NCIt definition : A change in the amino acid residue at position 681 in the platelet-derived growth
factor receptor beta protein where threonine has been replaced by isoleucine.;
NCIt note : This amino acid variation is located in the kinase domain (KD) of platelet-derived
growth factor receptor beta (PDGFRB). Tumors expressing this PDGFRB protein variant
or fusion proteins containing this PDGFRB KD variation may be resistant to imatinib
and dasatinib.;