Abstract |
Low-coverage whole-genome sequencing (LC-WGS) can provide insight into oncogenic molecular changes. Serum extracellular vesicles (EV) represent a novel liquid biopsy source of tumoral DNA. This study compared copy number alteration (CNA) profiles generated from LC-WGS of formalin-fixed paraffin-embedded (FFPE) tumoral DNA and EV- DNA obtained from cancer patients. Patients with squamous cell carcinoma of the base of tongue (n = 3) and cutaneous squamous cell carcinoma (n = 2) were included. LC-WGS (0.5-1X coverage) was performed on FFPE- DNA and serum EV- DNA. Similarity between CNA profiles was analysed using QDNAseq. FFPE samples had a mean CNA of 31 (range 17-50) over 1.9 × 109 (range 1.0-2.6 × 109) bp in length, and EV samples had a mean CNA value of 17 (range 7-19) over 7.6 × 108 (range 2.9-15 × 108) bp in length. A mean of 8 (range 0-21) CNA over 5.9 × 108 (range 1.6-14 × 108) bp in length was found to overlap between EV and FFPE-derived samples per patient. Although the mean correlation efficient between samples was r = 0.34 (range - .08 to 0.99), this was not statistically significant (p > 0.05). Regions of highest deletion and duplication in FFPE samples were not well reflected in the EV- DNA. Selected CNA regions in EV-associated DNA were reflective of the primary tumor, however appreciation of global CNA and areas of most significant change was lost. The utility of LC-WGS of EV-derived DNA is likely limited to molecular alterations of known interest.
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Authors | Bella Nguyen, Nicholas C Wong, Tim Semple, Michael Clark, Stephen Q Wong, Connull Leslie, Bob Mirzai, Michael Millward, Katie Meehan, Annette M Lim |
Journal | Scientific reports
(Sci Rep)
Vol. 11
Issue 1
Pg. 4016
(02 17 2021)
ISSN: 2045-2322 [Electronic] England |
PMID | 33597619
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Biomarkers, Tumor
- Formaldehyde
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Topics |
- Aged
- Biomarkers, Tumor
(blood, genetics)
- Carcinoma, Squamous Cell
(genetics, metabolism)
- DNA Copy Number Variations
(genetics)
- Extracellular Vesicles
(genetics, pathology)
- Female
- Formaldehyde
(chemistry)
- Genome, Human
(genetics)
- Genomics
(methods)
- High-Throughput Nucleotide Sequencing
(methods)
- Humans
- Male
- Middle Aged
- Mouth Neoplasms
(genetics, metabolism)
- Neoplasm Metastasis
(genetics, pathology)
- Neoplasms
(genetics)
- Paraffin Embedding
(methods)
- Tissue Fixation
(methods)
- Whole Genome Sequencing
(methods)
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