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J. Lim



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    P3.02b - Poster Session with Presenters Present (ID 494)

    • Event: WCLC 2016
    • Type: Poster Presenters Present
    • Track: Advanced NSCLC
    • Presentations: 1
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      P3.02b-018 - Detection of Epidermal Growth Factor Receptor Mutations in Circulating Cell-Free DNA versus Tumor Biopsy (ID 5550)

      14:30 - 14:30  |  Author(s): J. Lim

      • Abstract
      • Slides

      Background:
      Epidermal growth factor receptor (EGFR) mutations are predictive marker of EGFR-tyrosine kinase inhibitor (TKI) therapy. We compared the sensitivity of EGFR mutation detection techniques between matched tumor tissue and peripheral blood sample in patients with lung adenocarcinoma.

      Methods:
      We collected the paired samples from plasma and paraffin-embedded tumor tissue in 202 patients before EGFR-TKIs. DNA extraction was performed using the QIAamp MinElute virus spin kit and EGFR mutation analysis was done by two detection methods. One is the PNAClamp[TM] which is the PNA-based PCR clamping that selectively amplifies only the mutated target DNA sequence as minor portion in mixture with the major wild type DNA sequences. The other is the PANAMutyper[TM] EGFR kit, which use PNA clamping-assisted fluorescence melting curve analysis to perform mutation detection and genotyping. The degree of agreement was evaluated by Cohen's kappa value.

      Results:
      The EGFR mutation rates by PANAMutyper[TM]R and PNAClamp[TM] were 51.0% vs. 47.0% in tissue, and 22.2% vs. 11.4% in plasma sample, respectively. Overall concordance rates and the degree of agreement between tissue and plasma samples was better in PANAMutyper[TM]R (69.3%, k=0.393, p<0.001) than PNAClamp[TM] (62.3%, k=0.211, p<0.001). Sensitivity of plasma EGFR mutations was higher (41.7% vs. 22.1%, p<0.001) and false negative rate was lower in PANAMutyper[TM]R test (58.3% vs. 77.9%, p<0.001). Response to EGFR-TKI was correlated with plasma EGFR mutation by PANAMutyper[TM]R (p=0.025) unlike PNAClamp[TM ](p=0.829).

      Conclusion:
      The sensitivity and concordance rate of PANAMutyper[TM]R test were better than standard PNAClamp[TM] test. So this technique can be useful to detect EGFR mutation in circulating cell-free DNA sample.

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