多参数MR成像预测非切除肝内胆管细胞型肝

Purpose:Todeterminetheperformanceofmagneticresonance(MR)imaging–basedtumormetricsforevaluationofresponsetotransarterialchemoembolization(TACE)inpatientswithunresectableintrahepaticcholangiocarcinoma(ICCA).

目的:探讨磁共振(MR)成像对经肝动脉化疗栓塞(TACE)治疗肝内胆管癌(ICCA)患者疗效的影响。

MaterialsandMethods:Ninety-fourpatientswithunresectableICCAunderwentbaselineandfollow-upMRimagingafterTACEandwerefollowedupuntildeathorendofstudyduration.Lesionswereanalyzedforanatomic(ResponseEvaluationCriteriainSolidTumors[RECIST]andtumorvolume)andfunctional(viabletumorvolume,viabletumorburden,andapparentdiffusioncoeffcient[ADC])volumetricMRparametersbyusingsemiautomaticsoftware.ResponsewasassessedbyusingchangesinviabletumorvolumebyusingmodifedRECIST(mRECIST)–derivedthresholds(threedimensionalmRECIST),viabletumorburden,andADC.Overallsurvivalwastheprimaryendpoint.Cox-regressionandKaplan-Meiersurvivalanalysiswereused.

材料和方法:94名不可切除肝内胆管癌的患者在TACE治疗前接受基线磁共振成像检查,并于TACE治疗后接受磁共振成像检查随访,直至死亡或研究结束。采用半自动软件分析病变部位的解剖(实体肿瘤疗效评估标准[RECIST]和肿瘤体积)和功能(存活肿瘤体积,存活肿瘤负荷和表观扩散系数[ADC])MR容积参数。通过存活肿瘤体积变化(三维mRECIST),存活肿瘤负荷和ADC值来评估疗效。总生存期是主要研究终点。统计学方法采用Cox回归和Kaplan-Meier生存分析。

Results:TumorvolumedidnotchangeafterTACE(P=.07)whereasRECISTdiametershowedasmallchange(22.6%;P=.02).TherewasanincreaseinADC(20.7%)andadecreaseinviabletumorvolume(-29.3%)andviabletumorburden(-29.1%;P,.forall).Higheroverallsurvivalwasnotedamongrespondersbyusingthresholdsof25%increaseinADC,66%decreaseinviabletumorvolume,and50%decreaseinviabletumorburden(log-ranktest,P,.05).HazardratiofornonrespondersbyusingADC,three-dimensionalmRECIST,andviabletumorburdenatmultivariableanalysiswas2.9(P=.),4.1(P=.),and4.0(P=.),respectively.Survivaldifferenceswerenotedforpatientswhoshowedresponsebyusingallthreeparameters(ADC,three-dimensionalmRECIST,andviabletumorburden)versusthosewhoshowedresponsebyusingeitheroneortwooftheseparametersversusthosewhoshowednoresponse(P,.).

结果:TACE术后的RECIST直径有微小的变化(22.6%,P=0.02),而肿瘤体积无显著变化(P=0.07)。ADC显著升高(20.7%),存活肿瘤体积明显缩小(-29.3%),存活肿瘤负荷明显降低(-29.1%;以上所有P<0.)。治疗应答者总生存率更高(ADC增加阈值为25%,存活肿瘤体积缩小阈值为66%,存活肿瘤负荷减轻的阈值为50%,Log-rank检验P<0.05)。多变量分析显示,无应答者死亡风险更高。经ADC,三维mRECIST和存活肿瘤负荷评估得出的无应答者HR分别为,2.9(P=0.),4.1(P=0.),以及4.0(P=0.)。与无应答者相比,经三种参数确认的应答者和经两种、甚至一种参数确认的应答者相比,生存情况显著不同(三种参数为ADC,三维mRECIST和存活肿瘤负荷,P<0.)。

Conclusion:ChangesinvolumetricADC,viabletumorvolume,andviabletumorburdenatMRimagingprovideprognosticinformationamongpatientswithunresectableICCAwhoundergoTACE.

结论:磁共振成像中的容积ADC,存活肿瘤体积和存活肿瘤负荷的改变能为接受TACE治疗的不可切除肝内胆管癌患者提供预后信息。

文章来源:约翰霍普金斯大学医学院RussellHMorgan放射学和放射科学系

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