Author of

• 10720

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  P1.09 - Poster Session 1 - Combined Modality (ID 212)

  • Event: WCLC 2013
  • Type: Poster Session
  • Track: Combined Modality
  • Presentations: 1
  • Moderators:
  • Coordinates: 10/28/2013, 09:30 - 16:30, Exhibit Hall, Ground Level

  • 10730

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    P1.09-010 - Impact of the presence of EGFR mutation on the definitive chemoradiotherapy in patients with locally advanced non-small cell lung cancer: pattern of relapses and survival analyses in 198 patients (ID 1227)

    09:30 - 09:30  |  Author(s): T. Katsui Taniyama
    • Abstract

    Background
    The epidermal growth factor receptor (EGFR) mutational status is an important biomarker in patients with advanced non-small cell lung cancer (NSCLC). However, little is known about the frequency and clinical significance of EGFR mutation in patients with potentially curable locally advanced NSCLC (LA-NSCLC) who are eligible for definitive chemoradiotherapy (CRT).

    Methods
    Between Jan 2001 and Dec 2010, we conducted analysis for the presence of EGFR mutations, in consecutive non-squamous NSCLC (mainly in adenocarcinoma) patients who were eligible for CRT. The response rate (RR), progression-free survival (PFS), 2-year progression-free rate, first recurrent sites, and overall survival were investigated according to the EGFR mutational status.

    Results
    A total of 528 patients received CRT at the National Cancer Center Hospital during the study period, of which 274 were diagnosed as having non-squamous NSCLC (mainly adenocarcinoma). Sufficient specimens for mutational analyses could be obtained from 198 patients, and EGFR mutations were found at a frequency of 17% in these patients. In addition to the well-known characteristics of NSCLC patients carrying EGFR mutations (female, adenocarcinoma, and never/light smoker), the proportion of cases with smaller (T1/2) primary lesions was also higher in the patients carrying mutated EGFR than in those carrying wild-type EGFR. Patients carrying mutated EGFR showed similar RR (79% vs. 76%), median PFS (11.8 m vs. 10.6 m) and 2-year progression-free survival rate (22% vs. 30%) as compared to those carrying wild-type EGFR. Local recurrence as first relapse occurred less frequently in patients carrying mutated EGFR than in those carrying wild-type EGFR (4% vs. 21%). A majority of the patients with mutated EGFR showing disease progression received EGFR-TKIs (55%), and these patients showed a longer post-progression survival and a higher 5 year survival rate (50% vs. 34%) than the patients with wild-type EGFR.

    Conclusion
    Among the LA-NSCLC patients eligible for definitive CRT who were included in this analysis, 17% harbored EGFR-activating mutations in the carcinoma specimens. Although definitive CRT was similarly effective in both patients with mutated EGFR and wild-type EGFR, substantially lower frequency of local relapse was noted in the patients carrying mutated EGFR. Among the LA-NSCLC patients harboring EGFR mutations who developed disease progression, those treated with EGFR-TKIs showed a longer post-progression survival and overall survival as compared to those who did not receive EGFR-TKIs.