常规超声及超声造影特征与肝内胆管癌表达Ki-67水平的相关性

Correlations of conventional ultrasound and contrast-enhanced ultrasound features with Ki-67 expression level of intrahepatic cholangiocarcinoma

目的观察肝内胆管癌(ICC)常规超声及超声造影(CEUS)特征与其表达Ki-67水平的相关性。方法回顾性分析77例经病理确诊的ICC患者,根据目标病灶Ki-67表达水平将其分为高表达组(Ki-67≥20%,n=53)及低表达组(Ki-67<20%,n=24),比较组间常规超声及CEUS特征;将组间差异有统计学意义的变量纳入多因素logistic回归分析,筛选与ICC表达Ki-67水平相关的超声特征。结果Ki-67高表达组ICC平均最大径大于低表达组[(6.2±2.0)cm vs.(5.2±1.9)cm,P=0.041],最大径>5 cm ICC占比高于低表达组(66.04%vs.33.33%,P=0.007)。组间常规超声所见ICC形态、边界及内部回声表现差异均无统计学意义(P均>0.05)。CEUS中,高表达组ICC呈周边环状增强及增强后病灶范围较前增大者占比均高于低表达组(P均<0.05);组间ICC增强模式、病灶内部是否存在无增强区及峰值强度差异均无统计学意义(P均>0.05)。病灶最大径>5 cm(OR=5.612,P=0.004)及周边环状增强(OR=3.880,P=0.025)为预测ICC高表达Ki-67的独立因子。结论ICC病灶最大径>5 cm、CEUS呈周边环状增强提示其可能高表达Ki-67,有助于临床制定治疗决策。

Objective To observe the correlations of conventional ultrasound and contrast-enhanced ultrasound(CEUS)features with expression level of Ki-67 of intrahepatic cholangiocarcinoma(ICC).Methods A total of 77 patients with pathologically confirmed ICC were retrospectively enrolled.According to the expression level of Ki-67 of target lesions,the patients were divided into high expression group(Ki-67≥20%,n=53)and low expression group(Ki-67<20%,n=24).The features showed on conventional ultrasound and CEUS were compared between groups,and the variables being significantly different were analyzed with multivariate logistic regression to select ultrasonic features being correlated with Ki-67 expression level of ICC.Results The mean maximum diameter of ICC in high expression group was larger than that in low expression group([6.2±2.0]cm vs.[5.2±1.9]cm,P=0.041),and the percentage of ICC with maximum diameter>5 cm in high expression group was higher than that in low expression group(66.04%vs.33.33%,P=0.007).No significant difference of the lesions shape,border nor the internal echogenicity showed on conventional ultrasound was found between groups(all P>0.05).The percentage of ICC with peripheral rim enhancement and enlargement after enhancement in high expression group were both higher than those in low expression group(both P<0.05),but no significant difference of the enhancement pattern,the presence or absence of non-enhance area within the lesion nor the peak intensity of lesions was found between groups(all P>0.05).The maximum diameter larger than 5 cm(OR=5.612,P=0.004)and peripheral rim enhancement(OR=3.880,P=0.025)were both independent factors for predicting high Ki-67 expression level of ICC.Conclusion ICC with the maximum diameter larger than 5 cm and peripheral rim enhancement on CEUS might indicate high expression level of Ki-67,which was helpful for clinical treatment decisions.