NSC-70220 is a selective and allosteric SOS1 inhibitor. NSC-70220 inhibits allosteric site activation, and partially inhibited catalytic site activation. NSC-70220 has an anticancer effect.IC50 & Target: SOS1.In Vitro: The growth inhibitory rate (IR)=(average OD value in the control group-average OD value in the treatment group)/average OD value in the control group×100% are compared. Treatments with NSC-70220 at 40 μM and NSC-658497 at 30 μM result in growth inhibitory rate of 29% and 8% respectively. The combination treatment results in growth inhibitory rate of 54%, showing the synergistic effect of NSC-70220 and NSC-658497 on cell growth inhibition. It is showed that the treatment with NSC-658497 at 40 μM for 2 hours alone or in combìnation with the treatment with 40 μM of NSC-70220 overnight resulted in lower expression levels of P-AKT and P-ERK. The treatment wlth 40 μM of NSC-70220 overnight resulted in lower expression levels of P-ERK.