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Crenolanib (CP-868596) is a potent, specific, and orally available inhibitor of PDGFRα, PDGFRβ and FLT3 with inhibitor-binding constant (Kd) of 3.2, 2.1, and 0.74 nM, respectively [1].

It has been shown that crenolanib is more potent than quizartinib and sorafenib at blocking FLT3 autophosphorylation and causing cytotoxicity [2]. Crenolanib is confirmed to be100-fold more potent than imatinib at suppressing D842V mutation. In addition, it has been reported that crenolanib inhibits PDGFRα D842V mutation rather than V561D mutation, with IC50 value of 10 nM [1]. In EOL-1 cells, crenolanib also inhibits the FIP1L1-PDGFRA fusion kinase activity (IC50=1 nM) and cell proliferation (IC50= 0.2 pM)[1].

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