NCIt definition : The orally bioavailable mesylate salt of masatinib, a multi-targeted protein tyrosine
kinase inhibitor with potential antineoplastic activity. Masitinib selectively binds
to and inhibits both the wild-type and mutated forms of the stem cell factor receptor
(c-Kit; SCFR); platelet-derived growth factor receptor (PDGFR); fibroblast growth
factor receptor 3 (FGFR3); and, to a lesser extent, focal adhesion kinase (FAK). As
a consequence, tumor cell proliferation may be inhibited in cancer cell types that
overexpress these receptor tyrosine kinases (RTKs).;