多期动态增强MRI对宫颈癌放化疗短期疗效的评价价值

目的 探讨多期动态增强MRI(MDCE-MRI)在宫颈癌放化疗短期疗效评价方面的应用价值.方法 收集经病理证实且准备行放化疗的宫颈癌患者21例,分别在治疗前、治疗第15天、1个月、2个月对其进行MR常规扫描和MDCE-MRI扫描.根据治疗结束后肿块体积变化,将病例主要分成完全缓解组(CR组)和部分缓解组(PR组).分析时间-信号强度曲线(TIC)、平均强化时间(MTE)、达峰时间(TTP)、最大上升斜率(MSI)、最大下降斜率(MSD)、负性积分(NEI)与肿块最终体积变化的关系.结果 本组病例在经过系统放化疗2个月后,CR组有4例,PR组有17例.治疗前MSI与肿瘤缩小率呈显著负相关,NEI与肿瘤缩小率呈显著正相关,相关系数r分别为-0.877、0.819;治疗后15 d TTP及NEI变化率与肿瘤最终缩小率呈显著正相关,r分别为0.765、0.775.说明治疗前MSI、NEI与治疗后15 d TTP变化率、NEI变化率可有预测放化疗后肿瘤体积缩小率的作用.系统放化疗1个月后,各参数的曲线下面积(AUC)值以NEI变化率最大,当其≥96.46%这一临界值时,敏感性为82.4%,特异性为75%.各参数的TIC分析结果为Ⅰ型逐渐增多,Ⅲ型逐渐减少至消失.结论 MDCE-MRI中各参数对宫颈癌放化疗短期疗效的评价有一定价值,其中以MSI、TTP及NEI更为敏感.

The application value of MDCE-MRI in the early chemoradiation efficacy in cervical cancer

Objective To explore the application value of multiphase dynamic contrast-enhanced MRI (MDCE-MRI) in the early chemoradiation efficacy in cervical cancer.Methods Twenty-one patients with cervical cancer received chemoradiation.Routine MR scan and MDCE-MRI scan were examined at different stages, including pre-treatment, 15 days,1 month and 2 months after treatment.According to volume change of the tumor after treatment, the cases were mainly divided into complete remission(CR), partial remission (PR).The correlation between volume change of cancer after treatment and the time-signal intensity curve (TIC),mean time to enhancement(MTE),time to peak(TTP),maximum slope of increase(MSI),maximum slope of decrease(MSD), negative enhancement integral (NEI) were analysed.Results After system chemoradiation for 2 months,4 of enrolled patients got complete remission and 17 partial remission.The reduction rate of the tumor diameter was negatively correlated to MSI values(r=-0.877,P<0.05) and positively related with NEI (r=0.819,P<0.05) before the treatment.15 days after the treatment, the diminished rate of the tumor diameter had active relation with change of TTP(r=0.765,P<0.05) and NEI(r=0.775,P<0.05).It indicated that MSI and NEI values before cervical cancer chemoradiation and the variation of TTP and NEI after treatment for 15 days could help predict the variation tendency of cancer diameter.Chemoradiation and therapy 1 month later,for all the parameters' AUC values,the change rate of NEI were the largest one.When the critical value was not less than 96.46%, the sensitivity was 82.4%, specificity was 75%.TIC curve of type Ⅰ increased, type Ⅲ decreased to disappear gradually.Conclusion MDCE-MRI can be used to predict the efficacy of chemoradiation in cervical cancer patients, of which the MSI, TTP and NEI are more sensitive.