A selective FGFR inhibitor PD-161570 is a selective FGFR inhibitor (IC50 values are 40, 262 and 3700 nM for FGFR, PDGFR and EGFR respectively). PD 161570 inhibits FGFR receptor phosphorylation (IC50 = 622 nM) and growth of A121 cells in vitro. PD-161570 is a selective FGFR inhibitor (IC50 values are 40, 262 and 3700 nM for FGFR, PDGFR and EGFR respectively). PD 161570 inhibits FGFR receptor phosphorylation (IC50 = 622 nM) and growth of A121 cells in vitro. A selective FGFR inhibitor