AZD3229 Tosylate is a potent pan-KIT mutant inhibitor for the treatment of gastrointestinal stromal tumors. In Vitro AZD3229 is a potent, pan-KIT mutant inhibitor with potent single digit nM growth inhibition against a diverse panel of mutant KIT driven Ba/F3 cell lines (GI 50 =1-50 nM). AZD3229 demonstrates potent single digit nM growth inhibition across a broad cell panel, with good margin to KDR-driven effects. Selectivity over KDR can be rationalised predominantly by the interaction of water molecules with the protein and ligand in the active site and its kinome selectivity is similar to the best of the approved GIST agents. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Form:Solid IC50& Target:KIT