Small-cell lung cancer with a rare epidermal growth factor receptor gene mutation showing "wax-and-wane" transformation.

Abstract excerpt

BACKGROUND: Small-cell lung cancer with epidermal growth factor receptor (EGFR) gene mutation typically manifests as a transformation occurring after EGFR tyrosine kinase inhibitor therapy for adenocarcinoma with EGFR mutation, whereas primary small-cell lung cancer showing EGFR mutation is extremely rare. Second biopsy of EGFR-mutated tumor has been broadly recognized as necessary, but is not always performed in...

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