Journal article
Exhaled Breath Condensate (EBC) analysis of circulating tumour DNA (ctDNA) using a lung cancer specific UltraSEEK oncogene panel
Lung cancer (Amsterdam, Netherlands), Vol.168, pp.67-73
06/2022
DOI: 10.1016/j.lungcan.2022.04.013
PMID: 35526313
Abstract
•Exhaled Breath (EBC) and plasma were analysed for 5 genetic alterations using ultrasensitive PCR in lung cancer patients.•Results were compared to corresponding diagnostic tissue samples analysed using targeted NextGeneration Sequencing (NGS).•Higher failure rates owing to unamplifiable DNA were noted in tissue NGS compared to EBC and Plasma.•Significantly higher numbers of mutations in EGFR, KRAS and PIK3CA were identified in EBC and plasma than tissue NGS.•Overlap and divergence was noted in the mutation profiles between EBC and plasma.
Small diagnostic tissue samples can be inadequate in testing an expanding list of validated oncogenic driver alterations and fail to reflect intratumour heterogeneity (ITGH) in lung cancer. Liquid biopsies are non-invasive and may better reflect ITGH. Most liquid biopsies are performed in the context of circulating tumour DNA (ctDNA) in plasma but Exhaled Breath Condensate (EBC) shows promise as a lung-specific liquid biopsy.
In this prospective, proof-of-concept study we carried out targeted Next Generation Sequencing (NGS) on diagnostic tissue samples from 125 patients with lung cancer and compared results to plasma and EBC for 5 oncogenic driver mutations (EGFR, KRAS, PIK3CA, ERBB2, BRAF) using an ultrasensitive PCR technique (UltraSEEK™ Lung Panel on the MassARRAY® System, Agena Bioscience, San Diego, CA, USA).
There was a significantly higher failure rate due to unamplifiable DNA in tissue NGS (57/125, 45.6%) compared to plasma (27/125, 21.6%, p < 0.001 and EBC (26/125,20.8%, p ≤ 0.001. Consequently, both plasma and EBC identified higher number of mutations compared to tissue NGS. Specifically, there were significantly higher numbers of mutations detected in EGFR, KRAS and PIK3CA in plasma (p = 9.82 × 10−3, p = 3.14 × 10−5, p = 1.95 × 10−3) and EBC (p = 2.18 × 10−3, p = 2.28 × 10−4,p = 0.016) compared to tissue NGS. There was considerable divergence in mutation profiles between plasma and EBC with 34/76 (44%) mutations detected in plasma and 37/74 (41.89%) in EBC unique to their respective liquid biopsy.
The results suggest that EBC is effective in identifying clinically relevant alterations in patients with lung cancer using UltraSEEK™ and has a potential role as an adjunct to plasma testing.
Details
- Title: Subtitle
- Exhaled Breath Condensate (EBC) analysis of circulating tumour DNA (ctDNA) using a lung cancer specific UltraSEEK oncogene panel
- Creators
- Daniel J. Ryan - Royal College of Surgeons in IrelandSinead Toomey - Royal College of Surgeons in IrelandRobert Smyth - Royal College of Surgeons in IrelandStephen F. Madden - Royal College of Surgeons in IrelandJulie Workman - Royal College of Surgeons in IrelandRobert Cummins - Royal College of Surgeons in IrelandKatherine Sheehan - Royal College of Surgeons in IrelandJoanna Fay - Royal College of Surgeons in IrelandJarushka Naidoo - Beaumont HospitalOscar S. Breathnach - Beaumont HospitalPatrick G. Morris - Beaumont HospitalLiam Grogan - Beaumont HospitalMichael E. O'Brien - Department of Respiratory Medicine, Beaumont Hospital, Dublin, IrelandImran Sulaiman - Beaumont HospitalBryan T. Hennessy - Royal College of Surgeons in IrelandRoss K. Morgan - Beaumont Hospital
- Resource Type
- Journal article
- Publication Details
- Lung cancer (Amsterdam, Netherlands), Vol.168, pp.67-73
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.lungcan.2022.04.013
- PMID
- 35526313
- ISSN
- 0169-5002
- eISSN
- 1872-8332
- Language
- English
- Date published
- 06/2022
- Academic Unit
- Pulmonary, Critical Care, and Occupational Medicine; Internal Medicine
- Record Identifier
- 9984695827802771
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