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European Radiology:如何应用CT预测胃癌的EMT分子亚型?

2022-02-15 shaosai MedSci原创

最近,ACRG(亚洲癌症研究小组)将胃癌(GC)划分为四个不同的分子亚型,其中EMT亚型表现出极差的预后,手术后复发率很高。

最近,ACRG(亚洲癌症研究小组)将胃癌(GC)划分为四个不同的分子亚型(1)具有微卫星不稳定性(MSI)的肿瘤;(2)具有p53特征(CDKN1A和MDM2表达)的微卫星稳定(MSS)肿瘤;(3)没有p53特征的MSS肿瘤;(4)具有上皮-间质转化(EMT)表型的MSS肿瘤。在这四种不同的亚型中,EMT亚型表现出极差的预后,手术后复发率很高。EMT亚型的特点是腹膜种植转移发生率高,与其他亚型相比发病年龄小,Lauren分类中以弥漫型为主。相比之下,MSI GC预后良好,手术后复发的比例较小。

尽管分子亚型在临床上很重要,但基因表达谱分析检查十分昂贵,且无法作为GC患者的常规筛查项目来实施。CT扫描是GC患者的首选影像学检查手段已有研究报道了与弥漫型GC或SRCC相关的几个CT特征,如门静脉期胃壁无分层(或分层性差)增厚以及SRCC胃癌的增强较强。现阶段建立一个在日常工作中容易获得基于临床病理特征的准确预测GC亚型的评估模型意义重大

近日,发表在European Radiology杂志的一项研究建立包括CT图像在内的EMT亚型预测模型,并建立一个包含已知临床病理变量的列线图以实现患者的化EMT亚型的评估为患者治疗方案的制定及预后评估提供了强有力的支持

本项研究对接受胃癌(GC)切除术患者CT图像和分子亚组(n = 451)进行了分析。采用逐步选择变量的方法进行多变量分析,建立EMT亚型GC的预测模型。利用多变量分析的结果构建了一个列线图。确定了用于预测EMT亚型的提名图总预后点的最佳截值。EMT亚型的预测模型通过bootstrap再抽样方法进行了内部验证。 

根据转录组分析,共评估了88名EMT亚型的患者和363名非EMT亚型的患者。患者的年龄、Lauren 分类和CT上的壁层是预测模型选择的变量。该模型的曲线下面积(AUC)为0.865,引导样本的验证AUC为0.860。预测EMT亚型的总预后点的最佳截值为94.622,敏感性为90.9%,特异性为67.2%,准确性为71.8%。 

 

 EMT分子亚型胃癌预测模型的ROC曲线和1000个引导样本的ROC曲线。预测模型的曲线下面积(AUC)为0.865,95%的置信区间(CI)为0.828-0.902,1000个引导样本的平均AUC为0.860,95%的CI为0.859-0.861,表明EMT亚型的预测模型有效

本研究表明利用患者的年龄、Lauren分类和CT的情况建立一个预测EMT分子亚型GC的预测模型该模型可作为一个十分有价值的筛查工具,并实现对EMT亚型的个体化评估

原文出处

Dong Ik Cha,Jeeyun Lee,Woo Kyoung Jeong,et al.Prediction of epithelial-to-mesenchymal transition molecular subtype using CT in gastric cancer.DOI:10.1007/s00330-021-08094-3

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    2022-03-16 feather89
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    2022-05-12 snail 3680

    厉害👍

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    2022-02-17 lfcmxl

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