Abstract
Objectives
To examine whether post-chemoradiotherapy (CRT) DCE-MRI can identify rectal cancer patients with pathologic complete response (pCR).
Methods
From a rectal cancer surgery database 2007–2014, 61 consecutive patients that met the following inclusion criteria were selected for analysis: (1) stage II/III primary rectal adenocarcinoma; (2) received CRT; (3) underwent surgery (4); underwent rectal DCE-MRI on a 1.5-T MRI scanner. Two experienced radiologists, in consensus, drew regions of interest (ROI) on the sagittal DCE-MRI image in the tumour bed. These were exported from ImageJ to in-house Matlab code for modelling using the Tofts model. K trans, K ep and v e values were compared to pathological response.
Results
Of the 61 initial patients, 37 had data considered adequate for fitting to obtain perfusion parameters. Among the 13 men and 24 women, median age 53 years, there were 8 pCR (22 %). K trans could not distinguish patients with pCR. For patients with 90 % or greater response, mean K trans and K ep values were statistically significant (p = 0.032 and 0.027, respectively). Using a cutoff value of K trans = 0.25 min−1, the AUC was 0.71.
Conclusion
K trans could be used to identify patients with 90 % or more response to chemoradiotherapy for rectal cancer with an AUC of 0.7.
Key Points
• Chemoradiotherapy for rectal cancer causes decreased blood flow and permeability in the tumour bed.
• Lower values of blood flow and permeability correlate with good tumour response.
• K trans of 0.25min −1 best identifies patients with ≥90 % response with AUC 0.71
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Acknowledgements
The scientific guarantor of this publication is Marc J. Gollub, MD. The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. This study has received funding by National Institutes of Health (P30 CA008748). Junting Zheng and Mithat Gonen kindly provided statistical advice for this manuscript. Both authors have significant statistical expertise. Institutional review board approval was obtained. Written informed consent was waived by the institutional review board. We thank the research team of Dr. Regina Beets-Tan for patient T1-value data provided.
Methodology: retrospective, observational, performed at one institution.
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Marc J. Gollub and Tong Tong contributed equally to this work.
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Gollub, M.J., Tong, T., Weiser, M. et al. Limited accuracy of DCE-MRI in identification of pathological complete responders after chemoradiotherapy treatment for rectal cancer. Eur Radiol 27, 1605–1612 (2017). https://doi.org/10.1007/s00330-016-4493-1
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DOI: https://doi.org/10.1007/s00330-016-4493-1