This invention relates to a
methylation site marker for assisting in the early diagnosis of
esophageal squamous cell carcinoma and its application, belonging to the field of
biomedical technology. The
methylation site marker is one or a combination of
methylation sites cg05064044, cg03395511, and cg21548813 in human
peripheral blood mononuclear cells, with
nucleotide sequences shown in SEQ ID NO. 1-3. This invention uses methylation
chip detection to find that the methylation levels of cg05064044, cg03395511, and cg21548813 in
peripheral blood mononuclear cells of
esophageal squamous cell carcinoma patients were significantly higher than those in healthy controls. Further analysis revealed that the methylation levels of cg05064044, cg03395511, and cg21548813 in PBMCs of
esophageal squamous cell carcinoma patients in both the training and validation cohorts were significantly higher than those in healthy controls. Finally, ROC
curve analysis confirmed that the three methylation sites cg05064044, cg03395511, and cg21548813 have good specificity and sensitivity, and have high diagnostic
efficacy when used alone or in combination for the diagnosis of esophageal squamous
cell carcinoma. They can be used as potential molecular markers for the diagnosis of esophageal squamous
cell carcinoma.