刘思野,文 露,侯 静,聂少麟,周菊梅,曹 芳,卢 强,覃玉卉,于小平
目的:探讨基线动态对比增强磁共振成像(dynamic contrast-enhanced magnetic resonance imaging,DCE-MRI)参数图纹理特征在预测直肠癌原发灶新辅助放化疗病理反应方面的价值。方法:搜集38例局部进展期的直肠癌患者治疗前的DCE-MRI及术后病理学检查资料,采用受试者工作特征(receiver operating characteristic,ROC)曲线比较治疗前DCE-MRI参数[容量转运常数(volume transfer constant,K trans )、速率常数(rate constant,K ep )、血浆容量分数(plasma volume fraction,fPV)、血管外细胞外间隙容量分数(extravascular extracellular volume fraction,V e )]及参数图纹理特征对原发灶病理学完全缓解(pathological complete response,pCR)的预测效能。结果:基线DCE-MRI参数值在pCR组与非pCR组间差异无统计学意义。与非pCR组相比,pCR组的偏度 Ve (Skewness Ve )、相关度 Kep (Correlat Kep )、差分方差 fPV(difference variance of fPV,DifVarnc fPV )、差分方差 Kep (difference variance of K ep ,DifVarnc Kep )、差分熵 fPV (difference entropy of fPV,DifEntrp fPV )、差分熵 Ve (difference entropy of V e ,DifEntrp Ve )、熵 fPV (Entropy fPV )、熵 Ve (Entropy Ve )、和平均数 fPV (sum average of fPV,SumAverg fPV )、和熵 fPV (sum entropy of fPV,SumEntrp fPV )及和熵 Ve (sum entropy of V e ,SumEntrp Ve )值更高,均数 Ve (Mean Ve )、角二阶矩 fPV (angular second moment of fPV,AngScMom fPV )、角二阶矩 Ve(angular second moment of V e ,AngScMom Ve )、对比度 ktrans (Contrast ktrans )、逆差矩 fPV (Inverse Difference Moment of fPV,InvDfMom fPV )、和平均数K trans (sum average of K trans ,SumAverg ktrans )及和平均数 Ve (sum average of V e ,SumAverg Ve )值更低。单个纹理特征预测pCR的ROC曲线的曲线下面积(area under curve,AUC)值为0.571~0.817;在多变量分析中,基于二级纹理特征构建的logistic回归模型预测pCR的AUC高于基于一级纹理特征构建的logistic回归模型(P=0.028)。结论:基线DCE-MRI参数图纹理特征可能在预测直肠癌原发灶新辅助放化疗病理反应状态方面有潜在价值。