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Clinical Outcome According to the Level of Preexisting Epidermal Growth Factor Receptor T790M Mutation in Patients With Lung Cancer Harboring Sensitive Epidermal Growth Factor Receptor Mutations

Authors
 Youngjoo Lee  ;  Geon Kook Lee  ;  Yeon-Su Lee  ;  Wenji Zhang  ;  Jung-Ah Hwang  ;  Byung-Ho Nam  ;  Seok Hyun Kim  ;  Joo-Hang Kim  ;  Tak Yun  ;  Ji-Youn Han  ;  Heung Tae Kim  ;  Jin Soo Lee 
Citation
 Cancer, Vol.120(14) : 2090-2098, 2014 
Journal Title
 Cancer 
ISSN
 0008-543X 
Issue Date
2014
Abstract
BACKGROUND: Epidermal growth factor receptor (EGFR) T790M mutation drives acquired drug resistance to EGFR tyrosine kinase inhibitors (EGFR-TKIs) in patients with EGFR-mutant lung cancer. However, it was reported that this mutation may exist before drug exposure. The objective of the current study was to evaluate whether the clinical outcomes are affected by the percentage of preexisting T790M mutations within a tumor. METHODS: Pretreatment tissues were collected from 124 patients with advanced non-small cell lung cancer with sensitizing EGFR mutations that were detected by direct sequencing. Genotyping for EGFR T790M mutation was further performed using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Patients who were positive for the T790M mutation were divided to 2 subgroups according to T790M mutant signal frequency. RESULTS: The T790M mutation was found in 31 patients (25.0%). The T790M mutation frequency at which the risk of disease progression after therapy with EGFR-TKIs begins to increase was estimated to be 3.2%. The patients with T790M-positive tumors had a shorter time to disease progression after treatment with EGFR-TKIs (median, 6.3 months vs 11.5 months; P < .001) and overall survival (median, 16.1 months vs 26.5 months; P = .065) compared with those with T790M-negative tumors. Among the T790M-positive patients, the patients with high T790M frequency (9 patients) were found to have a shorter time to disease progression (median, 2.4 months vs 6.7 months; P = .009) and overall survival (median, 9.1 months vs 18.7 months; P = .018) compared with those with low T790M frequency (22 patients). CONCLUSIONS: A preexisting EGFR T790M mutation was noted in 25% of patients with EGFR-mutant lung cancer. Patients with a high T790M mutation frequency had worse clinical outcomes to EGFR-TKIs than patients with a low T790M mutation frequency.
Full Text
http://onlinelibrary.wiley.com/doi/10.1002/cncr.28711/abstract
DOI
10.1002/cncr.28711
Appears in Collections:
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실)
Yonsei Authors
김주항(Kim, Joo Hang)
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/99577
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