Abstract:
:Chronic myeloid leukemia is effectively treated with imatinib, but reactivation of BCR-ABL frequently occurs through acquisition of kinase domain mutations. The additional approved ABL tyrosine kinase inhibitors (TKIs) nilotinib and dasatinib, along with investigational TKIs such as ponatinib (AP24534) and DCC-2036, support the possibility that mutation-mediated resistance in chronic myeloid leukemia can be fully controlled; however, the molecular events underlying resistance in patients lacking BCR-ABL point mutations are largely unknown. We previously reported on an insertion/truncation mutant, BCR-ABL(35INS), in which structural integrity of the kinase domain is compromised and all ABL sequence beyond the kinase domain is eliminated. Although we speculated that BCR-ABL(35INS) is kinase-inactive, recent reports propose this mutant contributes to ABL TKI resistance. We present cell-based and biochemical evidence establishing that BCR-ABL(35INS) is kinase-inactive and does not contribute to TKI resistance, and we find that detection of BCR-ABL(35INS) does not consistently track with or explain resistance in clinical samples from chronic myeloid leukemia patients.
journal_name
Bloodjournal_title
Bloodauthors
O'Hare T,Zabriskie MS,Eide CA,Agarwal A,Adrian LT,You H,Corbin AS,Yang F,Press RD,Rivera VM,Toplin J,Wong S,Deininger MW,Druker BJdoi
10.1182/blood-2011-05-349191subject
Has Abstractpub_date
2011-11-10 00:00:00pages
5250-4issue
19eissn
0006-4971issn
1528-0020pii
blood-2011-05-349191journal_volume
118pub_type
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