Published in:
01-07-2011 | Breast
Vascular characterisation of triple negative breast carcinomas using dynamic MRI
Authors:
Sonia P. Li, Anwar R. Padhani, N. Jane Taylor, Mark J. Beresford, Mei-Lin W. Ah-See, J. James Stirling, James A. d’Arcy, David J. Collins, Andreas Makris
Published in:
European Radiology
|
Issue 7/2011
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Abstract
Objectives
Triple-negative (ER-/PR-/HER2-) breast carcinomas (TNBC) are aggressive tumours with underexplored imaging features. This study investigates whether their vascular characteristics as assessed by dynamic contrast-enhanced (DCE) and dynamic susceptibility contrast-enhanced (DSC) MRI are distinct from the prognostically more favourable ER+/PR+/HER2- cancers.
Methods
Patients with primary breast cancer underwent MRI before neoadjuvant chemotherapy and were identified as ER-/PR-/HER2- or ER+/PR+/HER2- from core biopsy specimens. MRI parameters reflecting tissue perfusion, permeability, and extracellular leakage space were measured. Values for inflow transfer constant (Ktrans), outflow rate constant (kep), leakage space (ve), area under the gadolinium curve (IAUGC60 ), relative blood volume (rBV) and flow (rBF), and Mean Transit Time (MTT) were compared across receptor status and with known prognostic variables.
Results
Thirty seven patients were assessable in total (16 ER-/PR-/HER2-, 21 ER+/PR+/HER2-). Lower ve (p = 0.001), shorter MTT (p = 0.007) and higher kep values (p = 0.044) were observed in TNBC. ve was lower across all T stages, node-negative (p = 0.004) and low-grade TNBC (p = 0.037). ve was the best predictor of triple negativity (ROC AUC 0.80).
Conclusions
TNBC possess characteristic features on imaging, with lower extracellular space (higher cell density) and higher contrast agent wash-out rate (higher vascular permeability) suggesting a distinctive phenotype detectable by MRI.