Focal adhesion kinases (FAKs) are non-receptor tyrosine kinases that play roles in regulating diverse processes, including cell adhesion, spreading, migration, proliferation, and apoptosis. They are overexpressed in many types of cancer. PF-573228 inhibits FAK with IC50 values of 4 and 30-100 nM for a purified recombinant catalytic fragment of FAK and in cultured cells, respectively. It is 50-250-fold selective for FAK over other protein kinases. PF-573228 can inhibit chemotactic and haptotactic migration of cells as well as prevent focal adhesion turnover.
