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Masitinib is a member of the class of benzamides that is the carboxamide resulting from the formal condensation of the carboxy group of 4-[(4-methylpiperazin-1-yl)methyl]benzoic acid with the primary amino group of 4-methyl-N(3)-[4-(pyridin-3-yl)-1,3-thiazol-2-yl]benzene-1,3-diamine. It is a highly selective oral tyrosine kinase inhibitor. It has a role as a tyrosine kinase inhibitor, an antineoplastic agent and an antirheumatic drug. It is a N-alkylpiperazine, a member of 1,3-thiazoles, a member of pyridines and a member of benzamides. Masitinib is a tyrosine-kinase inhibitor used in the treatment of mast cell tumors in dogs. It has been available in Europe since 2009, under the brand name Masivet. In the USA it is distributed under the name Kinavet and has been available for veterinaries since 2011. Masitinib is a multi-targeted protein tyrosine kinase inhibitor, with potential antineoplastic activity. Upon administration, 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).

A member of the class of benzamides that is the carboxamide resulting from the formal condensation of the carboxy group of 4-[(4-methylpiperazin-1-yl)methyl]benzoic acid with the primary amino group of 4-methyl-N(3)-[4-(pyridin-3-yl)-1,3-thiazol-2-yl]benzene-1,3-diamine. It is a highly selective oral tyrosine kinase inhibitor." []