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Exploring the resistance mechanisms of second-line osimertinib and their prognostic implications using next-generation sequencing in patients with non-small-cell lung cancer

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Abstract
Introduction: Although osimertinib overcomes the T790M mutation acquired after traditional epidermal growth factor receptor (EGFR) gene tyrosine kinase inhibitor (TKI) treatment, resistance to osimertinib eventually occurs. We explored resistance mechanisms of second-line osimertinib and their clinical implications by comparing next-generation sequencing (NGS) results before and after resistance acquisition. Methods: We enrolled 34 patients with advanced EGFR-mutant adenocarcinoma whose biopsied tumour tissues were subjected to targeted NGS at the time of progression on osimertinib. For comparison, NGS was also performed on archived tumour tissues from each patient excised before osimertinib initiation. Results: The tumours of three patients? were observed to have transformed to small-cell carcinoma and those of two patients to squamous cell carcinoma. Among the remaining 29 patients, T790M mutations were maintained in seven patients (24.1%), including four patients (13.8%) acquiring C797S mutations and one with MET amplification. Among the 22 patients (75.9%) with T790M loss, a variety of novel mutations were identified, including KRAS mutations, PIK3CA mutations, and RET fusion, but MET amplifications (n Z 4, 18.2%) were
Author(s)
김덕훈김상위윤신교이경민이대호
Issued Date
2021
Type
Article
Keyword
GenomicsHigh-throughput nucleotide sequencingMET amplificationOsimertinibResistanceT790M mutation
DOI
10.1016/j.ejca.2021.01.052
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8146
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_proquest_miscellaneous_2503660137&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Exploring%20the%20resistance%20mechanisms%20of%20second-line%20osimertinib%20and%20their%20prognostic%20implications%20using%20next-generation%20sequencing%20in%20patients%20with%20non-small-cell%20lung%20cancer&offset=0&pcAvailability=true
Publisher
EUROPEAN JOURNAL OF CANCER
Location
영국
Language
영어
ISSN
0959-8049
Citation Volume
148
Citation Number
0
Citation Start Page
202
Citation End Page
210
Appears in Collections:
Medicine > Medicine
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