PLX-647 is PLX647 is a potent inhibitors of both FMS and KIT that show strong selectivity compared with other kinases. In the in vitro enzymatic assay, PLX647 inhibits FMS with IC50 = 0.028μM and KIT with IC50 = 0.016 μM. PLX647 represents a unique class of kinase inhibitors with unique dual FMS and KIT specificity.