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T. Twito
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P2.03b - Poster Session with Presenters Present (ID 465)
- Event: WCLC 2016
- Type: Poster Presenters Present
- Track: Advanced NSCLC
- Presentations: 1
- Moderators:
- Coordinates: 12/06/2016, 14:30 - 15:45, Hall B (Poster Area)
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P2.03b-047 - The Clinical Impact of Multiplex ctDNA Gene Analysis in Lung Cancer (ID 5758)
14:30 - 14:30 | Author(s): T. Twito
- Abstract
Background:
Next-generation sequencing (NGS) of cell-free circulating tumor DNA (ctDNA) enables a non-invasive option for comprehensive genomic analysis of lung cancer patients. Currently there is insufficient data in regard to the impact of ctDNA analysis on clinical decision making. In this study, we evaluated the clinical utility of ctDNA sequencing on treatment strategy and progression-free survival.
Methods:
In this retrospective study, data was collected from files of 90 NSCLC patients monitored between the years 2011-2016 at the Thoracic Center Unit at Davidoff Cancer Center, Rabin Medical Center, Israel. The patients performed liquid biopsy NGS analysis by a commercial test (Guardant 360), in which ctDNA was extracted from plasma and analyzed by massively parallel paired end synthesis by digital NGS. This test allows the detection of somatic alterations such as point mutations, indels, fusions and copy number amplifications.
Results:
Age at diagnosis ranged between 31 and 89 years, with median age of 63 years. Sex ratio was 1:2.2. Out of 90 patients, 38 consecutive patient files have already been reviewed for clinical impact. 82% (31/38) were diagnosed with Adenocarcinoma. 5% (2/38) performed ctDNA at initial diagnosis, 48% (17/38) performed ctDNA after 1[st] line therapy due to progressive disease and the remaining 50% performed the test after multiple lines of treatment. Liquid biopsy NGS analysis allowed the detection of actionable mutations, according to NCCN guidelines, in 68% (26/38). Treatment decision was changed subsequent to NGS analysis in 34% (13/38) which received tailored targeted therapy. Interestingly, 13% (5/38) were detected with EGFR activating mutation following wild type result by standard local molecular testing based on RT-PCR from tissue biopsy. Based on the RECIST criteria of response evaluation, 30% of the patients had partial response after switching to targeted therapy, 15% had stable disease, 15% experienced progressive disease and ~40% were not evaluated yet. Survival rates will be calculated further in the study based on data availability.
Conclusion:
Our interim results analysis showed that liquid biopsy ctDNA testing revealed possible treatment options for more than two-thirds of patients analyzed, including FDA-approved drugs as well as eligibility for clinical trials. Most of the patients that were evaluated showed a positive response to treatment. Although this topic needs to be further assessed in large randomized controlled trials, these positive results emphasize the utility of liquid biopsy analysis to guide clinicians to select the right therapy for the right patient.
