Lung adenocarcinoma in a patient with a cis EGFR L858R-K860I doublet mutation identified using NGS-based profiling test: Negative diagnosis on initial companion test and successful treatment with osimertinib.

Abstract:

:Tyrosine kinase inhibitors are used as first-line treatment for non-small cell lung cancer (NSCLC) patients harboring driver mutations in EGFR, ALK, ROS1, and BRAF. Currently, standard molecular testing approaches help identify single genes for such targetable driver mutations in NSCLC; however, next-generation sequencing (NGS)-based genetic profiling provides a more comprehensive approach and is hence strongly recommended. This case study aimed to highlight the benefits of NGS-based tests for the diagnosis of complex EGFR L858R mutations. A patient was diagnosed with stage IVB NSCLC using a government-approved in vitro diagnostic test and was noted to have a high programmed death-ligand 1 tumor proportion score. This patient was treated with pembrolizumab monotherapy followed by cisplatin and pemetrexed owing to the lack of actionable driver gene mutations, including EGFR mutations. After treatment failure, a sample harvested from the same transbronchial lung biopsy specimen (formalin-fixed and paraffin-embedded) used for the initial EGFR test was subjected to NGS-based broad genetic profiling. The NGS-based test identified an EGFR L858R-K860I cis doublet mutation; however, neither of these mutations was identified upon initial molecular testing. The patient was then successfully treated with a third-generation EGFR-tyrosine kinase inhibitor, osimertinib. In this study, we delved deeper into the realm of L858R and K860I mutations in NSCLC and discuss the potential causes underlying our initial negative diagnosis. Furthermore, this study highlighted the additional benefits of replacing typical molecular tests with NGS-based broad profiling approaches. KEY POINTS: SIGNIFICANT FINDINGS OF THE STUDY: The EGFR L858R-K860I cis doublet mutation was not detected by a PCR-based EGFR test. A next generation sequencing (NGS)-based test was able to identify the L858R-K860I cis doublet mutation. WHAT THIS STUDY ADDS: Osimertinib was effective in an NSCLC patient with EGFR L858R and K860I mutations.

journal_name

Thorac Cancer

journal_title

Thoracic cancer

authors

Onozawa H,Saito H,Sunami K,Kubo T,Yamamoto N,Kasajima R,Ohtsu T,Hiroshima Y,Kanamori H,Yokose T,Miyagi Y

doi

10.1111/1759-7714.13694

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

3599-3604

issue

12

eissn

1759-7706

issn

1759-7714

journal_volume

11

pub_type

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