Gastroenterology:循环核酸与胰腺癌患者的预后相关

2019-01-06 MedSci MedSci原创

循环核酸是否可以作为胰腺癌预后的预测指标一直存在争议,因此,本项研究旨在研究循环肿瘤细胞DNA(ctDNA)和外泌体DNA(exoDNA)在胰腺癌中的临床应用。

背景与目的
循环核酸是否可以作为胰腺癌预后的预测指标一直存在争议,因此,本项研究旨在研究循环肿瘤细胞DNA(ctDNA)和外泌体DNA(exoDNA)在胰腺癌中的临床应用。

方法
研究人员收集了2015年4月7日至2017年10月13日接受局部或转移性胰腺癌治疗的194名患者的液体活检样本(在基线和治疗期间收集的425份血液样本)。从37名疾病控制个体收集额外的液体活检样品。聚合酶链反应用于确定来自ctDNA的KRAS突变等位基因部分(MAF)和从血浆中纯化的exoDNA。对于纵向分析,研究人员分析了来自34名患者的123个系列血液样品中的exoDNA和ctDNA。采用包括Cox回归,Fisher精确检验和贝叶斯推断在内的分析,将exoDNA和ctDNA 中的KRAS MAF与预后和预测结果联系起来。

结果
在34例可能可切除的肿瘤患者中,新辅助治疗后exoDNA水平的增加与疾病进展显着相关(P  = .003),而ctDNA未显示与胰腺癌预后的相关性。在手术切除的组织中存在并且在液体活检样品中检测到的KRAS突变的一致率大于95%。在单变量分析中,基线状态转移和可检测的ctDNA患者的无进展生存期(PFS)显着缩短(死亡风险比[HR],1.8; 95%CI,1.1-3.0; P  = .019),和总生存(OS)(HR,2.8; 95%CI,1.4-5.7; P. = .0045)。在多变量分析中,exoDNA中MAFs≥5%是PFS的显着预测因子(HR,2.28; 95%CI,1.18-4.40; P  = .014)。多分析方法显示, 在多变量分析中,在基线状态下检测到≥5%的ctDNA和exoDNA MAF是总生存期的显着预测因子(HR,7.73,95%CI,2.61-22.91,P = .00002)。在纵向分析中,exoDNA中MAF峰值高于1%与放射学进展显着相关(P  = .0003)。

结论
本项研究的结果展示了如何使用液体活检样本通过exoDNA和ctDNA进行纵向监测,提供与治疗分层相关的预测和预后信息,为胰腺癌患者的预后提供了新的生物指标。

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    2019-01-15 许安
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