Abstract
Tyrosine kinase inhibitor (TKI) therapy results in excellent responses in the majority of patients with chronic myeloid leukaemia. First-line imatinib treatment, with selective switching to nilotinib when patients fail to meet specific molecular targets or for imatinib intolerance, results in excellent overall molecular responses and survival. However, this strategy is less effective in cases of primary imatinib resistance; moreover, 25% of patients develop secondary resistance such that 20–35% of patients initially treated with imatinib will eventually experience treatment failure. Early identification of these patients is of high clinical relevance. Since the drug efflux transporter ABCB1 has previously been implicated in TKI resistance, we determined if early increases in ABCB1 mRNA expression (fold change from diagnosis to day 22 of imatinib therapy) predict for patient response. Indeed, patients exhibiting a high fold rise (⩾2.2, n=79) were significantly less likely to achieve early molecular response (BCR-ABL1IS ⩽10% at 3 months; P=0.001), major molecular response (P<0.0001) and MR4.5 (P<0.0001). Additionally, patients demonstrated increased levels of ABCB1 mRNA before the development of mutations and/or progression to blast crisis. Patients with high fold rise in ABCB1 mRNA were also less likely to achieve major molecular response when switched to nilotinib therapy (49% vs 82% of patients with low fold rise). We conclude that early evaluation of the fold change in ABCB1 mRNA expression may identify patients likely to be resistant to first- and second-generation TKIs and who may be candidates for alternative therapy.
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LNE, PD, VAS, MPO and APG have no conflict of interest to declare. DTY, TPH and DLW receive honoraria and research funds from Novartis Pharmaceuticals, and are members of Advisory Boards for Novartis. DTY and TPH are chairs of the CML/MPN disease group for the Australasian Leukaemia and Lymphoma Group (ALLG). Neither Novartis nor ALLG had roles in the design of the study, collection and analysis of the data or the decision to publish.
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LNE designed the experiments, performed the experiments, analysed the data, wrote the manuscript and created the figures. PD performed the experiments and reviewed the manuscript. VAS coordinated patient samples and reviewed the manuscript. DTY and MPO supervised conduct of TIDEL II, contributed patients and reviewed the manuscript. APG designed TIDEL II, supervised conduct of TIDEL II, contributed patients, served on the TIDEL II management committee and reviewed the paper. TPH designed the experiments, designed TIDEL II, supervised conduct of TIDEL II, contributed patients, served on the TIDEL II management committee and reviewed the paper. DLW designed the experiments, analysed the data, created the figures and reviewed the manuscript.
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Eadie, L., Dang, P., Saunders, V. et al. The clinical significance of ABCB1 overexpression in predicting outcome of CML patients undergoing first-line imatinib treatment. Leukemia 31, 75–82 (2017). https://doi.org/10.1038/leu.2016.179
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DOI: https://doi.org/10.1038/leu.2016.179
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