Abstract

目的 评价基于高通量平行测序技术的无创产前检测(non-invasive prenatal testing using massively parallel sequencing,MPS-NIPT)筛查胎儿常见非整倍体的临床效果。 方法 通过前瞻性的研究方法,纳入2012年7月至2016年6月在广东省中山市博爱医院产前诊断中心行MPS-NIPT产前检查的单胎妊娠孕妇共4 271例。采集孕妇外周血,提取血浆游离胎儿DNA进行MPS-NIPT。MPS-NIPT高风险孕妇行产前诊断胎儿染色体分析。随访所有孕妇妊娠结局及新生儿生后3个月的健康状况。 结果 MPS-NIPT筛查胎儿非整倍体的高风险率为1.83%(78/4 271),经产前诊断确诊胎儿染色体异常55例。78例高风险病例中21-三体综合征高风险34例,18-三体综合征高风险13例,13-三体综合征高风险5例,性染色体数目异常高风险21例,其他染色体数目异常高风险5例。高风险病例中3例(1例为2-三体综合征高风险,2例为XXX-三体综合征高风险)拒绝行产前诊断胎儿染色体分析,另外75例行产前诊断胎儿染色体分析,检出55例胎儿染色体非整倍体,符合率为73.33%(55/75)。剔除流产和引产病例,有效随访3 734例,MPS-NIPT筛查常见非整倍体(21-三体综合征、18-三体综合征、13-三体综合征及性染色体数目异常)的总检出率为96.43%,总假阳性率为0.46%,总阳性预测值为76.06%,总准确率为99.49%。MPS-NIPT低风险病例中漏诊1例13-三体综合征和1例XYY-综合征。 结论 MPS-NIPT筛查胎儿常见非整倍体检出率高,假阳性率极低,可常规用于单胎妊娠胎儿常见非整倍的产前筛查。但对低风险孕妇应加强孕期监测,防止漏诊。

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