Figure. 6. The growth of A146T KRAS mutant xenografts was MEK-dependent.
A. Treatment of mice bearing established LS1034 xenografts with a single oral dose of PD0325901 (25 mg/kg) resulted in downregulation of pERK and cyclin D1 expression at 6 hours and upregulation of p27 at 24 hours. B. Mice with established LS1034 (A146T KRAS) xenografts were treated with PD0325901 (25 mg/kg 5x/week × 3 weeks) or vehicle only as control. (C). Mice were treated with 10 mg/kg of cetuximab or vehicle only as control twice weekly for three weeks.