Abstract
Objectives
This study aims to evaluate the feasibility of imaging breast cancer with glucosamine (GlcN) chemical exchange saturation transfer (CEST) MRI technique to distinguish between tumor and surrounding tissue, compared to the conventional MRI method.
Methods
Twelve patients with newly diagnosed breast tumors (median age, 53 years) were recruited in this prospective IRB-approved study, between August 2019 and March 2020. Informed consent was obtained from all patients. All MRI measurements were performed on a 3-T clinical MRI scanner. For CEST imaging, a fat-suppressed 3D RF-spoiled gradient echo sequence with saturation pulse train was applied. CEST signals were quantified in the tumor and in the surrounding tissue based on magnetization transfer ratio asymmetry (MTRasym) and a multi-Gaussian fitting.
Results
GlcN CEST MRI revealed higher signal intensities in the tumor tissue compared to the surrounding breast tissue (MTRasym effect of 8.12 ± 4.09%, N = 12, p = 2.2 E−03) with the incremental increase due to GlcN uptake of 3.41 ± 0.79% (N = 12, p = 2.2 E−03), which is in line with tumor location as demonstrated by T1W and T2W MRI. GlcN CEST spectra comprise distinct peaks corresponding to proton exchange between free water and hydroxyl and amide/amine groups, and relayed nuclear Overhauser enhancement (NOE) from aliphatic groups, all yielded larger CEST integrals in the tumor tissue after GlcN uptake by an averaged factor of 2.2 ± 1.2 (p = 3.38 E−03), 1.4 ± 0.4 (p =9.88 E−03), and 1.6 ± 0.6 (p = 2.09 E−02), respectively.
Conclusion
The results of this initial feasibility study indicate the potential of GlcN CEST MRI to diagnose breast cancer in a clinical setup.
Key Points
• GlcN CEST MRI method is demonstrated for its the ability to differentiate between breast tumor lesions and the surrounding tissue, based on the differential accumulation of the GlcN in the tumors.
• GlcN CEST imaging may be used to identify metabolic active malignant breast tumors without using a Gd contrast agent.
• The GlcN CEST MRI method may be considered for use in a clinical setup for breast cancer detection and should be tested as a complementary method to conventional clinical MRI methods.
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Abbreviations
- CEST:
-
Chemical exchange saturation transfer
- Gd:
-
Gadolinium
- GlcN:
-
Glucosamine
- MRI:
-
Magnetic resonance imaging
- MT:
-
Magnetization transfer
- MTRasym:
-
Magnetization transfer ratio asymmetry
- NOE:
-
Nuclear Overhauser enhancement
- ROI:
-
Region of interest
- T1W:
-
T1-weighted
- T2W:
-
T2-weighted
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Acknowledgements
We are indebted to the patients who participated in this research and we gratefully acknowledge Dr. Ilana Haas and Dr. Ravit Agassi for assisting in their recruitment.
Funding
The authors gratefully acknowledge the support of this research by the Earlier.org - Friends For an Earlier Breast Cancer Test foundation and the Israel Science Foundation.
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Institutional Review Board approval was obtained.
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Written informed consent was obtained from all subjects (patients) in this study.
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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.
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The scientific guarantor of this publication is Prof. Gil Navon.
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• diagnostic or prognostic study
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Rivlin, M., Anaby, D., Nissan, N. et al. Breast cancer imaging with glucosamine CEST (chemical exchange saturation transfer) MRI: first human experience. Eur Radiol 32, 7365–7373 (2022). https://doi.org/10.1007/s00330-022-08772-w
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DOI: https://doi.org/10.1007/s00330-022-08772-w