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Published in: BMC Cancer 1/2017

Open Access 01-12-2017 | Research article

Efficacy of irreversible EGFR-TKIs for the uncommon secondary resistant EGFR mutations L747S, D761Y, and T854A

Authors: Masato Chiba, Yosuke Togashi, Eri Bannno, Yoshihisa Kobayashi, Yu Nakamura, Hidetoshi Hayashi, Masato Terashima, Marco A. De Velasco, Kazuko Sakai, Yoshihiko Fujita, Tetsuya Mitsudomi, Kazuto Nishio

Published in: BMC Cancer | Issue 1/2017

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Abstract

Background

Non-small cell lung cancer (NSCLC) harboring common epidermal growth factor receptor (EGFR) gene mutations (exon 19 deletion or exon 21 L858R) respond to EGFR tyrosine kinase inhibitors (EGFR-TKIs). The secondary T790 M mutation in exon 20 of the EGFR gene is the most common type of acquired resistance mutation. Several reports have also shown that other secondary mutations (L747S, D761Y and T854A), while uncommon, can induce acquired resistance to first-generation EGFR-TKIs. However, little is known about the anticancer activities of second- or third-generation EGFR-TKIs.

Methods

Uncommon secondary mutations were introduced into Ba/F3 cells along with the sensitive EGFR L858R mutation (Ba/F3-L858R/L747S, Ba/F3-L858R/D761Y, and Ba/F3-L858R/T854A), and the sensitivities to various EGFR-TKIs were then investigated.

Results

Both the Ba/F3-L858R/L747S and Ba/F3-L858R/D761Y cell lines exhibited weak resistances to first-generation reversible EGFR-TKIs, while the Ba/F3-L858R/T854A cell line exhibited a strong resistance. In contrast, irreversible EGFR-TKIs, especially third-generation EGFR-TKIs, were capable of overcoming these resistances. Western blot analyses demonstrated that gefitinib (first-generation) inhibited the phosphorylation of EGFR to a lesser extent in cells with these secondary mutations than in cells with the sensitive L858R mutation alone. In contrast, afatinib and osimertinib (second- and third-generation) inhibited the phosphorylation of EGFR in cells with these secondary mutations to a similar extent as that seen in cells with the sensitive L858R mutation alone.

Conclusions

Our experimental findings suggest that irreversible EGFR-TKIs, especially third-generation EGFR-TKIs, can be effective against uncommon secondary mutations and that switching to third-generation EGFR-TKIs could be a promising treatment strategy for patients with acquired resistance because of these uncommon secondary mutations.
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Metadata
Title
Efficacy of irreversible EGFR-TKIs for the uncommon secondary resistant EGFR mutations L747S, D761Y, and T854A
Authors
Masato Chiba
Yosuke Togashi
Eri Bannno
Yoshihisa Kobayashi
Yu Nakamura
Hidetoshi Hayashi
Masato Terashima
Marco A. De Velasco
Kazuko Sakai
Yoshihiko Fujita
Tetsuya Mitsudomi
Kazuto Nishio
Publication date
01-12-2017
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2017
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-017-3263-z

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