Author of

• 20203

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  P1.01 - Advanced NSCLC (ID 757)

  • Event: WCLC 2017
  • Type: Poster Session with Presenters Present
  • Track: Advanced NSCLC
  • Presentations: 1
  • Moderators:
  • Coordinates: 10/16/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)

  • 22448

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    P1.01-042 - Dynamic ctDNA Assay by Next Generation Sequencing to Guide Targeted Therapy in Advanced Non-Small Cell Lung Cancer (ID 10387)

    09:30 - 09:30  |  Author(s): C. Hao
    • Abstract

    Background:
    It is difficult to identify tumor driving genes in advanced non-small cell lung cancer (NSCLC) patients especially for those who were unable to obtain cancer tissue samples and had developed treatment resistance. Circulating tumor DNA (ctDNA) has garnered much excitement over the past few years for its potential clinical utility as a tumor therapy monitoring tool. Our study aims to evaluate the usefulness of ctDNA for serial monitoring actionable genetic alterations in NSCLC patients.
    
    Method:
    34 pairs of matched cancer tissue and plasma samples were collected from patients with advanced NSCLC and applied to capture-based next generation sequencing (NGS) using the lung panel, consisting of critical exons and introns of 168 genes. Additional, serial monitoring of ctDNA was conducted in 11 NSCLC patients with actionable genetic alterations using the above NGS assay.
    
    Result:
    ctDNA yielded a close agreement of 85.3% (29/34) on actionable genetic alteration status when compared to cancer tissue at baseline in this study. Analysis of ctDNA at different time points showed a strong correlation to treatment efficacy. Interestingly, secondary genetic alterations such as EGFR mutation T790M were detected in 45.5% (5/11) of the patients during monitoring.
    
    Conclusion:
    ctDNA may be a potential alternative to conventional primary tissue based NGS assay. ctDNA assay by NGS could be clinically used to monitor the efficiency of personalized target therapy for NSCLC patients.