AS-604850 is a selective, ATP-competitive inhibitor of PI3Kγ with IC50 values of 0.25, >20, >20, and 4.5 µM for the human recombinant γ, .delta., β, and α isoforms, respectively. AS-604850 inhibited MCP-1-mediated monocyte chemotaxis with an IC50 value of 21 µM and reduced RANTES-induced peritoneal neutrophil recruitment in a murine model of leukocyte chemotaxis with an ED50 value of 42.4 mg/kg.