Target Validation Information
Target ID T52624
Target Name Platelet-derived growth factor receptor
Target Type
Successful
Drug Potency against Target Sunitinib Drug Info IC50 = 1 nM [552495]
SU-6668 Drug Info Ki = 8 nM [552226]
BAY-57-9352 Drug Info Ki = 15 nM [552978]
Motesanib Drug Info IC50 = 84 nM [552773]
Imatinib Drug Info IC50 = 37 nM [552773]
TAK-593 Drug Info Ki = 4.3~13 nM [553086]
Nilotinib Drug Info Ki = 71 nM [552494]
TKI258 Drug Info IC50 = 9 nM [552773]
Axitinib Drug Info IC50 = 1.6 nM [552885]
Action against Disease Model Imatinib Most patients with de novo chronic myeloid leukemia (CML) achieve good responses to imatinib, but the rate and degree of molecular response is variable. We assessed the inhibitory concentration 50% for imatinib (IC50imatinib) in 62 patients with de novo chronic-phase CML as a predictor of molecular response. IC50imatinib was determined in pretherapy blood samples by measuring the in vitro imatinib-induced reduction of the phosphorylated form of the adaptor protein Crkl (CT10 regulator of kinase like). There was marked variability between patients, with IC50imatinib ranging from 0.375 to 1.8 microM (median, 0.6 microM). Patients with low IC50imatinib (IC50 < or = 0.6 microM; n = 36) had a 36% probability of achieving 2-log reduction in BCR-ABL (breakpoint cluster region-abelson) by 3 months compared with 8% in patients with high IC50imatinib (n = 26) (P = .01). The IC50imatinib was also predictive of molecular response at 12 months, with 47% of patients in the lowIC50imatinib group achieving 3-log reduction and 23% in the high IC50imatinib group (P = .03). The predictive power of IC50imatinib was particularly strong in patients with low Sokal scores. These data provide strong evidence that intrinsic sensitivity to imatinib is variable in previously untreated patients with CML, and the actual level of BCR-ABL kinase inhibition achieved is critical to imatinib response. The IC50imatinib potentially provides a new prognostic indicator for molecular response in patients treated with imatinib. [552528] Drug Info
Sunitinib IC50 in leukemia cell line Kas uMi-1: 75.7 nM [552789] Drug Info
References
Ref 552495A small molecule-kinase interaction map for clinical kinase inhibitors. Nat Biotechnol. 2005 Mar;23(3):329-36. Epub 2005 Feb 13.
Ref 552226SU6668 is a potent antiangiogenic and antitumor agent that induces regression of established tumors. Cancer Res. 2000 Aug 1;60(15):4152-60.
Ref 552978An overview of small-molecule inhibitors of VEGFR signaling. Nat Rev Clin Oncol. 2009 Oct;6(10):569-79. doi: 10.1038/nrclinonc.2009.130. Epub 2009 Sep 8.
Ref 552773A quantitative analysis of kinase inhibitor selectivity. Nat Biotechnol. 2008 Jan;26(1):127-32. doi: 10.1038/nbt1358.
Ref 552773A quantitative analysis of kinase inhibitor selectivity. Nat Biotechnol. 2008 Jan;26(1):127-32. doi: 10.1038/nbt1358.
Ref 553086Biochemical characterization of TAK-593, a novel VEGFR/PDGFR inhibitor with a two-step slow binding mechanism. Biochemistry. 2011 Feb 8;50(5):738-51. doi: 10.1021/bi101777f. Epub 2011 Jan 10.
Ref 552528In vitro sensitivity to imatinib-induced inhibition of ABL kinase activity is predictive of molecular response in patients with de novo CML. Blood. 2005 Oct 1;106(7):2520-6. Epub 2005 Jun 14.
Ref 552494Characterization of AMN107, a selective inhibitor of native and mutant Bcr-Abl. Cancer Cell. 2005 Feb;7(2):129-41.
Ref 552773A quantitative analysis of kinase inhibitor selectivity. Nat Biotechnol. 2008 Jan;26(1):127-32. doi: 10.1038/nbt1358.
Ref 552885Nonclinical antiangiogenesis and antitumor activities of axitinib (AG-013736), an oral, potent, and selective inhibitor of vascular endothelial growth factor receptor tyrosine kinases 1, 2, 3. Clin Cancer Res. 2008 Nov 15;14(22):7272-83. doi: 10.1158/1078-0432.CCR-08-0652.
Ref 552789Initial testing (stage 1) of sunitinib by the pediatric preclinical testing program. Pediatr Blood Cancer. 2008 Jul;51(1):42-8. doi: 10.1002/pbc.21535.

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