GDC-0994 is a potent and selective ERK1 and ERK2 inhibitor with IC50 values of 6.1 and 4.1 nM, respectively. It inhibits ERK-dependent p90RSK serine 380 phosphorylation in PMA-stimulated HepG2 cells with an IC50 value of 12 nM. GDC-0994 inhibited growth of HCT116 human colorectal cancer xenograft tumors by 49%, 57%, and 80% at 30, 60, and 100 mg/kg, respectively, when administered orally once daily for 21 days.
