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European Radiology
Published in: European Radiology 4/2018

Open Access 01-04-2018 | Breast

Characterisation of fibrosis in chemically-induced rat mammary carcinomas using multi-modal endogenous contrast MRI on a 1.5T clinical platform

Authors: Neil P. Jerome, Jessica K. R. Boult, Matthew R. Orton, James A. d’Arcy, Ashutosh Nerurkar, Martin O. Leach, Dow-Mu Koh, David J. Collins, Simon P. Robinson

Published in: European Radiology | Issue 4/2018

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Abstract

Objectives

To determine the ability of multi-parametric, endogenous contrast MRI to detect and quantify fibrosis in a chemically-induced rat model of mammary carcinoma.

Methods

Female Sprague-Dawley rats (n=18) were administered with N-methyl-N-nitrosourea; resulting mammary carcinomas underwent nine-b-value diffusion-weighted (DWI), ultrashort-echo (UTE) and magnetisation transfer (MT) magnetic resonance imaging (MRI) on a clinical 1.5T platform, and associated quantitative MR parameters were calculated. Excised tumours were histologically assessed for degree of necrosis, collagen, hypoxia and microvessel density. Significance level adjusted for multiple comparisons was p=0.0125.

Results

Significant correlations were found between MT parameters and degree of picrosirius red staining (r > 0.85, p < 0.0002 for ka and δ, r < -0.75, p < 0.001 for T1 and T1s, Pearson), indicating that MT is sensitive to collagen content in mammary carcinoma. Picrosirius red also correlated with the DWI parameter fD* (r=0.801, p=0.0004) and conventional gradient-echo T2* (r=-0.660, p=0.0055). Percentage necrosis correlated moderately with ultrashort/conventional-echo signal ratio (r=0.620, p=0.0105). Pimonidazole adduct (hypoxia) and CD31 (microvessel density) staining did not correlate with any MR parameter assessed.

Conclusions

Magnetisation transfer MRI successfully detects collagen content in mammary carcinoma, supporting inclusion of MT imaging to identify fibrosis, a prognostic marker, in clinical breast MRI examinations.

Key Points

• Magnetisation transfer imaging is sensitive to collagen content in mammary carcinoma.
• Magnetisation transfer imaging to detect fibrosis in mammary carcinoma fibrosis is feasible.
• IVIM diffusion does not correlate with microvessel density in preclinical mammary carcinoma.
Appendix
Available only for authorised users
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Metadata
Title
Characterisation of fibrosis in chemically-induced rat mammary carcinomas using multi-modal endogenous contrast MRI on a 1.5T clinical platform
Authors
Neil P. Jerome
Jessica K. R. Boult
Matthew R. Orton
James A. d’Arcy
Ashutosh Nerurkar
Martin O. Leach
Dow-Mu Koh
David J. Collins
Simon P. Robinson
Publication date
01-04-2018
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 4/2018
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-017-5083-6

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