Liquid biopsy in lung cancer is evolving as an important added tool for screening, early detection, monitoring, and even prognostication of lung cancer. Guidelines and expert recommendations for its use in practice are available and there are specific scenarios in which liquid biopsy is actively being adopted. Several biomarkers, from which important tumor genomic information is obtained, are currently the subject of ongoing investigation. In this review, we summarize the available data on each specific biomarker and provide an overview on how they play a role in current clinical practice.
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