Abstract
Purpose
Epidermal growth factor receptor–tyrosine kinase inhibitor (EGFR–TKI) is effective as first-line chemotherapy for patients with advanced non-small-cell lung cancer (NSCLC) harboring sensitive EGFR mutations. However, whether the efficacy of second-line cytotoxic drug chemotherapy after first-line EGFR–TKI treatment is similar to that of first-line cytotoxic drug chemotherapy in elderly patients aged ≥ 75 years harboring sensitive EGFR mutations is unclear. Therefore, we aimed to investigate the efficacy and safety of cytotoxic drug chemotherapy after first-line EGFR–TKI treatment in elderly patients with NSCLC harboring sensitive EGFR mutations.
Methods
We retrospectively evaluated the clinical effects and safety profiles of second-line cytotoxic drug chemotherapy after first-line EGFR–TKI treatment in elderly patients with NSCLC harboring sensitive EGFR mutations (exon 19 deletion/exon 21 L858R mutation). Between April 2008 and December 2015, 78 elderly patients with advanced NSCLC harboring sensitive EGFR mutations received first-line EGFR–TKI at four Japanese institutions. Baseline characteristics, regimens, responses to first- and second-line treatments, whether or not patients received subsequent treatment, and if not, the reasons for non-administration were recorded.
Results
Overall, 20 patients with a median age of 79.5 years (range 75–85 years) were included in our analysis. The overall response, disease control, median progression-free survival, and overall survival rates were 15.0, 60.0%, 2.4, and 13.2 months, respectively. Common adverse events included leukopenia, neutropenia, anemia, thrombocytopenia, malaise, and anorexia. Major grade 3 or 4 toxicities included leukopenia (25.0%) and neutropenia (45.0%). No treatment-related deaths were noted.
Conclusion
Second-line cytotoxic drug chemotherapy after first-line EGFR–TKI treatment among elderly patients with NSCLC harboring sensitive EGFR mutations was effective and safe and showed equivalent outcomes to first-line cytotoxic drug chemotherapy.
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Acknowledgements
We thank Drs. Tomohiro Tamura, Sakae Fujimoto, Hiroshi Yokouchi, Yoichi Nakamura, and Takeshi Hisada for their assistance in preparing this manuscript. We also thank Editage (http://www.editage.jp) for English language editing.
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None of the authors have any financial or personal relationships with people or organizations that could inappropriately influence this work.
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The institutional review board of each institution approved the study protocol.
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The need for informed consent was waived by the Institutional Review Boards of each participating institution because of the retrospective nature of the study.
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Imai, H., Minemura, H., Sugiyama, T. et al. Efficacy and safety of cytotoxic drug chemotherapy after first-line EGFR–TKI treatment in elderly patients with non-small-cell lung cancer harboring sensitive EGFR mutations. Cancer Chemother Pharmacol 82, 119–127 (2018). https://doi.org/10.1007/s00280-018-3596-6
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DOI: https://doi.org/10.1007/s00280-018-3596-6