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

• 结直肠癌实验室精准诊断专题 • 上一篇    下一篇

粪便SDC2甲基化联合m3基因检测在结直肠癌诊断中的临床价值

胥俊越, 赵亚虹, 王梦阳, 张莎娜, 李奕, 贾淑静, 王志华, 郭为为, 蔡月, 曹司()   

  1. 首都医科大学电力教学医院北京 100073
  • 收稿日期:2024-08-28 修回日期:2025-06-06 出版日期:2026-04-30 发布日期:2026-05-07
  • 通讯作者: 曹 司,E-mail:wosicaosi@126.com
  • 作者简介:胥俊越,性别,男,1987年生,硕士,副主任技师,主要从事分子生物学检验工作。
  • 基金资助:
    首都卫生发展科研项目(2022-2G-40210);国中康健科技项目(SGTYHT/21-JS-223)

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

摘要:

目的 探讨粪便脱落细胞黏结蛋白聚糖2(SDC2)基因甲基化、粪菌m3基因与血清肿瘤标志物[癌胚抗原(CEA)、糖类抗原(CA)125、CA19-9]联合检测在结直肠癌(CRC)早期筛查中的价值。方法 选取2021年1月—2023年12月首都医科大学电力教学医院CRC患者60例(CRC组)、结直肠腺瘤患者40例(腺瘤组)和对照者(肠镜检查无异常、无息肉或慢性炎症)40例(对照组)。采用实时荧光定量聚合酶链反应(PCR)检测从粪便样本中提取的脱落细胞SDC2基因甲基化水平和粪菌m3基因相对丰度,同时检测血清CEA、CA125、CA19-9水平。采用Logistic回归分析评估CRC发生的影响因素。采用受试者工作特征(ROC)曲线评估SDC2甲基化、m3基因、CEA、CA125、CA19-9单项检测和联合检测诊断CRC的效能。结果 对照组、腺瘤组、CRC组粪便SDC2甲基化阳性率和m3基因相对丰度依次升高(P<0.001);年龄较大、m3基因相对丰度升高和SDC2甲基化阳性是CRC发生的危险因素(P<0.05)。SDC2甲基化、m3基因、CEA、CA125和CA19-9单项检测诊断CRC的曲线下面积(AUC)分别为0.888、0.867、0.719、0.713和0.748;SDC2甲基化+m3基因和CEA+CA125+CA19-9诊断CRC的AUC分别为0.958和0.778,鉴别诊断腺瘤与早期(Ⅰ~Ⅱ期)CRC的AUC分别为0.835、0.672。结论 粪便SDC2甲基化和m3基因检测快速、简便,且无创,可作为早期CRC筛查和诊断的潜在生物标志物,二者联合检测的效能更高。

关键词: 黏结蛋白聚糖2, DNA甲基化, m3基因, 结直肠癌, 粪便样本, 早期筛查

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

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