Abstract
Background
Gastric adenocarcinoma is a prevalent form of cancer that often remains undetected in its early stages due to the lack of specific symptoms. This delayed diagnosis leads to poor clinical outcomes, underscoring the need for an effective and non-invasive method for early detection. Recent advances in cancer epigenetics have led to the identification of biomarkers that have the potential to revolutionize the early detection and monitoring of this disease. One such promising biomarker is the methylation of the FGFR2 promoter. This study aims to measure the methylation levels of a specific CpG site in the FGFR2 promoter gene in DNA extracted from blood leukocytes from patients with intestinal metaplasia, gastric cancer, and healthy control.
Material and methods
The CpG site of the FGFR2 gene promoter was identified in its control region. Methylation alteration of the selected FGFR2 CpG site was determined through the (methylation-sensitive restriction enzyme) MSRE-qPCR. Genomic DNA was extracted from one hundred twenty-five participants.
Results
The normal group had mean methylation levels of 93.23 ± 4.929%, while the IM group had a level of 69.85 ± 27.15%. In GC patients, the levels varied, with 25.96 ± 18.98% in the intestinal type and 28.30 ± 16.07% in the diffuse type. The methylation levels in the IM and GC patients were significantly lower than those in the normal control group. However, no significant difference was observed between the methylation status of the intestinal type of GC and the diffuse type. The Receiver operating characteristic (ROC) curve analysis showed that FGFR2 CpG methylation levels in GC patients compared to normal controls had a high sensitivity of 100% and specificity of 100%, with a cut-off of < 74.25%; when GC patients were compared to IM patients, the sensitivity was 85%, and the specificity was 80%, with a cut-off < 44.45%.
Conclusions
The potential of the FGFR2 methylation status as a non-invasive biomarker lies in its ability to be detected in blood leukocytes, which makes it a promising tool for the early detection of intestinal metaplasia and gastric cancer. This could significantly improve the detection and management of these gastric conditions.
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Data availability
The data generated and/or analyzed during the current study are not publicly available but are available from the corresponding author who organized the study.
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Acknowledgements
We are grateful for the support of grant number 667 from the National Institute of Genetic Engineering and Biotechnology (NIGEB). Our work would not have been possible without their generous funding.
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The study was funded by grant 667 from the National Institute of Genetic Engineering and Biotechnology (NIGEB).
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SAA developed the concepts and methodology for the experimental study, and AM developed the concepts and methodology for the computational-based study. NA and MA carried out the sampling and experimental laboratory work. SAA was responsible for data acquisition, analysis, and interpretation of experimental studies, and AM conducted comprehensive bioinformatic studies and analysis. AM and SAA collaborated on manuscript writing and revisions. SAA provided administrative, technical/material support, provided raw experimental data, and supervised the study. All authors read and approved the final manuscript.
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The study underwent a rigorous ethical review process by the Ethical Committee of the National Institute of Genetic Engineering and Biotechnology (NIGEB) before its approval (Ethical code #: IR.NIGEB.EC1398.12.3.A). The research team followed all relevant guidelines and regulations to ensure all participants’ safety and well-being. Participants were fully informed of the research’s purpose and procedures and provided an informed consent form before participating. The consent form detailed the use of their clinical samples and personal data throughout the study, which was to be conducted under their physician’s supervision. The research team prepared the informed consent form with the utmost care, and all participants willingly signed it before participating. Participants were free to withdraw their consent at any point during the study. Throughout the study, the research team upheld the highest ethical standards and strictly adhered to all relevant regulations to ensure the privacy and confidentiality of all participants’ data.
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Aleyasin, S.A., Moradi, A., Abolhasani, N. et al. Investigating FGFR2 gene as a blood-based epigenetic biomarker in gastric cancer. Mol Biol Rep 51, 253 (2024). https://doi.org/10.1007/s11033-023-09082-0
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DOI: https://doi.org/10.1007/s11033-023-09082-0