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Veldore VH, Choughule A, Routhu T, Mandloi N, Noronha V, Joshi A, Dutt A, Gupta R, Vedam R, Prabhash K. Validation of liquid biopsy: plasma cell-free DNA testing in clinical management of advanced non-small cell lung cancer. Lung Cancer (Auckl) 2018; 9:1-11. [PMID: 29379323 PMCID: PMC5757203 DOI: 10.2147/lctt.s147841] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Plasma cell-free tumor DNA, or circulating tumor DNA (ctDNA), from liquid biopsy is a potential source of tumor genetic material, in the absence of tissue biopsy, for EGFR testing. Our validation study reiterates the clinical utility of ctDNA next generation sequencing (NGS) for EGFR mutation testing in non-small cell lung cancer (NSCLC). A total of 163 NSCLC cases were included in the validation, of which 132 patients had paired tissue biopsy and ctDNA. We chose to validate ctDNA using deep sequencing with custom designed bioinformatics methods that could detect somatic mutations at allele frequencies as low as 0.01%. Benchmarking allele specific real time PCR as one of the standard methods for tissue-based EGFR mutation testing, the ctDNA NGS test was validated on all the plasma derived cell-free DNA samples. We observed a high concordance (96.96%) between tissue biopsy and ctDNA for oncogenic driver mutations in Exon 19 and Exon 21 of the EGFR gene. The sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy of the assay were 91.1%, 100% 100%, 95.6%, and 97%, respectively. A false negative rate of 3% was observed. A subset of mutations was also verified on droplet digital PCR. Sixteen percent EGFR mutation positivity was observed in patients where only liquid biopsy was available, thus creating options for targeted therapy. This is the first and largest study from India, demonstrating successful validation of circulating cell-free DNA as a clinically useful material for molecular testing in NSCLC.
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Affiliation(s)
| | | | | | | | | | - Amit Joshi
- Tata Memorial Centre, Parel, Mumbai, India
| | - Amit Dutt
- The Advanced Centre for Treatment, Research and Education in Cancer, Tata Memorial Center, Kharghar, Navi Mumbai, Maharashtra, India
| | - Ravi Gupta
- MedGenome Labs Private Ltd,, Bangalore, India
| | - Ramprasad Vedam
- MedGenome Labs Private Ltd,, Bangalore, India
- Ramprasad Vedam, MedGenome Labs Private Ltd., 3 Floor, Narayana Netralaya Building, NH City, 258/A, Bommasandra Industrial Area, Bommasandra, Bangalore 560099, India, Email
| | - Kumar Prabhash
- Tata Memorial Centre, Parel, Mumbai, India
- Correspondence: Kumar Prabhash, Department of Medical Oncology, Tata Memorial Hospital, Dr E Borges Road, Parel, Mumbai 400 012, India, Email
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Vidya VH, Routhu T, Prabhudesai SA, Krishnamoorthy N, Hazarika D, Rahaman SM, BN T, Shrivastava P, Naik R, SP S, Thungappa SC, Patil S, Raghavendra RM, Ajaikumar BS. Molecular profiling in NSCLC: A pilot study to screen for new therapeutic targets. J Clin Oncol 2014. [DOI: 10.1200/jco.2014.32.15_suppl.e22158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | - Tejaswi Routhu
- Triesta Reference Laboratory, Health Care Global Cancer Hospitals, bangalore, India
| | | | | | - Diganta Hazarika
- Triesta Reference Laboratory, Health Care Global Enterprises, Ltd, Bangalore, India
| | - Syed m Rahaman
- Triesta Reference Laboratory, Health Care Global Enterprises, Ltd, Bangalore, India
| | - Tejaswini BN
- Triesta Reference Laboratory, Health Care Global Enterprises, Ltd, Bangalore, India
| | - Payal Shrivastava
- Triesta Reference Laboratory, Health Care Global Enterprises, Ltd, Bangalore, India
| | | | | | | | - Shekar Patil
- Health Care Global Enterprises Ltd., Bangalore, India
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