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. 2021 Jan 26;10:593852. doi: 10.3389/fonc.2020.593852

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Copyright © 2021 Zöchbauer-Müller, Kaserer, Prosch, Cseh, Solca, Bauer and Müllauer

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Insertion site of EGFR exon 20 insertion mutation. Sequencing electropherogram of EGFR exon 20 showing: (A) wild-type sequence of the adenocarcinoma from patient 1 resected in 2014; (B) duplication of a CAC base triplet in the adenocarcinoma from patient 1 biopsied in 2015. EGFR, epidermal growth factor receptor; CAC, cytosine adenine cytosine; (C) wild-type sequence of the adenocarcinoma from patient 2 resected in 2019; (D) duplication of a CAC base triplet in the adenocarcinoma from patient 2 biopsied in 2019.