NCIt definition : The hydrochloride salt form of pexidartinib, a small-molecule receptor tyrosine kinase
(RTK) inhibitor of proto-oncogene receptor tyrosine kinase (KIT), colony-stimulating
factor-1 receptor (CSF1R) and FMS-like tyrosine kinase 3 (FLT3), with antineoplastic
activity. Upon oral administration, pexidartinib targets, binds to and inhibits phosphorylation
of KIT, CSF1R and FLT3 harboring an internal tandem duplication (ITD) mutation. This
results in the inhibition of tumor cell proliferation. FLT3, CSF1R and FLT3 are overexpressed
or mutated in many cancer cell types and play major roles in tumor cell proliferation
and metastasis.;