Abstract
Due to the different mechanisms of cell-free DNA production, the single-stranded DNA to double-stranded DNA ratio in blood maybe different between healthy individuals and gastric cancer (GC) patients. We aimed to explore the potential application of this ratio in GC diagnosis. The plasma cell-free DNA extracts from 118 healthy individuals and 106 GC patients were prepared. The levels of single-stranded DNA or double-stranded DNA in plasma, and the single-stranded DNA to double-stranded DNA ratio on the diagnostic efficiency for GC were assessed with ROC curve. The relationships between this ratio and the clinical characteristics of GC patients were analyzed. The ratios in 63 GC patients before and after surgery were compared. In healthy individuals, the single-stranded DNA to double-stranded DNA ratio was not affected by factors including age, gender and BMI, and subjected to normal distribution (P = 0.1090). GC patients had a lower value of this ratio than healthy individuals (P < 0.0001). Considering this ratio as a GC diagnostic indicator, the area under ROC curve (AUC) was 0.923[95% confidence interval (CI):0.880–0.955]. This ratio in unresectable GC was obviously lower than that in resectable GC (P = 0.0045). There was a rank correlation between this ratio and GC TNM staging (rho = −0.266, P = 0.0058), but it had no correlation with tumor size (r = 0.14, P = 0.145). Additionally, this ratio was not affected by hemolysis and repeated freeze-thaw of blood samples, and was significantly elevated after surgery(P < 0.0001). The single-stranded DNA to double-stranded DNA ratio in plasma is a stable non-invasive indicator for GC diagnosis.
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Data Availability
The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
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(I) Conception and design: Xuewen Huang.
(II) Administrative support: Xuewen Huang.
(III) Provision of study materials or patients: Qi Zhao, Yiqiu Xu.
(IV) Collection and assembly of data: Xianyuan An, Lanjing Zhao, Dandan Yuan.
(V) Data analysis and interpretation: Xuewen Huang, Jie Pan, Lanfeng Shen, Dandan Yuan.
(VI) Manuscript writing: All authors.
(VII) Final approval of manuscript: All authors.
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Supplementary Fig. 1
Comparison of cfDNA extraction efficiency between two methods. (a-b) A total of 20 randomly selected plasma samples were all subjected to cfDNA extractions with the magnetic bead method and the Qiagen column method, respectively. The concentrations of ssDNA (a) and dsDNA (b) after normalization to total sample volumes were compared. (PNG 213 kb)
Supplementary Fig. 2
Confirmation of the nature of nucleic acids in cfDNA extracts. (a-d) The cfDNA extracts isolated from the plasma samples of randomly selected 20 GC patients were subjected to RNase A (a-b) and DNase I (c-d) digestion. The concentrations of ssDNA (a and c) and dsDNA (b and d) in the cfDNA extracts before and after RNase A (a-b) or DNase I (c-d) digestions were measured. (e-f) The DNA contents in cfDNA extracts before (e) and after (f) DNase I digestion were examined by the Agilent 2100 bioanalyzer. Representative images of electropherogramwere selected from the data of three GC patients-derived cfDNA extract samples with similar results. (g) Agarose gel images show the electrophoresis results of three GC patients-derived cfDNA extract samples before and after DNase I digestion. (PNG 1297 kb)
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Huang, X., Zhao, Q., An, X. et al. The Ratio of ssDNA to dsDNA in Circulating Cell-Free DNA Extract is a Stable Indicator for Diagnosis of Gastric Cancer. Pathol. Oncol. Res. 26, 2621–2632 (2020). https://doi.org/10.1007/s12253-020-00869-1
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DOI: https://doi.org/10.1007/s12253-020-00869-1