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Article

Presence of the minor EGFR T790M mutation is associated with drug-sensitive EGFR mutations in lung adenocarcinoma patients

  • Authors:
    • Shinsuke Hashida
    • Junichi Soh
    • Shinichi Toyooka
    • Tomoaki Tanaka
    • Masashi Furukawa
    • Kazuhiko Shien
    • Hiromasa Yamamoto
    • Hiroaki Asano
    • Kazunori Tsukuda
    • Koichi Hagiwara
    • Shinichiro Miyoshi
  • View Affiliations / Copyright

    Affiliations: Department of Thoracic Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Okayama 700-8558, Japan, Department of Respiratory Medicine, Saitama Medical University, Moroyama, Saitama 350-0495, Japan
  • Pages: 145-152
    |
    Published online on: May 16, 2014
       https://doi.org/10.3892/or.2014.3197
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Abstract

The T790M mutation in the epidermal growth factor receptor (EGFR) gene is known to be associated with the acquired resistance of lung adenocarcinoma patients to EGFR-tyrosine kinase inhibitors (EGFR-TKIs). The minor T790M mutant allele is occasionally detected in EGFR-TKI-naive tumor samples, yet findings concerning the clinical impact of the minor T790M mutation vary among previous studies. In the present study, we assessed the clinical impact of the minor T790M mutation using a novel, highly sensitive assay combining high-resolution melting (HRM), mutant-enriched PCR and co-amplification at a lower denaturation temperature (COLD)-PCR. We determined the T790M mutational status in 146 surgically resected lung adenocarcinomas without a history of EGFR-TKI treatment using mutant-enriched COLD-HRM (MEC-HRM) and standard HRM assays. The sensitivities of the MEC-HRM and standard HRM assays for the detection of T790M-mutant alleles among wild-type alleles were 0.01 and 10%, respectively. Although the T790M mutation was not detected using a standard HRM assay, we identified 19 (13%) T790M mutations using the MEC-HRM assay and defined these 19 mutations as minor T790M mutations. The proportion of T790M alleles was <0.1% in 17 (84%) of the 19 samples. Multivariate analyses revealed that a minor T790M mutation was significantly associated with the presence of EGFR exon 19 deletions or the L858R mutation (both of which are drug-sensitive EGFR mutations) (P=0.04). In conclusion, the minor EGFR T790M mutations were present in 13% of EGFR-TKI-naive surgically resected lung adenocarcinomas and were associated with drug-sensitive EGFR mutations.
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Copy and paste a formatted citation
Spandidos Publications style
Hashida S, Soh J, Toyooka S, Tanaka T, Furukawa M, Shien K, Yamamoto H, Asano H, Tsukuda K, Hagiwara K, Hagiwara K, et al: Presence of the minor EGFR T790M mutation is associated with drug-sensitive EGFR mutations in lung adenocarcinoma patients. Oncol Rep 32: 145-152, 2014.
APA
Hashida, S., Soh, J., Toyooka, S., Tanaka, T., Furukawa, M., Shien, K. ... Miyoshi, S. (2014). Presence of the minor EGFR T790M mutation is associated with drug-sensitive EGFR mutations in lung adenocarcinoma patients. Oncology Reports, 32, 145-152. https://doi.org/10.3892/or.2014.3197
MLA
Hashida, S., Soh, J., Toyooka, S., Tanaka, T., Furukawa, M., Shien, K., Yamamoto, H., Asano, H., Tsukuda, K., Hagiwara, K., Miyoshi, S."Presence of the minor EGFR T790M mutation is associated with drug-sensitive EGFR mutations in lung adenocarcinoma patients". Oncology Reports 32.1 (2014): 145-152.
Chicago
Hashida, S., Soh, J., Toyooka, S., Tanaka, T., Furukawa, M., Shien, K., Yamamoto, H., Asano, H., Tsukuda, K., Hagiwara, K., Miyoshi, S."Presence of the minor EGFR T790M mutation is associated with drug-sensitive EGFR mutations in lung adenocarcinoma patients". Oncology Reports 32, no. 1 (2014): 145-152. https://doi.org/10.3892/or.2014.3197
Copy and paste a formatted citation
x
Spandidos Publications style
Hashida S, Soh J, Toyooka S, Tanaka T, Furukawa M, Shien K, Yamamoto H, Asano H, Tsukuda K, Hagiwara K, Hagiwara K, et al: Presence of the minor EGFR T790M mutation is associated with drug-sensitive EGFR mutations in lung adenocarcinoma patients. Oncol Rep 32: 145-152, 2014.
APA
Hashida, S., Soh, J., Toyooka, S., Tanaka, T., Furukawa, M., Shien, K. ... Miyoshi, S. (2014). Presence of the minor EGFR T790M mutation is associated with drug-sensitive EGFR mutations in lung adenocarcinoma patients. Oncology Reports, 32, 145-152. https://doi.org/10.3892/or.2014.3197
MLA
Hashida, S., Soh, J., Toyooka, S., Tanaka, T., Furukawa, M., Shien, K., Yamamoto, H., Asano, H., Tsukuda, K., Hagiwara, K., Miyoshi, S."Presence of the minor EGFR T790M mutation is associated with drug-sensitive EGFR mutations in lung adenocarcinoma patients". Oncology Reports 32.1 (2014): 145-152.
Chicago
Hashida, S., Soh, J., Toyooka, S., Tanaka, T., Furukawa, M., Shien, K., Yamamoto, H., Asano, H., Tsukuda, K., Hagiwara, K., Miyoshi, S."Presence of the minor EGFR T790M mutation is associated with drug-sensitive EGFR mutations in lung adenocarcinoma patients". Oncology Reports 32, no. 1 (2014): 145-152. https://doi.org/10.3892/or.2014.3197
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