The Korean journal of internal medicine

The Korean Association of Internal Medicine (대한내과학회)
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Epidermal growth factor receptor mutation and pattern of brain metastasis in patients with non-small cell lung cancer

  • Baek, Min Young (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Ahn, Hee Kyung (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Park, Kyu Ree (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Park, Hwa-Sun (Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Kang, Shin Myung (Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Park, Inkeun (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Kim, Young Saing (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Hong, Junshik (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Sym, Sun Jin (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Park, Jinny (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Lee, Jae Hoon (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Shin, Dong Bok (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center) ;
  • Cho, Eun Kyung (Division of Hematology and Oncology, Department of Internal Medicine, Gachon University Gil Medical Center)
  • Received : 2015.06.06
  • Accepted : 2015.10.19
  • Published : 2018.01.01
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Abstract

Background/Aims: We investigated the time taken for patients with metastatic non-small cell lung cancer (NSCLC) to develop brain metastases (BM), as well as their subsequent overall median survival following diagnosis, considering the epidermal growth factor receptor (EGFR) mutational status. Methods: We retrospectively investigated the medical records of 259 patients diagnosed with advanced NSCLC from January 2010 to August 2013, who were tested for EGFR mutations. The time from the diagnosis of advanced NSCLC to the development of BM and the overall median survival after BM development (BM-OS) were evaluated and compared by EGFR mutational status. Results: Sixty-seven patients (25.9%) developed BM. Synchronous BM occurred more often in patients with EGFR mutation type (MT) (n = 20, 27.4%) compared with EGFR wild type (WT) (n = 27, 14.5%, p < 0.009). The median BM-OS was significantly longer in patients with EGFR MT than in those with EGFR WT (25.7 months vs. 3.8 months, p < 0.001), and a similar trend was noticed for patients with synchronous BM (25.7 months for EGFR MT vs. 6.8 months for EGFR WT, p < 0.001). However, in patients with metachronous BM development, the difference in BM-OS between patients with EGFR MT (14.6 months) and EGFR WT (2.5 months) did not reach statistical significance (p = 0.230). Conclusions: Synchronous BM was more common in NSCLC patients with EGFR MT than in those with EGFR WT. However, EGFR mutations were associated with significantly longer median BM-OS, especially when the brain was the first metastatic site.

Keywords

References

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