone marrow. (Source: Clin Cancer Res. 2007 Aug 1;13(15 Pt 1):4575-82.)