Abstract
Objectives
To evaluate the MRI macroscopic and microscopic parameters of mesorectal vasculature in rectal cancer patients.
Methods
Thirteen patients with rectal adenocarcinoma underwent a dynamic contrast-enhanced MRI at 1.5 T using a blood pool agent at the primary staging. Mesorectal macrovascular features, i.e., the number of vascular branches, average diameter and length, were assessed from baseline-subtracted post-contrast images by two independent readers. Mesorectal microvascular function was investigated by means of area under the enhancement-time curve (AUC). Histopathology served as reference standard of the tumour response to CRT.
Results
The average vessel branching in the mesorectum around the tumour and normal rectal wall was 8.2 ± 3.8 and 1.7 ± 1.3, respectively (reader1: p = 0.001, reader2: p = 0.002). Similarly, the tumour-surrounding mesorectum displayed circa tenfold elevated AUC (p = 0.01). Interestingly, patients with primary node involvement had a twofold higher number of macrovascular branches compared to those with healthy nodes (reader1: p = 0.005 and reader2: p = 0.03). A similar difference was observed between good and poor responders to CRT, whose tumour-surrounding mesorectum displayed 10.7 ± 3.4 and 5.6 ± 1.5 vessels, respectively (reader1/reader2: p = 0.02).
Conclusions
We showed at baseline MRI of rectal tumours a significantly enhanced macrovascular structure and microvascular function in rectal tumour-surrounding mesorectum, and the association of primary mesorectal macrovascular parameters with node involvement and therapy response.
Key Points
• Vascular MRI reveals macrovascular and microvascular abnormalities in the rectal tumour-surrounding mesorectum.
• Formation of highly vascular stroma precedes the actual tumour invasion.
• High macrovascular parameters are associated with node involvement.
• Mesorectal vascular network differs for good and poor responders.
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Abbreviations
- a.u.:
-
Arbitrary units
- AUC:
-
Area under the contrast enhancement-time curve
- cN:
-
Clinical (MRI-based) nodal stage
- CRT:
-
Neoadjuvant chemoradiotherapy
- DCE-MRI:
-
Dynamic contrast-enhanced magnetic resonance imaging
- EMVI:
-
Extramural venous invasion
- H&E:
-
Haematoxylin and eosin staining
- ROI:
-
Region of interest
- SI:
-
Signal intensity
- T1:
-
Longitudinal relaxation time
- T2:
-
Transversal relaxation time
- TME:
-
Total mesorectal excision
- TRG:
-
Tumour regression grade
- (y)pTN:
-
Pathological tumour and node stage
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Acknowledgments
The scientific guarantor of this publication is Regina G.H. Beets-Tan, PhD, 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. The authors state that this work has not received any funding.
No complex statistical methods were necessary for this paper. Institutional Review Board approval was obtained. Written informed consent was obtained from all subjects (patients) in this study.
Methodology: prospective, experimental, performed at one institution.
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Jean-Paul J. E. Kleijnen and Milou H. Martens contributed equally to this work.
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Kluza, E., Kleijnen, JP.J.E., Martens, M.H. et al. Non-invasive MR assessment of macroscopic and microscopic vascular abnormalities in the rectal tumour-surrounding mesorectum. Eur Radiol 26, 1311–1319 (2016). https://doi.org/10.1007/s00330-015-3955-1
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DOI: https://doi.org/10.1007/s00330-015-3955-1