A cautionary lesson on the use of targeted methods for EGFR mutation analysis: a case report

K Walsh, W A Wallace, R Butler, M J Mackean, D J Harrison, D Stirling, Anca Oniscu

Research output: Contribution to journalArticlepeer-review

Abstract

Epidermal growth factor receptor (EGFR) mutation analysis is recommended for lung cancer patients prior to the prescription of first-line EGFR tyrosine kinase inhibitors in order to predict response to treatment. There are many methods available to identify mutations in the EGFR gene; a large number of clinical laboratories use the therascreen EGFR RGQ PCR kit (Qiagen). We report a case where this kit detected an exon 19 deletion, predicting sensitivity to tyrosine kinase inhibitors (TKIs), which on further analysis was found to be a 2 bp indel (c.2239_2240delinsCC, p.(Leu747Pro)). Two of four published cases with this mutation were found to be associated with resistance to EGFR TKI. The sample was also tested using two other commercial kits, one of which indicated a deletion. This is a rare mutation making the erroneous detection of a deletion unlikely; however, it is important that clinical laboratories are aware of the potential failings of two commercial kits for EGFR mutation analysis.

Original languageEnglish
Pages (from-to)734-5
Number of pages2
JournalJournal of Clinical Pathology
Volume67
Issue number8
DOIs
Publication statusPublished - Aug 2014

Keywords

  • Adenocarcinoma
  • Antineoplastic Agents
  • DNA Mutational Analysis
  • Humans
  • Lung Neoplasms
  • Protein Kinase Inhibitors
  • Receptor, Epidermal Growth Factor

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