Clin Lung Cancer 2016 Nov 01;176:474-482. doi: 10.1016/j.cllc.2016.05.006.

Management of Resistance to Crizotinib in Anaplastic Lymphoma Kinase-Positive Non-Small-cell Lung Cancer.

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During the past decade, the recognition of an ever-expanding list of driver oncogenic mutations in non-small-cell lung cancer has resulted in rapid therapeutic advances. Since the first description of the echinoderm microtubule-associated protein-like 4 anaplastic lymphoma kinase (EML4-ALK) rearrangement in 4% of cases of non-small-cell lung cancer in 2007, a highly potent and selective ALK inhibitor, crizotinib, was developed and approved in record time. However, it soon became apparent that although the responses can be dramatic and durable and primary intrinsic resistance to crizotinib is uncommon, the emergence of secondary resistance is inevitable. Efforts to elucidate the specific mechanisms that confer acquired resistance to crizotinib are underway. These have led to the recognition of the role of secondary resistance mutations, of ALK amplification, and of activation of bypass signaling, all of which contribute to resistance to crizotinib. Moreover, the rapid preclinical and clinical development of multiple second-generation ALK inhibitors that exhibit significant clinical activity against crizotinib-resistant disease has provided multiple options to treating physicians, with the ultimate goal the delivery of tailored medicine.

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