Author of

• 25955

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  P3.01 - Advanced NSCLC (Not CME Accredited Session) (ID 967)

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

  • 27458

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    P3.01-99 - Effect of Pembrolizumab on Patients Harboring Uncommon Epidermal Growth Factor Receptor Mutations (ID 12703)

    12:00 - 13:30  |  Author(s): Akihiro Tamiya
    • Abstract

    Background
    

    The characteristics of non-small cell lung carcinoma (NSCLC) patients harboring uncommon epidermal growth factor receptor (EGFR) mutations differ from those of patients with common EGFR mutations. For example, male smokers were more common among patients with uncommon mutations. The efficacies of non-afatinib treatment strategies for patients harboring uncommon EGFR mutations are uncertain. The efficacy of immune checkpoint inhibitors (ICIs) in advanced NSCLC patients with EGFR mutations is limited. Furthermore, the efficacy of ICIs in patients harboring uncommon EGFR mutations is unknown.

    a9ded1e5ce5d75814730bb4caaf49419 Method
    

    We retrospectively reviewed five NSCLC cases with uncommon EGFR mutations and high program death (PD)-ligand (L)1 expression (> 50%) on tumor cells that were treated with the ICI pembrolizumab in our institute from April 2017 to April 2018. We collected data include sex, age, performance status, smoking history, PD-L1 expression, EGFR mutations status and clinical outcome.

    4c3880bb027f159e801041b1021e88e8 Result
    

    Four cases were male, median age was 68 (45-78), 4 cases were former/current smokers, 1 case was stage IIIC, 2 cases were stage IVA and 2 cases were stage IVB, 4 cases had G719X and 1 case had both exon 19 deletion and T790M. Four cases were treated with pembrolizumab as first line treatment and 1 case were treated as second line treatment after afatinib. Median number of pembrolizumab doses were 4 (1-7) and best responses were 2 partial response (PR), 2 stable disease (SD) and 1 progressive disease (PD). As adverse events, 1 case had grade 3 colitis and 1 case had grade 1 pneumonitis.

    8eea62084ca7e541d918e823422bd82e Conclusion
    

    Four patients with the G719X mutation were male former/current smokers and were effectively treated (PR of SD) with pembrolizumab. However, one patient with both common mutation and de novo T790M did not respond to pembrolizumab (PD). ICI-based treatment for patients harboring uncommon EGFR mutations may be one of the treatment option.

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