Mesenchymal-epithelial transition (MET) amplification is a rare gene alteration in lung cancer. The aim of this study was to investigate the clinical characteristics of MET amplification in lung cancer and the response to crizotinib by subsets of patients with MET amplification detected by next-generation sequencing (NGS).
We collected NGS sequencing data for patients with MET amplification in our institution from January 2018 to April 2019. The efficacy of crizotinib in MET amplification was retrospectively analyzed.
A total of 2694 patients received NGS tests, 3.27 % (82/2507) of patients had primary MET amplification, and acquired MET amplification accounted for 16.04 % (30/187) of re-biopsy patients. Only 19 patients received monotherapy with crizotinib. In survival analysis, ten patients with copy number greater than 4 (CN > 4) had longer median PFS (mPFS) (4.76 months; 95 %CI: 1.67-7.85 months) compared with other nine patients (CN ≤ 4) (2.10 months; 95 %CI: 1.53-2.68 months; P = 0.063), but failed to get a statistical significance. No significant differences were observed between median PFS (mPFS) of the patients with primary and acquired MET amplification (4.04 months vs 2.76 months; P = 0.310).
Primary and acquired MET amplification were detected in 3.27 % and 16.04 % of lung cancer patients, respectively. Patients with CN > 4 seemed to have longer PFS after crizotinib treatment. No significant differences in PFS were observed between patients with primary and acquired MET amplification.

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