I Dagogo-Jack1, A T Shaw2. 1. Department of Medicine, Massachusetts General Hospital Cancer Center, Boston, USA. 2. Department of Medicine, Massachusetts General Hospital Cancer Center, Boston, USA ashaw1@partners.org.
Abstract
In 2007, a chromosomal rearrangement resulting in a gene fusion leading to expression of a constitutively active anaplastic lymphoma kinase (ALK) fusion protein was identified as an oncogenic driver in non-small-cell lung cancer (NSCLC). ALK rearrangements are detected in 3%-7% of patients with NSCLC and are particularly enriched in younger patients with adenocarcinoma and a never or light smoking history. Fortuitously, crizotinib, a small molecule tyrosine kinase inhibitor initially developed to target cMET, was able to be repurposed for ALK-rearranged (ALK+) NSCLC. Despite dramatic and durable initial responses to crizotinib; however, the vast majority of patients will develop resistance within a few years. Diverse molecular mechanisms underlie resistance to crizotinib. This review will describe the clinical activity of crizotinib, review identified mechanisms of crizotinib resistance, and end with a survey of emerging therapeutic strategies aimed at overcoming crizotinib resistance.
In 2007, a chromosomal rearrangement resulting in a gene fusion leading to expression of a constitutively active anaplastic lymphoma kinase (ALK) fusion protein was identified as an oncogenic driver in non-small-cell lung cancer (NSCLC). ALK rearrangements are detected in 3%-7% of patients with NSCLC and are particularly enriched in younger patients with adenocarcinoma and a never or light smoking history. Fortuitously, crizotinib, a small molecule tyrosine kinase inhibitor initially developed to target cMET, was able to be repurposed for ALK-rearranged (ALK+) NSCLC. Despite dramatic and durable initial responses to crizotinib; however, the vast majority of patients will develop resistance within a few years. Diverse molecular mechanisms underlie resistance to crizotinib. This review will describe the clinical activity of crizotinib, review identified mechanisms of crizotinib resistance, and end with a survey of emerging therapeutic strategies aimed at overcoming crizotinib resistance.
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