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Rapado-González Ó, López-Cedrún JL, Lago-Lestón RM, Abalo A, Rubin-Roger G, Salgado-Barreira Á, López-López R, Muinelo-Romay L, Suárez-Cunqueiro MM. Integrity and quantity of salivary cell-free DNA as a potential molecular biomarker in oral cancer: A preliminary study. J Oral Pathol Med 2022; 51:429-435. [PMID: 35416334 PMCID: PMC9322526 DOI: 10.1111/jop.13299] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 03/20/2022] [Accepted: 03/30/2022] [Indexed: 11/28/2022]
Abstract
Background Differences in cell‐free DNA (cfDNA) fragments have been described as a valuable tool to distinguish cancer patients from healthy individuals. We aim to investigate the concentration and integrity of cfDNA fragments in saliva from oral squamous cell carcinoma (OSCC) patients and healthy individuals in order to explore their value as diagnostic biomarkers. Methods Saliva samples were collected from a total of 34 subjects (19 OSCC patients and 15 healthy controls). The total concentration of salivary cfDNA (scfDNA) was determined using a fluorometry method and quantitative real‐time polymerase chain reaction (qPCR). To evaluate the scfDNA quantity and integrity, qPCR targeting Arthobacter luteus (ALU) sequences at three amplicons of different lengths (60, 115, and 247 bp, respectively) was carried out. ScfDNA integrity indexes (ALU115/ALU60 and ALU247/ALU60) were calculated as the ratio between the absolute concentration of the longer amplicons 115 bp and 247 bp and the total scfDNA amount (amplicon 60 bp). Results The total scfDNA concentration (ALU60) was higher in OSCC than in healthy donors, but this trend was not statistically significant. The medians of scfDNA integrity indexes, ALU115/ALU60 and ALU247/ALU60, were significantly higher in OSCC, showing area under the curve values of 0.8211 and 0.7018, respectively. Conclusion Our preliminary results suggest that scfDNA integrity indexes (ALU115/ALU60 and ALU247/ALU60) have potential as noninvasive diagnostic biomarkers for OSCC.
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Affiliation(s)
- Óscar Rapado-González
- Department of Surgery and Medical-Surgical Specialties, Medicine and Dentistry School, Universidade de Santiago de Compostela, Santiago de Compostela, Spain.,Liquid Biopsy Analysis Unit, Translational Medical Oncology Group (Oncomet), Health Research Institute of Santiago IDIS, Complexo Hospitalario Universitario de Santiago de Compostela (SERGAS), Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Cáncer CIBERONC, Instituto de Salud Carlos III, Madrid, Spain
| | - José Luis López-Cedrún
- Department of Oral and Maxillofacial Surgery, Complexo Hospitalario Universitario de A Coruña SERGAS, A Coruña, Spain
| | - Ramón Manuel Lago-Lestón
- Liquid Biopsy Analysis Unit, Translational Medical Oncology Group (Oncomet), Health Research Institute of Santiago IDIS, Complexo Hospitalario Universitario de Santiago de Compostela (SERGAS), Santiago de Compostela, Spain
| | - Alicia Abalo
- Liquid Biopsy Analysis Unit, Translational Medical Oncology Group (Oncomet), Health Research Institute of Santiago IDIS, Complexo Hospitalario Universitario de Santiago de Compostela (SERGAS), Santiago de Compostela, Spain
| | - Guillermo Rubin-Roger
- Department of Oral and Maxillofacial Surgery, Complexo Hospitalario Universitario de A Coruña SERGAS, A Coruña, Spain
| | - Ángel Salgado-Barreira
- Department of Preventive Medicine, Universidade de Santiago de Compostela, Santiago de Compostela, Spain.,Epidemiology, Health Public and Health Technology Assessment, Health Research Institute of Santiago de Compostela (IDIS), Complexo Hospitalario Universitario de Santiago de Compostela (SERGAS), Santiago de Compostela, Spain
| | - Rafael López-López
- Translational Medical Oncology Group (Oncomet), Health Research Institute of Santiago (IDIS), Complexo Hospitalario Universitario de Santiago de Compostela (SERGAS), Santiago de Compostela, Spain
| | - Laura Muinelo-Romay
- Liquid Biopsy Analysis Unit, Translational Medical Oncology Group (Oncomet), Health Research Institute of Santiago IDIS, Complexo Hospitalario Universitario de Santiago de Compostela (SERGAS), Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Cáncer CIBERONC, Instituto de Salud Carlos III, Madrid, Spain
| | - María Mercedes Suárez-Cunqueiro
- Department of Surgery and Medical-Surgical Specialties, Medicine and Dentistry School, Universidade de Santiago de Compostela, Santiago de Compostela, Spain.,Centro de Investigación Biomédica en Red de Cáncer CIBERONC, Instituto de Salud Carlos III, Madrid, Spain.,Translational Medical Oncology Group (Oncomet), Health Research Institute of Santiago (IDIS), Complexo Hospitalario Universitario de Santiago de Compostela (SERGAS), Santiago de Compostela, Spain
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