Abstract
Purpose
To build and validate a magnetic resonance imaging-based radiomics model to preoperatively evaluate tumor budding (TB) in locally advanced rectal cancer (LARC).
Methods
Pathologically confirmed LARC cases submitted to preoperative rectal MRI in two distinct hospitals were enrolled in this retrospective study and assigned to cohort 1 (training set, n = 77; test set, n = 51) and cohort 2 (validation set, n = 96). Radiomics features were obtained from multiple sequences, comprising high-resolution T2, contrast-enhanced T1, and diffusion-weighted imaging (T2WI, CE-T1WI, and DWI, respectively). The least absolute shrinkage and selection operator (LASSO) was utilized to select the optimal features from T2WI, CE-T1WI, DWI, and the combination of multi-sequences, respectively. A support vector machine (SVM) classifier was utilized to construct various radiomics models for discriminating the TB grades. Receiver operating characteristic curve analysis and decision curve analysis (DCA) were carried out to determine the diagnostic value.
Results
Five optimal features associated with TB grade were determined from combined multi-sequence data. Accordingly, a radiomics model based on combined multi-sequences had an area under the curve of 0.796, with an accuracy of 81.2% in the validation set, showing a better performance in comparison with other models in both cohorts (p < 0.05). DCA exhibited a clinical benefit for this radiomics model.
Conclusion
The novel MRI-based radiomics model combining multiple sequences is an effective and non-invasive approach for evaluating TB grade preoperatively in patients with LARC.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Code availability
Not applicable.
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Acknowledgements
We thank our funders for coming up with the main ideas and designing the studies.
Funding
The present study was supported by the Project of the Action Plan of Major Diseases Prevention and Treatment (2017ZX01001-S12) and the Special Project of Integrated Traditional Chinese and Western Medicine in General Hospitals of Shanghai (ZHYY-ZXYJHZX-201901). They provide the main ideas and design the studies.
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ZL performed segmentation and is a major contributor in writing the manuscript. FC performed segmentation and analyzed and interpreted the patient data regarding radiomics features. SZ analyzed and interpreted the patient data regarding radiomics features. XM acquired the data. YX performed statistical analysis. FS conceived the project. YL conceived the project. CS conceived the project. All authors read and approved the final manuscript.
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The present study was approved by the Biomedicine Ethics Review Committees of Ruijin Hospital and Changhai Hospital.
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261_2021_3311_MOESM1_ESM.docx
Supplementary file1—Supplemental Table 1. Detailed parameters applied for T2WI, T1WI, and DWI and used for radiomics model building. (DOCX 18 kb)
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Li, Z., Chen, F., Zhang, S. et al. The feasibility of MRI-based radiomics model in presurgical evaluation of tumor budding in locally advanced rectal cancer. Abdom Radiol 47, 56–65 (2022). https://doi.org/10.1007/s00261-021-03311-5
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DOI: https://doi.org/10.1007/s00261-021-03311-5