XL228 is a protein kinase inhibitor targeting IGF1R, the AURORA kinases, FGFR1-3, ABL and SRC family kinases. XL228 is an Aurora A inhibitor (IC50, f3 nmol/L) that has shown potent biochemical activity against ABL1 (Ki, 5 nmol/L), as well as the BCR-ABL1 T315I (Ki, 1.4 nmol/L) kinases.