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• W2272081149 abstract "Abstract Purpose: Activation of MET oncogene as the result of amplification or activation mutation represents an emerging molecular target for cancer treatment. We comprehensively studied MET alterations and the clinicopathologic correlations in a large cohort of treatment-naïve non–small cell lung carcinoma (NSCLC). Experimental Design: Six hundred eighty-seven NSCLCs were tested for MET exon 14 splicing site mutation (METΔ14), DNA copy number alterations, and protein expression by Sanger sequencing, FISH, and IHC, respectively. Results: METΔ14 mutation was detected in 2.62% (18/687) of NSCLC. The mutation rates were 2.6% in adenocarcinoma, 4.8% in adenosquamous carcinoma, and 31.8% in sarcomatoid carcinoma. METΔ14 mutation was not detected in squamous cell carcinoma, large cell carcinoma, and lymphoepithelioma-like carcinoma but significantly enriched in sarcomatoid carcinoma (P &lt; 0.001). METΔ14 occurred mutually exclusively with known driver mutations but tended to coexist with MET amplification or copy number gain (P &lt; 0.001). Low-level MET amplification and polysomy might occur in the background of EGFR or KRAS mutation whereas high-level amplification (MET/CEP7 ratio ≥5) was mutually exclusive to the major driver genes except METΔ14. Oncogenic METΔ14 mutation and/or high-level amplification occurred in a total of 3.3% (23/687) of NSCLC and associated with higher MET protein expression. METΔ14 occurred more frequently in older patients whereas amplification was more common in ever-smokers. Both METΔ14 and high-level amplification were independent prognostic factors that predicted poorer survival by multivariable analysis. Conclusions: The high incidence of METΔ14 mutation in sarcomatoid carcinoma suggested that MET inhibition might benefit this specific subgroup of patients. Clin Cancer Res; 22(12); 3048–56. ©2016 AACR. See related commentary by Drilon, p. 2832" @default.
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• W2272081149 date "2016-06-14" @default.
• W2272081149 modified "2023-10-11" @default.
• W2272081149 title "<i>MET</i> Amplification and Exon 14 Splice Site Mutation Define Unique Molecular Subgroups of Non–Small Cell Lung Carcinoma with Poor Prognosis" @default.
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• W2272081149 doi "https://doi.org/10.1158/1078-0432.ccr-15-2061" @default.
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