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L.T. Wang



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    OA 07 - Biomarker for Lung Cancer (ID 659)

    • Event: WCLC 2017
    • Type: Oral
    • Track: Biology/Pathology
    • Presentations: 1
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      OA 07.01 - A Prospective Study of Perioperative Rapid Clearance of Circulating Tumor DNA in R0 Resected Non-Small Cell Lung Cancer Patients (ID 8044)

      15:45 - 17:30  |  Author(s): L.T. Wang

      • Abstract
      • Presentation
      • Slides

      Background:
      Our previous study has shown the feasibility and clinical application of circulating tumor DNA(ctDNA) detection in stage I-IIIA surgical non-small cell lung cancer (NSCLC) patients(NCT02645318). The aim of this prospective study is to investigate the perioerative changes of ct DNA in surgical NSCLC patients.

      Method:
      From 11/2016, suspected lung cancer patients who proposed radical tumor resection were enrolled prospectively. Six precise time points plasma samples were obtained before surgery(time A) and after tumor resection (time B to F, 5min-3days) before discharge. A series driver mutations were quantitatively evaluated by multiplex assay based on circulating single-molecule amplification and resequencing technology (cSMART). Positive plasma mutations were validated in tumor tissue by targeted sequencing. Normal tissue and white blood cell DNA were used as controls. Study protocol (NCT02965391) was approved by Medical Ethics Committee (2016PHB156-01).

      Result:
      The consort diagram was shown in Fig 1. Thirteen R0 resected patients met the inclusion criteria. Fifteen genetic alterations were identified including four EGFR, seven TP53, two PIK3CA, one KRAS mutation and one ALK rearrangement. Ten (76.9%) cases had a gradually decrease of mutation ratio as time went on, and the average mutation ratio was 3.32%, 2.68%, 1.38%, 0.07%, 0.04% and 0 at the time-points A to F, respectively. Eight patients’ and three patients’ mutation ratio in time point D and time point E were not decease to zero, respectively. Advanced stage patients were more likely to have a positive ctDNA in time D and E, although there was no significant difference. All the mutations’ ratio dropped to zero in time F. No patients’ had positive ctDNA one month after surgery.Figure 1



      Conclusion:
      This is the first prospective study to evaluate the dynamic changes of ctDNA in surgical lung cancer patients. ctDNA has a rapid clearance in R0 resected lung cancer patients, but is not completely regression until 72h after surgery.

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