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Article

Dual blockade of EGFR tyrosine kinase using osimertinib and afatinib eradicates EGFR‑mutant Ba/F3 cells

  • Authors:
    • Kimio Yonesaka
    • Yoshihisa Kobayashi
    • Hidetoshi Hayashi
    • Yasutaka Chiba
    • Tetsuya Mitsudomi
    • Kazuhiko Nakagawa
  • View Affiliations / Copyright

    Affiliations: Department of Medical Oncology, Kindai University Faculty of Medicine, Osaka‑Sayama, Osaka 589‑8511, Japan, Department of Thoracic Surgery, Kindai University Faculty of Medicine, Osaka‑Sayama, Osaka 589‑8511, Japan, Clinical Research Center, Kindai University Hospital, Osaka‑Sayama, Osaka 589‑8511, Japan
  • Pages: 1059-1066
    |
    Published online on: November 22, 2018
       https://doi.org/10.3892/or.2018.6881
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Abstract

Epidermal growth factor receptor tyrosine kinase inhibitors (EGFR‑TKIs) are efficacious drugs for non‑small cell lung cancers (NSCLCs) with EGFR‑activating mutations. Afatinib, a second‑generation EGFR‑TKI and osimertinib, a third‑generation EGFR‑TKI, are both standard therapies for patients with these types of cancer. Each drug possesses distinct binding sites for the tyrosine kinase domain of EGFR. The present study examined the efficacy of single and combination TKI therapy using in vitro growth inhibition assays of Ba/F3 cells with an EGFR‑activating Del19 mutation. Afatinib or osimertinib treatment alone markedly inhibited cell proliferation in Ba/F3 cells, although drug‑resistant cells eventually appeared with secondary EGFR mutations (either T790M or C797S, respectively) as determined by direct sequencing. Notably a combination of afatinib and osimertinib eradicated Ba/F3 cells with no development of resistance. We also evaluated the efficacy of afatinib, osimertinib, and a combination of the two, using drug‑resistant cells with T790M or C797S mutations. Osimertinib was effective for treating Ba/F3 cells with the T790M mutation, whereas afatinib was moderately effective against C797S Ba/F3 cells. However, subsequent treatment, even when both drugs were used in combination, could not completely eradicate the Ba/F3 population and doubly resistant cells with a variety of triple mutations were generated, including Del19/T790M/C797S. In conclusion, an initial treatment with a combination of osimertinib and afatinib is potentially more effective for eradicating mutant EGFR‑dependent cells than sequential drug use. This should be tested in future clinical trials to establish whether such a combination would be effective for the treatment of NSCLC.
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Copy and paste a formatted citation
Spandidos Publications style
Yonesaka K, Kobayashi Y, Hayashi H, Chiba Y, Mitsudomi T and Nakagawa K: Dual blockade of EGFR tyrosine kinase using osimertinib and afatinib eradicates EGFR‑mutant Ba/F3 cells. Oncol Rep 41: 1059-1066, 2019.
APA
Yonesaka, K., Kobayashi, Y., Hayashi, H., Chiba, Y., Mitsudomi, T., & Nakagawa, K. (2019). Dual blockade of EGFR tyrosine kinase using osimertinib and afatinib eradicates EGFR‑mutant Ba/F3 cells. Oncology Reports, 41, 1059-1066. https://doi.org/10.3892/or.2018.6881
MLA
Yonesaka, K., Kobayashi, Y., Hayashi, H., Chiba, Y., Mitsudomi, T., Nakagawa, K."Dual blockade of EGFR tyrosine kinase using osimertinib and afatinib eradicates EGFR‑mutant Ba/F3 cells". Oncology Reports 41.2 (2019): 1059-1066.
Chicago
Yonesaka, K., Kobayashi, Y., Hayashi, H., Chiba, Y., Mitsudomi, T., Nakagawa, K."Dual blockade of EGFR tyrosine kinase using osimertinib and afatinib eradicates EGFR‑mutant Ba/F3 cells". Oncology Reports 41, no. 2 (2019): 1059-1066. https://doi.org/10.3892/or.2018.6881
Copy and paste a formatted citation
x
Spandidos Publications style
Yonesaka K, Kobayashi Y, Hayashi H, Chiba Y, Mitsudomi T and Nakagawa K: Dual blockade of EGFR tyrosine kinase using osimertinib and afatinib eradicates EGFR‑mutant Ba/F3 cells. Oncol Rep 41: 1059-1066, 2019.
APA
Yonesaka, K., Kobayashi, Y., Hayashi, H., Chiba, Y., Mitsudomi, T., & Nakagawa, K. (2019). Dual blockade of EGFR tyrosine kinase using osimertinib and afatinib eradicates EGFR‑mutant Ba/F3 cells. Oncology Reports, 41, 1059-1066. https://doi.org/10.3892/or.2018.6881
MLA
Yonesaka, K., Kobayashi, Y., Hayashi, H., Chiba, Y., Mitsudomi, T., Nakagawa, K."Dual blockade of EGFR tyrosine kinase using osimertinib and afatinib eradicates EGFR‑mutant Ba/F3 cells". Oncology Reports 41.2 (2019): 1059-1066.
Chicago
Yonesaka, K., Kobayashi, Y., Hayashi, H., Chiba, Y., Mitsudomi, T., Nakagawa, K."Dual blockade of EGFR tyrosine kinase using osimertinib and afatinib eradicates EGFR‑mutant Ba/F3 cells". Oncology Reports 41, no. 2 (2019): 1059-1066. https://doi.org/10.3892/or.2018.6881
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