Application of transrectal elastography and contrast-enhanced ultrasound in evaluation of the efficacy of neoadjuvant therapy for rectal cancer
10.3760/cma.j.issn.1004-4477.2017.04.009
- VernacularTitle:经直肠超声弹性成像及超声造影量化分析在评价直肠癌新辅助治疗效果中的应用
- Author:
Rui YANG
;
Ruijing YANG
;
Binying MIN
;
Xiangzhou SHI
;
Rong REN
;
Yilin YANG
;
Yunyou DUAN
- Keywords:
Elasticity imaging techniques;
Contrast-enhanced ultrasound;
Rectal neoplasms;
Neoadjuvant therapy
- From:Chinese Journal of Ultrasonography
2017;26(4):315-319
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the value of transrectal elastography and contrast-enhanced ultrasound in evaluation of the efficacy of neoadjuvant therapy for rectal cancer.Methods Forty patients with final diagnosis of advanced(T≥3) rectal cancer were respectively examined with transrectal ultrasound (TRUS),endorectal elastography and contrast-enhanced ultrasound(CEUS) before and after neoadjuvant therapy(NET).The tumor size,strain ratio and quantitative parameters of contrast-enhanced ultrasound including arrival time(AT),time-to-peak (TTP),peak intensity(PI) and area under the curve(AUC) were recorded and compared before and after NET.In addition,the TRUS stages and postoperative pathological diagnosis were compared after NET.Results ①There were significant decreases in tumor size and strain ratio after the therapy compared with pre-therapy in all these patients(t =-6.13,P ＜0.001;t =-24.92,P ＜ 0.001).②PI and AUC were lower after NET than those of pre-therapy and the differences were significant(t =-9.66,P =0.001;t =-13.58,P ＜0.001).However,the changes of AT and TTP were no statistical significances (t =-1.17,P =0.307;t =-1.26,P =0.275).③The accuracys of preoperative TRUS for T stage and N stage of tumor evaluated according to pathology were respectively 75.0 ％ (30/40,Kappa =0.593,P =0.000) and 72.5 ％ (29/40,Kappa =0.396,P =0.009).Conclusions Transrectal elastography and contrast-enhanced ultrasound can reflect the pathological changes and perfusion characteristics of lesions in a certain extent and have high value in clinical therapy.
