Author of

• 25970

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  P3.16 - Treatment of Early Stage/Localized Disease (Not CME Accredited Session) (ID 982)

  • Event: WCLC 2018
  • Type: Poster Viewing in the Exhibit Hall
  • Track:
  • Presentations: 1
  • Moderators:
  • Coordinates: 9/26/2018, 12:00 - 13:30, Exhibit Hall

  • 27750

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    P3.16-11 - Pattern of Recurrence of Completely Resected Lung Adenocarcinoma Varies According to EGFR Mutation Status (ID 12326)

    12:00 - 13:30  |  Presenting Author(s): Katsuya Watanabe
    • Abstract
    • Slides

    Background
    

    The prognostic significance of epidermal growth factor receptor (EGFR) mutations in resectable lung adenocarcinoma is not well defined. We evaluated the influence of EGFR mutation status on postoperative recurrence timing with the use of event dynamics.

    a9ded1e5ce5d75814730bb4caaf49419 Method
    

    A total of 644 patients with lung adenocarcinoma who underwent complete resection and examined for EGFR mutation status between 2008 and 2015 were studied. Disease-free survival (DFS) were calculated using the Kaplan-Meier method and compared between EGFR mutation-positive patients (n=322) and EGFR wild-type patients (n=322). Event dynamics, based on the hazard rate, were evaluated and only first events (distant metastases or local recurrence) were considered.

    4c3880bb027f159e801041b1021e88e8 Result
    

    There was no statistical significance in recurrence rate (9.9% versus 14.6%; p=0.09) between EGFR mutation-positive patients and EGFR wild-type patients. In patients with pathological stage I, DFS was significantly better in the EGFR mutant group than the wild-type group (p=0.009), whereas the EGFR mutant group had an inferior DFS compared with the wild-type group among patients with pathological stage II or higher (p=0.110). The resulting hazard rate curves indicated that the recurrence risk pattern was definitely correlated with EGFR mutation status, with an early highest peak during the first year for EGFR wild-type patients and a late maximum peak in the fifth year for EGFR mutation-positive patients.

    

    8eea62084ca7e541d918e823422bd82e Conclusion
    

    The prognostic value of EGFR mutations appears to be different according to pathological stage in completely resected adenocarcinoma. The hazard and the peak times of recurrence differ considerably between EGFR-mutant and wild-type patients.

    6f8b794f3246b0c1e1780bb4d4d5dc53

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