1. Detection of EGFR mutations in liquid biopsy samples using allele-specific quantitative PCR: A comparative real-world evaluation of two popular diagnostic systems.
- Author
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Szpechcinski A, Bryl M, Wojcik P, Czyzewicz G, Wojda E, Rudzinski P, Duk K, Moes-Sosnowska J, Maszkowska-Kopij K, Langfort R, Barinow-Wojewodzki A, and Chorostowska-Wynimko J
- Subjects
- Alleles, ErbB Receptors genetics, Humans, Liquid Biopsy, Mutation, Protein Kinase Inhibitors therapeutic use, Real-Time Polymerase Chain Reaction, Carcinoma, Non-Small-Cell Lung diagnosis, Carcinoma, Non-Small-Cell Lung genetics, Lung Neoplasms diagnosis, Lung Neoplasms genetics
- Abstract
Purpose: The detection of epidermal growth factor receptor (EGFR) mutations in plasma cell-free DNA (cfDNA) is an auxiliary tool for the molecular diagnosis of non-small cell lung cancer (NSCLC), especially when an adequate tumor tissue specimen cannot be obtained. We compared the diagnostic accuracy of two commonly used in vitro diagnostic-certified allele-specific quantitative PCR assays for detecting plasma cfDNA EGFR mutations., Methods: We analyzed EGFR mutations in plasma cfDNA from 90 NSCLC patients (stages I-IV) before treatment (n = 60) and after clinical progression on EGFR tyrosine kinase inhibitors (n = 30) using the cobas EGFR mutation test v2 (Roche Molecular Systems, Inc.) and therascreen EGFR Plasma RGQ PCR kit (Qiagen GmbH)., Results: There was higher concordance between plasma cfDNA and matched tumor tissue EGFR mutations with cobas (66.67%) compared with therascreen (55.93%). The concordance rate increased to 90.00% with cobas (Cohen's kappa coefficient, κ = 0.80; p < 0.0001) and 73.33% with therascreen (κ = 0.49; p = 0.0009) in advanced NSCLC patients. In treatment-naïve patients, cobas was superior to therascreen (sensitivity: 82.35% vs. 52.94%; specificity: 100% vs. 100%). In patients with clinical progression on EGFR tyrosine kinase inhibitors, EGFR exon 20 p.T790M was detected in 30% and 23% of cfDNA samples by cobas and therascreen, respectively., Conclusions: Cobas was superior to therascreen for detection of plasma EGFR mutations in advanced NSCLC. Plasma cfDNA EGFR mutation analysis is complex; therefore, the diagnostic accuracy of commercially available assays should be validated., Competing Interests: Declaration of competing interest The authors declare no conflict of interests., (Copyright © 2021 The Authors. Published by Elsevier B.V. All rights reserved.)
- Published
- 2021
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