Bosutinib (hydrate) is an oral Src/Abl tyrosine kinase inhibito with IC 50 of 1.2 nM and 1 nM, respectively In Vitro Bosutinib (hydrate) is an active inhibitor of Bcr-Abl in several chronic myelogenous leukemia cell lines, with IC 50 values in the low nanomolar range. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Cell Proliferation AssayCell Line: The leukemic Bcr-Abl+ cell lines (KCL22, K562, KU812, and Lama84) Concentration: 0.1 μmol/L Incubation Time: 72 h Result: Inhibited several human CML derived cell lines with IC 50 values ranging from 1 to 20 nmol/L. In Vivo Bosutinib (hydrate) (oral gavage; 75 mg/kg twice daily or 150 mg/kg once daily) has activity against human KU812 xenografts in nude mice. Bosutinib (hydrate) (150 mg/kg; once daily, 5 days weekly) has activity against syngeneic Bcr-Abl WT and mutant Ba/F3 xenografts. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Animal Model: KU812CM L xenograft modelDosage: 75 mg/kg twice daily or 150 mg/kg once daily Administration: Bosutinib (oral gavage; 75 mg/kg twice daily or 150 mg/kg once daily) Result: Had the therapeutic activity and produced a dose- and schedule-dependent weight loss. Animal Model: Syngeneic Bcr-Abl WT and mutant Ba/F3 xenograftsDosage: 150 mg/kg Administration: Bosutinib (150 mg/kg; once daily, 5 days weekly) Result: Decreased the rate of tumor growth and prolonged event-free survival of mice. Form:Solid IC50& Target:IC50: 314 nmol/L (Csk, Src family protein tyrosine kinases),IC50: 2.4 nmol/L(Abl kinase).