DCE-MRI time–intensity curve visual inspection to assess pathological response after neoadjuvant therapy in locally advanced rectal cancer

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Abstract

Purpose: To investigate the potential of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) to discriminate responder from non-responder patients after preoperative chemoradiotherapy (pCRT) in locally advanced rectal cancer (LARC). Materials and methods: One hundred and fifty-eight consecutive patients were enrolled in this prospective study. We compared morphological MRI (mMRI) using T2-weighted images about tumor presence and invasiveness, and functional DCE-MRI using time–intensity curve (TIC) visual inspection (qMRI), classifying TIC shape into three types: type 1, persistent enhancement; type 2, high enhancement with plateau; type 3, high enhancement with wash-out. Clinical TNM was obtained before and after CRT by radiological consensus of two expert radiologists. Pathological tumor–nodes–metastasis classification and tumor regression grade (TRG) were confirmed as the golden standard. Non-parametric test, sensitivity, specificity, and positive and negative predictive values were calculated. Results: Ninety-eight patients (62%) were classified as responders (TRG ≤ 2), while 60 (38%) were classified as non-responders. Sensitivity, specificity, and accuracy were 52, 78, and 62% for mMRI, and 81, 85, and 82% for qMRI, respectively. Conclusions: TIC visual inspection may be one of the potential biomarkers over morphological analysis using DCE-MRI data to assess pathological response after pCRT in LARC.

Original languageEnglish
JournalJapanese Journal of Radiology
DOIs
Publication statusPublished - 2018

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Keywords

  • DCE-MRI
  • Functional assessment
  • Neoadjuvant therapy
  • Rectal cancer
  • Tumor response

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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