In Vitro: Theliatinib tartrate significantly inhibits EGFR phosphorylation in A431 cells with an IC50 of 7 nM. Theliatinib also inhibits A431, H292 and FaDu cells survival with IC50 values of 80 nM, 58 nM and 354 nM, respectively.
In Vivo: Theliatinib tartrate (2-15 mg/kg; oral administration;daily; for 21 days; NOD-SCID mice; PDECX 1T0950 model) treatment demonstrates tumor regression of 75% at the end of study, and with a dose response.