Laboratory Medicine ›› 2026, Vol. 41 ›› Issue (4): 355-361.DOI: 10.3969/j.issn.1673-8640.2026.04.007

Previous Articles     Next Articles

Role of fecal SDC2 methylation combined with m3 gene determination in the diagnosis of colorectal cancer

XU Junyue, ZHAO Yahong, WANG Mengyang, ZHANG Shana, LI Yi, JIA Shujing, WANG Zhihua, GUO Weiwei, CAI Yue, CAO Si()   

  1. Electric Power Teaching Hospital of Capital Medical UniversityBeijing 100073, China
  • Received:2024-08-28 Revised:2025-06-06 Online:2026-04-30 Published:2026-05-07

Abstract:

Objective To investigate the role of combined determination of syndecan-2(SDC2) methylation in fecal shed cells,fecal m3 gene and serum tumor markers [carcinoembryonic antigen(CEA),carbohydrate antigen(CA) 125,CA19-9] in the early screening of colorectal cancer(CRC). Methods Totally,60 CRC patients(CRC group),40 patients with colorectal adenoma(adenoma group) and 40 controls without abnormalities,polyps or chronic inflammation found during colonoscopy(control group) were enrolled from January 2021 to December 2023 at the Electric Power Teaching Hospital of Capital Medical University. The methylation level of SDC2 gene and the expression level of m3 gene in fecal shed cells were determined by real-time fluorescence quantitative polymerase chain reaction(PCR),and the levels of serum CEA,CA125 and CA19-9 were determined. Logistic regression analysis was used to evaluate the influencing factors of CRC occurrence. Receiver operating characteristic(ROC) curve was used to assess the efficacy of SDC2 methylation,m3 gene,CEA,CA125,CA19-9 single determinations and combined determination in the early screening of CRC. Results The positive determination rates of SDC2 methylation and the expression levels of m3 gene were decreased successively in CRC group,adenoma group and control group(P<0.001). Elder,m3 gene expression and positive SDC2 methylation were independent risk factors for CRC occurrence(P<0.05). The areas under curves(AUC) of SDC2 methylation,m3 gene,CEA,CA125 and CA19-9 single determinations for diagnosing CRC were 0.888,0.867,0.719,0.713 and 0.748,respectively. The AUC of combined determination of SDC2 methylation and m3 gene and combined determination of CEA,CA125 and CA19-9 were 0.958 and 0.778,respectively,and the AUC for diagnosing adenoma and stage Ⅰ/Ⅱ CRC were 0.835 and 0.672,respectively. Conclusions The determinations of fecal SDC2 methylation and m3 gene are rapid,simple and non-invasive,and they are potential for CRC screening and diagnosis,especially their combined determination.

Key words: Syndecan-2, DNA methylation, M3 gene, Colorectal cancer, Feces, Early screening

CLC Number: