Abstract
Purpose
To explore whether targeted next generation sequencing (NGS) of liquid biopsy in advanced non-small cell lung cancer (NSCLC) could potentially overcome the innate problems that arise with standard tissue biopsy, like intratumoral heterogeneity and the inability to obtain adequate samples for analysis.
Methods
The Scopus, Cochrane Library, and MEDLINE (via PubMed) databases were searched for studies with matched tissue and liquid biopsies from advanced NSCLC patients, analyzed with targeted NGS. The number of mutations detected in tissue biopsy only, liquid biopsy only, or both was assessed and the positive percent agreement (PPA) of the two methods was calculated for every clinically relevant gene.
Results
A total of 644 unique relevant articles were retrieved and data were extracted from 38 studies fulfilling the inclusion criteria. The sample size was composed of 2000 mutations tested in matched tissue and liquid biopsies derived from 1141 patients. No studies analyzed circulating tumor cells. The calculated PPA rates were 53.6% (45/84) for ALK, 53.9% (14/26) for BRAF, 56.5% (13/23) for ERBB2, 67.8% (428/631) for EGFR, 64.2% (122/190) for KRAS, 58.6% (17/29) for MET, 54.6% (12/22) for RET, and 53.3% (8/15) for ROS1. We additionally recorded data for 65 genes that are not recommended by current guidelines for mutational testing. An extra category containing results of unspecified genes was added, with a PPA rate of 55.7% (122/219).
Conclusion
Despite many advantages, liquid biopsy might be unable to fully substitute its tissue counterpart in detecting clinically relevant mutations in advanced NSCLC patients. However, it may serve as a helpful tool when making therapeutic decisions. More studies are needed to evaluate its role in everyday clinical practice.
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Data availability
Raw data available upon request.
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SME: conceptualization, formal analysis, investigation, writing—original draft, and visualization. GIG: conceptualization, formal analysis, investigation, writing—original draft, and visualization. IPN: conceptualization, methodology, validation, writing—original draft, and supervision. VB: methodology, validation, formal analysis, data curation, writing—review and editing. PMS: methodology, writing—review and editing, and supervision. J-KW: methodology, writing—review and editing, and supervision. KPE: conceptualization, methodology, validation, resources, writing—review and editing, supervision, and project administration.
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Esagian, S.M., Grigoriadou, G.Ι., Nikas, I.P. et al. Comparison of liquid-based to tissue-based biopsy analysis by targeted next generation sequencing in advanced non-small cell lung cancer: a comprehensive systematic review. J Cancer Res Clin Oncol 146, 2051–2066 (2020). https://doi.org/10.1007/s00432-020-03267-x
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DOI: https://doi.org/10.1007/s00432-020-03267-x