Squamous-cell transformation in a patient with lung adenocarcinoma receiving erlotinib: Co-occurrence with T790M mutation
2015
Abstract We report on a patient with metastatic lung adenocarcinoma who underwent testing for EGFR mutations in a
pleural effusionthat failed to show any alterations and received standard first and second-line chemotherapy. She received
erlotinibas
third-line therapywith a prolonged partial response. At time of progression, re-biopsy showed squamous cell carcinoma, supported by histology and immunohistochemistry. Molecular profiling confirmed EGFR exon 21 L858R and exon 20
T790Mmutations. Squamous cell transformation should not
deferEGFR re-sequencing.
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