Abstract
Objectives
To investigate the impact of background parenchymal enhancement (BPE), amount of fibroglandular tissue (FGT) and menopausal status on apparent diffusion coefficient (ADC) values in differentiation between malignant and benign lesions.
Methods
In this HIPAA-compliant study, mean ADC values of 218 malignant and 130 benign lesions from 288 patients were retrospectively evaluated. The differences in mean ADC values between benign and malignant lesions were calculated within groups stratified by BPE level (high/low), amount of FGT (dense/non-dense) and menopausal status (premenopausal/postmenopausal). Sensitivities and specificities for distinguishing malignant from benign lesions within different groups were compared for statistical significance.
Results
The mean ADC value for malignant lesions was significantly lower compared to that for benign lesions (1.07±0.21 x 10−3 mm2/s vs. 1.53±0.26 x 10−3 mm2/s) (p<0.0001). Using the optimal cut-off point of 1.30 x 10−3 mm2/s, an area under the curve of 0.918 was obtained, with sensitivity and specificity both of 87 %. There was no statistically significant difference in sensitivities and specificities of ADC values between different groups stratified by BPE level, amount of FGT or menopausal status.
Conclusions
Differentiation between benign and malignant lesions on ADC values is not significantly affected by BPE level, amount of FGT or menopausal status.
Key Points
• ADC allows differentiation between benign and malignant lesions.
• ADC is useful for breast cancer diagnosis despite different patient characteristics.
• BPE, FGT or menopause do not significantly affect sensitivity and specificity.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- AUC:
-
Area under the curve
- BIRADS:
-
Breast Imaging Reporting and Data System
- BPE:
-
Background parenchymal enhancement
- DWI:
-
Diffusion-weighted imaging
- DCE:
-
Dynamic contrast-enhancement
- FGT:
-
Fibroglandular tissue
- MRI:
-
Magnetic resonance imaging
- ROC:
-
Receiving operator characteristic
- SD:
-
Standard deviation
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Acknowledgements
We would like to thank Joanne Chin for technical editing.
Funding
This study has received funding by Memorial Sloan Kettering Cancer Center Support Grant / NIH Core Grant (P30 CA008748), DOD BCRP W81XWH-09-1-0042 grant, and the Breast Cancer Research Foundation grant of Memorial Sloan Kettering Cancer Center.
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The scientific guarantor of this publication is Sunitha B. Thakur.
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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.
Statistics and biometry
One of the authors has significant statistical expertise (Sujata Patil).
Informed consent
Written informed consent was waived by the Institutional Review Board.
Ethical approval
Institutional Review Board approval was obtained.
Study subjects or cohorts overlap
Some study subjects or cohorts have been previously reported in Durando M, Gennaro L, Cho GY et al (2016) Quantitative apparent diffusion coefficient measurement obtained by 3.0Tesla MRI as a potential noninvasive marker of tumor aggressiveness in breast cancer. Eur J Radiol 85:1651-1658. However, different data were used in a different context.
Methodology
• retrospective
• observational
• performed at one institution
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Horvat, J.V., Durando, M., Milans, S. et al. Apparent diffusion coefficient mapping using diffusion-weighted MRI: impact of background parenchymal enhancement, amount of fibroglandular tissue and menopausal status on breast cancer diagnosis. Eur Radiol 28, 2516–2524 (2018). https://doi.org/10.1007/s00330-017-5202-4
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DOI: https://doi.org/10.1007/s00330-017-5202-4