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• W2167474807 abstract "Abstract Introduction The diagnosis of microscopic lymph node metastasis in lung cancer is challenging despite the constant advances in tumor staging. The analysis of the methylation status of certain genes in lymph node samples could improve the diagnostic capability of conventional cyto-histological methods. The aim of this study was to demonstrate the feasibility of methylation studies using cytological lymph node samples. Methods A prospective study including 88 patients with a diagnosis or strong suspicion of non-small cell lung cancer, in which an echobronchoscopy was performed on mediastinal or hilar lymph nodes for diagnosis and/or staging purposes. DNA was extracted from cytological lymph node samples and sodium bisulfite modification was performed. Methylation studies for p16/INK4a and SHOX2 were accomplished by MS-qPCR and pyrosequencing. Results The methodology used in our study yielded optimal/good DNA quality in 90% of the cases. No differences in DNA concentration were observed with respect to the lymph node biopsied and final diagnosis. Methylation analyses using MS-qPCR and pyrosequencing were not possible in a small number of samples mainly due to low DNA concentration, inadequate purity, fragmentation and/or degradation as a consequence of bisulfite conversion. Conclusion Methylation quantification using MS-qPCR and pyrosequencing of cytological lymph node samples obtained using echobronchoscopy is feasible if an appropriate DNA concentration is obtained, notably contributing to the identification of epigenetic biomarkers capable of improving decision making for the benefit of potentially curable lung cancer patients." @default.
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• W2167474807 date "2014-06-01" @default.
• W2167474807 modified "2023-09-27" @default.
• W2167474807 title "Viability of Lymph Node Samples Obtained by Echobronchoscopy in the Study of Epigenetic Alterations in Patients With Lung Cancer" @default.
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• W2167474807 doi "https://doi.org/10.1016/j.arbr.2014.04.004" @default.
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