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

  • 27382

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    P3.01-28 - The Clinical Impact of Comprehensive cfDNA Genomic Testing in Lung Cancer (ID 13878)

    12:00 - 13:30  |  Author(s): Anna Belilovski Rozenblum
    • Abstract

    Background
    

    Next-generation sequencing (NGS) of cell-free circulating tumor DNA (cfDNA) enables a non-invasive option for comprehensive genomic analysis of non-small cell lung cancer (NSCLC) patients. Although plasma-detected genomic alterations have been shown to predict targeted therapy response, evidence of durability of response is lacking or limited to small cohorts as is the impact of cfDNA NGS results on clinical decision making.

    a9ded1e5ce5d75814730bb4caaf49419 Method
    

    In this retrospective study, data was collected on stage IIIB/IV NSCLC patients between the years 2014-2017 in Israel. We utilized cfDNA NGS (Guardant360) which covers the seven genes targetable with FDA-approved therapies in NSCLC.

    4c3880bb027f159e801041b1021e88e8 Result
    

    116 consecutively NSCLC patients were tested, 41.4% (48/116) before 1^st line therapy (Group A), 34.5% (40/116) upon progression on chemotherapy or immunotherapy (Group B1) and 24.1% (28/116) upon progression on EGFR TKIs (Group B2). Targetable genomic alterations were found in 65% of group A (15/48), 53% in group B1 (21/40) and 71% in group B2 (20/28). Treatment decision was changed to targeted therapy based on cfDNA NGS analysis in 23% (11/48), 25% (10/40) and 32% (9/28), respectively (total cohort 26%; 30/116). Response assessment (RECIST) showed complete response in 4% (1/28), partial response in 39% (11/28), stable disease in 32% (9/28) and progressive disease in 25% (7/28). Total objective response rate (ORR) was 43% and disease control rate was 75% for 5 months treatment duration.

    8eea62084ca7e541d918e823422bd82e Conclusion
    

    Comprehensive cfDNA testing impacted clinical decisions in 23% of naïve patients, 25% in patients who progressed on chemotherapy and 32% in EGFR TKI progressors. Median treatment duration was 5 months. This retrospective study extends previous reports by showing that responses based on cfDNA are durable and change treatment decisions at initial presentation and at progression.

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