CEP-40783

Biological Activity

CEP-40783 (RXDX-106) is a potent, selective and orally available inhibitor of AXL and c-Met with IC50 values of 7 nM and 12 nM, respectively. CEP-40783 shows dose- and time-dependent inhibition of AXL phosphorylation using NCI-H1299 NSCL xenografts with 80% target inhibition at 0.3 mg/kg 6 h post dose and complete target inhibition to >90% inhibition at 1 mg/kg between 6-24 h, while a 10 mg/kg po dose resulted in complete AXL inhibition up to 48 h post dosing. In 3/5 (60%) of the tumor models, CEP-40783 shows in vivo efficacy, including tumor regressions, significantly superior to that achieved with an optimal regimen of paclitaxel. In 4/4 (100%) of the erlotinib-insensitive tumor models, CEP-40783 demonstrates significant efficacy (66 to 118% TGI) compared to the control group at the 30 mg/kg dose.

Protocol

Cell Experiment
Cell lines	3T3 cells
Preparation method	3T3 cells expressing Tyro3, Axl, or Mer are incubated with vehicle alone or CEP-40783 for 30 minutes, and receptor phosphorylation is monitored.
Concentrations	0.25, 1, 2.5, 10, 25, 100, 250 nM
Incubation time	30 min

Animal Experiment
Animal models	SCID Beige mice
Formulation
Dosages	30 mg/kg
Administration	p.o.

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

Species	Mouse	Rat	Rabbit	Guinea pig	Hamster	Dog
Weight (kg)	0.02	0.15	1.8	0.4	0.08	10
Body Surface Area (m2)	0.007	0.025	0.15	0.05	0.02	0.5
Km factor	3	6	12	8	5	20

Animal A (mg/kg) = Animal B (mg/kg) multiplied by	Animal B Km
	Animal A Km

For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the K_m factor for a mouse and then divide by the K_m factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.

Chemical Information