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CAS number 950769-58-1 YesY
ChemSpider 24640357 N
Jmol-3D images Image 1
Molecular formula C29H32N6O4S
Molar mass 560.67 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Quizartinib (AC220) is a small molecule receptor tyrosine kinase inhibitor that is currently under development by Ambit Biosciences for the treatment of acute myeloid leukaemia. Its molecular target is FLT3, also known as CD135 which is a proto-oncogene.[1]

Flt3 mutations are among the most common mutations in acute myeloid leukaemia due to internal tandem duplication of Flt3. The presence of this mutation is a marker of adverse outcome.


Specifically, Quizartinib selectively inhibits class III receptor tyrosine kinases, including FMS-related tyrosine kinase 3 (FLT3/STK1), colony-stimulating factor 1 receptor (CSF1R/FMS), stem cell factor receptor (SCFR/KIT), and platelet derived growth factor receptors (PDGFRs).[citation needed]

Mutations cause constitutive action of Flt3 leading to resulting in inhibition of ligand-independent leukemic cell proliferation and apoptosis.[citation needed]

Clinical trials[edit]

It had good results in a phase II clinical trial for refractory AML - particularly in patients who went on to have a stem cell transplant.[2]


  1. ^ Chao, Qi; Sprankle, Kelly G.; Grotzfeld, Robert M.; Lai, Andiliy G.; Carter, Todd A.; Velasco, Anne Marie; Gunawardane, Ruwanthi N.; Cramer, Merryl D.; Gardner, Michael F.; James, Joyce; Zarrinkar, Patrick P.; Patel, Hitesh K.; Bhagwat, Shripad S. (2009). "Identification of N-(5-tert-Butyl-isoxazol-3-yl)-N'-{4-[7-(2-morpholin-4-yl-ethoxy)imidazo[2,1-b][1,3]benzothiazol-2-yl]phenyl}urea Dihydrochloride (AC220), a Uniquely Potent, Selective, and Efficacious FMS-Like Tyrosine Kinase-3 (FLT3) Inhibitor". Journal of Medicinal Chemistry 52 (23): 7808–7816. doi:10.1021/jm9007533. 
  2. ^ Drug Tames Refractory AML. ASH Dec 2012