The use of a first‐generation EGFR‐TKI was associated with occurrence of the T790M mutation, and re‐biopsy of the metastatic site showed a trend toward an association with a higher T790M mutation rate.
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Endobronchial ultrasound-guided re-biopsy of non-small cell lung cancer with acquired resistance after EGFR tyrosine kinase inhibitor treatment.
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