摘要
目的评价外周血游离线粒体DNA(circulating cell free mitochondrial DNA, CCF mtDNA)在结直肠癌(colorectal cancer, CRC)患者组织中的表达及其临床意义。方法收集102例CRC患者的癌组织及癌旁组织标本、30例原发性CRC患者及体检健康者血浆标本,实时荧光定量PCR检测各组CCF mtDNA的表达水平,并分析CCF mtDNA含量与CRC患者临床病理参数的关系。ROC曲线分析其作为CRC筛查标志物的效能。结果 CRC患者癌组织中的CCF mtDNA含量(85.94±4.54)明显低于癌旁组织(183.10±7.59),差异有统计学意义(t=11.04,P<0.05)。低分化癌组织中的CCF mtDNA含量(57.75±5.26)明显低于中分化(92.64±5.68)及高分化(110.00±14.95)癌组织,差异有统计学意义(F=8.42,P<0.05)。CCF mtDNA含量高低与CRC患者的预后无关(χ~2=0.261,P=0.610)。CCF mtDNA筛查CRC的AUC~(ROC)为0.921,敏感性为0.833,特异性为0.933。结论 CCF mtDNA含量在癌组织中下降,但与预后无关,可能作为CRC的筛查标志物。
引文
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