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Primary epidermal growth factor receptor (EGFR) T790M mutation can be occasionally identified in previous untreated nonsmall cell lung cancer (NSCLC) patients. To compare clinical characteristics and outcomes in patients with primary and acquired EGFR T790M mutation, we collected the data of patients diagnosed with EGFR mutation from 2012 to 2017 in Shanghai Chest Hospital. Primary EGFR T790M mutation...
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