Abstract
Purpose
Chemotherapy increases survival in breast cancer patients. Consequently, cerebral metastases have recently become a significant clinical problem, with an incidence of 30–40% among breast carcinoma patients. As this phenomenon cannot be studied longitudinally in humans, models which mimic brain metastasis are needed to investigate its pathogenesis. Such models may later be used in experimental therapeutic approaches.
Material and methods/results
We report a model in which 69% of the animals (9/13 BALB/c nude mice) developed MR-detectable abnormal masses in the brain parenchyma within a 20 to 62-day time window post intra-carotid injection of 435-Br1 human cells. The masses detected in vivo were either single (7 animals) or multiple (2 animals). Longitudinal MR (MRI/MRS) studies and post-mortem histological data were correlated, revealing a total incidence of experimental brain metastases of 85% in the cases studied (11/13 animals). ADC maps perfectly differentiated edema and/or CSF areas from metastasis. Preliminary MRS data also revealed additional features: decrease in N-acetyl aspartate (NAA) was the first MRS-based marker of metastasis growth in the brain (micrometastasis); choline-containing compounds (Cho) rose and creatine (Cr) levels decreased as these lesions evolved, with mobile lipids and lactate also becoming visible. Furthermore, MRS pattern recognition-based analysis suggested that this approach may help to discriminate different growth stages.
Conclusions
This study paves the way for further in vivo studies oriented towards detection of different tumor progression states and for improving treatment efficiency.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- ASCII:
-
American Standard Code for Information Interchange
- CBF:
-
Cerebral blood flow
- CBV:
-
Cerebral blood volume
- CE-T1 MRI:
-
Contrast-enhanced T1 MRI
- DAB:
-
Diaminobenzidine
- DMEM/F12:
-
Dulbecco’s Modified Eagle Medium with nutrient mixture F12 Ham
- d_PI:
-
Days post-injection
- DWI:
-
Diffusion weighted imaging
- FBS:
-
Fetal bovine serum
- FOV:
-
Field of view
- GFP:
-
Green fluorescent protein
- GUI:
-
Graphical user interface
- H&E:
-
Hematoxylin–eosin
- IHC:
-
Immunohistochemistry
- ic :
-
Intracarotid
- ip :
-
Intraperitoneal
- LB:
-
Line broadening
- HBSS:
-
Hanks’ balanced salt solution
- 1H MRS:
-
Proton magnetic resonance spectroscopy
- ML:
-
Mobile lipids
- MRI:
-
magnetic resonance imaging
- MTX:
-
Matrix size
- MSME:
-
multi-slice multi-echo
- NEX:
-
Number of averages
- OCT:
-
Tissue freezing medium
- PCNA:
-
Proliferating cell nuclear antigen
- PRESS:
-
Point resolved spectroscopy
- RARE:
-
Rapid acquisition by relaxation enhancement
- sc :
-
Subcutaneous
- SNR:
-
Signal to noise ratio
- SPF:
-
Specific pathogen free
- TAT:
-
Total acquisition time
- TE:
-
Echo time
- TR:
-
Repetition time
- VAPOR:
-
Variable pulse power and optimized relaxation delays
- Δν 1/2 :
-
MRS peak width at half height
- Δ:
-
Big delta
- δ :
-
Small delta
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Simões, R.V., Martinez-Aranda, A., Martín, B. et al. Preliminary characterization of an experimental breast cancer cells brain metastasis mouse model by MRI/MRS. Magn Reson Mater Phy 21, 237–249 (2008). https://doi.org/10.1007/s10334-008-0114-6
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DOI: https://doi.org/10.1007/s10334-008-0114-6