Abstract
Purpose
The aim of our study was to investigate the correlation between cfDNA concentration and fragment size fraction with FDG PET/CT- and CT-derived parameters in untreated NSCLC patient.
Methods
Fifty-three patients diagnosed of locally advanced or metastatic NSCLC who had undergone FDG PET/CT, CT and cfDNA analysis prior to any treatment were included in this retrospective study. CfDNA concentration was measured by fluorometry and fragment size fractions were determined by microchip electrophoresis. [18F]F-FDG PET/CT was performed and standardised uptake values (SUV), metabolic tumour volume (MTV) and total lesion glycolysis (TLG) were calculated for primary, extrapulmonary and total disease. CT scans were evaluated according to RECIST 1.1 criteria.
Results
CfDNA concentration showed a positive correlation with extrapulmonary MTV (r2 = 0.36, P = 0.009), and extrapulmonary TLG (r2 = 0.35, P = 0.009) and their whole-body (wb) ratios. Higher concentrations of total cfDNA were found in patients with liver lesions. Short fragments of cfDNA (100–250 bp) showed a positive correlation with extrapulmonary MTV (r2 = 0.49, P = 0.0005) and extrapulmonary TLG (r2 = 0.39, P = 0.006) and their respective wb ratios, and a negative correlation with SUVmean (r2 = −0.31, P = 0.03) and SUVmean/SUVmax ratio (r2 = −0.34, P = 0.02). A higher fraction of short cfDNA fragments was found in patients with liver and pleural lesions.
Conclusions
This study supports the hypothesis that cfDNA concentration and short cfDNA fragment size fraction reflect the tumour burden as well as metabolic activity in advanced NSCLC patients. This suggests their suitability as complementary tests for a more accurate diagnosis of tumour metabolic behaviour and to allow personalised therapies.
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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors would like to dedicate this manuscript to Dr. Rafael Molina, who recently passed away. His dedication and passion to the field of cancer diagnosis were an inspiration to all of us. The authors thank the patients for their participation in the study and the study staff who were involved in collecting specimen material at the study sites. The authors would like to express our gratitude to Dr. James Hugall for providing language assistance for the manuscript.
Funding
Hoffman-La Roche Ltd. supplied the reagent cobas® cfDNA Sample Preparation Kit for cfDNA extraction.
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Conceptualisation: JM. González de Aledo-Castillo, I. Vollmer, P. Paredes, JA. Puig-Butillé; data curation: JM. González de Aledo-Castillo, S. Casanueva-Eliceiry, A. Soler, V. Pastor, N. Reguart, N. Viñolas, R. Reyes, I. Vollmer, P. Paredes, JA. Puig-Butillé; formal analysis: JM. González de Aledo-Castillo; investigation: JM. González de Aledo-Castillo, I. Vollmer, P. Paredes, JA. Puig-Butillé; methodology: JM. González de Aledo-Castillo, JA. Puig-Butillé; project administration: P. Paredes, JA. Puig-Butillé; resources: P. Paredes, I. Vollmer, D. Fuster, N. Reguart, JA. Puig-Butillé; supervision: P. Paredes, JA. Puig-Butillé; visualisation: JM. González de Aledo-Castillo, I. Vollmer, P. Paredes, JA. Puig-Butillé; writing – original draft: JM. González de Aledo-Castillo: writing – review and editing: JM. González de Aledo-Castillo, I. Vollmer, P. Paredes, N. Reguart, JA. Puig-Butillé. All authors read and approved the final manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of Hospital Clinic de Barcelona (approval registration number HCB/2016/0889).
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González de Aledo-Castillo, J., Casanueva-Eliceiry, S., Soler-Perromat, A. et al. Cell-free DNA concentration and fragment size fraction correlate with FDG PET/CT-derived parameters in NSCLC patients. Eur J Nucl Med Mol Imaging 48, 3631–3642 (2021). https://doi.org/10.1007/s00259-021-05306-2
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DOI: https://doi.org/10.1007/s00259-021-05306-2