Abstract
To explore radiomic features of pharmacokinetic dynamic contrast-enhanced (Pk-DCE) MRI on the extensive Tofts model to diagnose breast cancer and predict molecular phenotype. Breast lesions enrolled must undergo Pk-DCE MRI before treatment or puncture, and be identified as primary lesions by pathology. Ktrans, Kep, Ve and Vp were generated on the extensive Tofts model. Radiomic features (histogram, geometry and texture features) were extracted from parametric maps and selected by LASSO. The subjects were divided into training and validation cohort with a ratio of 4:1 to construct model in diagnosis of breast cancer. Feature analysis was made to predict the molecular phenotype. Area under curve (AUC), sensitivity, specificity and accuracy were used to evaluate radiomic features. DeLong’s test was performed to compare AUC values. 228 breast lesions met the criteria were used to discrimination and 126 malignant lesions were used to study molecular phenotypes. The number of training cohort and validation cohort were 182 and 46, respectively. The AUC of Ktrans, Kep, Ve, and Vp was 0.95, 0.93, 0.89, and 0.96, and their accuracy was 85%, 89%, 89%, 94% respectively in diagnosis of breast lesions, while their AUC was 0.71 to 0.77, 0.61 to 0.68, and 0.67 to 0.74 to predict ER/PR, Her-2, and Ki-67. There was no significant difference among parameters (P > 0.05). Radiomic features based on Pk-DCE MRI have an advantage to diagnose breast cancer and less ability to predict molecular phenotypes, which are beneficial to guide clinical treatment of breast lesions in some extent.
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Abbreviations
- Pk-DCE MRI:
-
Pharmacokinetic dynamic contrast-enhanced magnetic resonance imaging
- HR:
-
Hormone receptor
- ER:
-
Estrogen receptor
- PR:
-
Progesterone receptor
- Her-2:
-
Human epidermal growth factor receptor 2
- ROC curve:
-
Receiver operating characteristic curve
- OR:
-
Odds ratio
- AUC:
-
Area under the curve
- ROI:
-
Region of interest
- VIF:
-
Variance inflation factor
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Acknowledgements
This study was supported by the grant from Natural Science Foundation of Jiangsu Province (Grant No. BK20170626 to G. F.) and Jiangsu Provincial Natural Science Foundation (Grant No. 19KJB520025 to Xiaoyu Zhou). All authors thank Mr. Zhoushe Zhao, a scientist at GE Healthcare.
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Zhou, X., Gao, F., Duan, S. et al. Radiomic features of Pk-DCE MRI parameters based on the extensive Tofts model in application of breast cancer. Phys Eng Sci Med 43, 517–524 (2020). https://doi.org/10.1007/s13246-020-00852-9
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DOI: https://doi.org/10.1007/s13246-020-00852-9