In:
Cancer Research, American Association for Cancer Research (AACR), Vol. 78, No. 13_Supplement ( 2018-07-01), p. 5589-5589
Abstract:
Background: Epidermal growth factor receptor (EGFR) mutations are well known predictive marker of targeted therapy. We compared the sensitivity of EGFR mutation detection techniques between matched achival lung cancer tissue and peripheral blood sample. Methods: We collected the paired samples from plasma and paraffin-embedded tumor tissue obtained before EGFR-tyrosine kinase inhibitor (EGFR-TKI). DNA extraction was performed using the QIAamp MinElute virus spin kit and EGFR mutation analysis was done by two detection methods. The current standard test is the PNAClampTM (Clamp) which is the PNA-based PCR clamping that selectively amplifies only the mutated target DNA sequence. The new technique is the PANAMutyperTM EGFR test (Mutyper), which use PNA clamping-assisted fluorescence melting curve analysis. Results: A total of 295 (188 male and 107 female) patients were analyzed in this study. The histologic types were composed of 258 adenocarcinoma, 22 squamous cell carcinoma and 15 others. Most were clinical stage IV (137, 46.4%) and the EGFR mutation rate of tissue sample by standard Clamp test was 25.7%. Plasma sensitivity was significantly higher in Mutyper than Clamp (71.2% vs. 30.0%, p & lt;0.001) with tissue as reference. The overall concordance and degree of agreement between two samples were better in Mutyper (91.9%, k=0.762, p & lt;0.001) than Clamp (81.7%, k=0.344, p & lt;0.001). In tissue sample, the median progression-free survival (PFS) of EGFR sensitive group was significantly longer than negative group regardless of the two methods. In plasma sample, the median PFS was significantly longer only by Mutyper (9.9 vs. 2.2 months, p=0.001), not by Clamp (9.8 vs. 7.6 months, p=0.968). Conclusions: Mutyper was useful liquid biopsy technique with better sensitivity than standard Clamp test. Citation Format: In-Jae Oh, Hyeong-Won Seo, Hyun-Ju Cho, Ha-Young Park, Bo-Gun Kho, Jin-Sun Chang, Tae-Ok Kim, Hong-Jun Shin, Cheol Kyu Park, Jung-Hwan Lim, Yong-Soo Kwon, Yu-Il Kim, Sung-Chul Lim, Young-Chul Kim, Yoo-Duk Choi. Detection of epidermal growth factor receptor mutations from circulating tumor DNA versus archival tissue of lung cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr 5589.
Type of Medium:
Online Resource
ISSN:
0008-5472
,
1538-7445
DOI:
10.1158/1538-7445.AM2018-5589
Language:
English
Publisher:
American Association for Cancer Research (AACR)
Publication Date:
2018
detail.hit.zdb_id:
2036785-5
detail.hit.zdb_id:
1432-1
detail.hit.zdb_id:
410466-3
Permalink