Detection of EGFR Mutations in Circulating Tumor DNA (ctDNA) Retrieved from Plasma – Interlaboratory Quality Assessment in the Czech Republic
Authors:
Čapková Linda 1; Kalinová Markéta 1; Tichá Ivana 2; Parobková Eva 3; Matějčková Milada 3; Vošmiková Hana 4; Horký Ondřej 5; Bartáková Karolína 5; Drábek Jiří 6; Bajerová Monika 7; Dundr Pavel 2
Authors‘ workplace:
Ústav patologie a molekulární medicíny, 2. LF UK a FN Motol, Praha
1; Ústav patologie, 1. LF UK a VFN v Praze
2; Oddělení patologie a molekulární medicíny, Thomayerova nemocnice, Praha
3; Fingerlandův ústav patologie, LF UK a FN Hradec Králové
4; Oddělení onkologické patologie, Masarykův onkologický ústav, Brno
5; Ústav molekulární a translační medicíny, LF UP v Olomouci
6; Centrum molekulární biologie a genové terapie, Interní hematologická a onkologická klinika LF MU a FN Brno
7
Published in:
Klin Onkol 2018; 31(5): 353-360
Category:
Original Articles
doi:
https://doi.org/10.14735/amko2018353
Overview
Background:
Detection of EGFR mutations in tumor tissue represents a standard testing procedure in patients with non-small cell lung cancer. Molecular testing of circulating tumor DNA (ctDNA) in plasma enables detection of mutations in cases where tumor specimens are unavailable or when monitoring of therapeutic responses is necessary. In addition, according to the recent literature, ctDNA better reflects the heterogeneity of the neoplastic cell population than isolated tumor lesion or metastasis. We report a national interlaboratory evaluation aimed at assessing the analytical quality of ctDNA EGFR testing in plasma across seven reference laboratories in the Czech Republic.
Material and methods:
Aliquots of 13 plasma samples were sent to 7 laboratories and consisted of commercially available 2 ml plasma specimens of genomic DNA with mutant allelic frequencies of 5, 0.5, 0.05, and 0% of the most common sensitizing mutations (deletion in exon 19, L858R) and the resistance mutation T790M. DNA extraction and EGFR testing were performed according to standard procedures. In 6/7 laboratories the cobas® EGFR Mutation Test v2 was used. One laboratory employed the Super-ARMS® EGFR Mutation Detection Kit.
Results:
In total, 91 genotypes were determined with an overall error rate of 24.2% (22/91). The overall error rates were 3.2% (2/63) for the 0.5% mutation frequency and 0% for the 5% mutation frequency (0/35), respectively. No false positive results were reported. The cobas® method achieved consistent results with the 0.05% mutation frequency for the exon 19 deletion. For L858R and T790M mutations, the threshold was above the 0.5% frequency.
Conclusions:
The results show that EGFR testing for ctDNA in plasma has limited sensitivity, especially for detection of the T790M mutation. Particularly, in ctDNA testing of very low mutated DNA plasma fractions (below 0.01%), emphasis should be placed on the use of highly sensitive molecular methods. The outcomes of this quality assessment confirm the need for rebiopsy in patients with negative plasma results because of a higher false negative rate in comparison to tissue testing.
Key words:
circulating DNA – liquid biopsy – epidermal growth factor receptor – non-small cell lung cancer – quality control
This work was supported by grants of AstraZeneca and the project of the Ministry of Health number 00064203 (Motol University Hospital).
The authors declare they have no potential confl icts of interest concerning drugs, products, or services used in the study.
The Editorial Board declares that the manuscript met the ICMJE recommendation for biomedical papers.
Submitted: 4. 6. 2018
Accepted: 1. 8. 2018
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