1. Academic Validation
  2. Antitumor activity and pharmacology of a selective focal adhesion kinase inhibitor, PF-562,271

Antitumor activity and pharmacology of a selective focal adhesion kinase inhibitor, PF-562,271

  • Cancer Res. 2008 Mar 15;68(6):1935-44. doi: 10.1158/0008-5472.CAN-07-5155.
Walter Gregory Roberts 1 Ethan Ung Pamela Whalen Beth Cooper Catherine Hulford Christofer Autry Daniel Richter Earling Emerson Jing Lin John Kath Kevin Coleman Lili Yao Luis Martinez-Alsina Marianne Lorenzen Martin Berliner Michael Luzzio Nandini Patel Erika Schmitt Susan LaGreca Jitesh Jani Matt Wessel Eric Marr Matt Griffor Felix Vajdos
Affiliations

Affiliation

  • 1 Pfizer Oncology, Groton, Connecticut, USA. robertswg@oncoviarx.com
Abstract

Cancer cells are characterized by the ability to grow in an anchorage-independent manner. The activity of the nonreceptor tyrosine kinase, focal adhesion kinase (FAK), is thought to contribute to this phenotype. FAK localizes in focal adhesion plaques and has a role as a scaffolding and signaling protein for other adhesion molecules. Recent studies show a strong correlation between increased FAK expression and phosphorylation status and the invasive phenotype of aggressive human tumors. PF-562,271 is a potent, ATP-competitive, reversible inhibitor of FAK and Pyk2 catalytic activity with a IC(50) of 1.5 and 14 nmol/L, respectively. Additionally, PF-562,271 displayed robust inhibition in an inducible cell-based assay measuring phospho-FAK with an IC(50) of 5 nmol/L. PF-562,271 was evaluated against multiple kinases and displays >100x selectivity against a long list of nontarget kinases. PF-562,271 inhibits FAK phosphorylation in vivo in a dose-dependent fashion (calculated EC(50) of 93 ng/mL, total) after p.o. administration to tumor-bearing mice. In vivo inhibition of FAK phosphorylation (>50%) was sustained for >4 hours with a single p.o. dose of 33 mg/kg. Antitumor efficacy and regressions were observed in multiple human s.c. xenograft models. No weight loss, morbidity, or mortality were observed in any in vivo experiment. Tumor growth inhibition was dose and drug exposure dependent. Taken together, these data show that kinase inhibition with an ATP-competitive small molecule inhibitor of FAK decreases the phospho-status in vivo, resulting in robust antitumor activity.

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