Abstract
Although magnetic resonance imaging (MRI) data of patients with multiple myeloma (MM) are used to predict prognosis, few reports have applied artificial intelligence (AI) techniques for this purpose. We aimed to analyze whole-body diffusion-weighted MRI data using three-dimensional (3D) convolutional neural networks (CNNs) and Gradient-weighted Class Activation Mapping (Grad-CAM), an explainable AI, to predict prognosis and explore the factors involved in prediction. We retrospectively analyzed the MRI data of a total of 142 patients with MM obtained from two medical centers. We defined the occurrence of progressive disease after MRI evaluation within 12 months as a poor prognosis and constructed a 3D CNN-based deep learning model to predict prognosis. Images from 111 cases were used as the training and internal validation data; images from 31 cases were used as the external validation data. Internal validation of the AI model with stratified 5-fold cross-validation resulted in a significant difference in progression-free survival (PFS) between good and poor prognostic cases (2-year PFS, 91.2% versus [vs.] 61.1%, P = 0.0002). The AI model clearly stratified good and poor prognostic cases in the external validation cohort (2-year PFS, 92.9% vs. 55.6%, P = 0.004), with an area under the receiver operating characteristic curve of 0.804. According to Grad-CAM, the MRI signals of the spleen and bones of the vertebrae and pelvis contributed to prognosis prediction. This study is the first to show that image analysis of whole-body MRI using a 3D CNN without any other clinical data is effective in predicting the prognosis of patients with MM.
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The training and validation datasets analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
This study was supported by the research fundings from the Mitani Foundation for Research and Development and the Japanese Society of Hematology Research Grant. The authors thank all physicians and staff members of the collaborating institutes and also Editage for a Language Editing Service.
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Contributions: S.K., H.N. and H.T. designed the study; K.M. S.K., K.Y., H.N. and H.T. analyzed data and wrote the manuscript; T.T., T. Yamashita, T. Yoroidaka., M.T., T.I., Y.Z., A.Y., H.M., N.I., G.A., T.K., R.M., T.M. Y.M. and K.M. provided the patients data; and all authors interpreted the data and reviewed and approved the final manuscript.
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H.T. received consulting fee from SRL, honoraria from Janssen Co. Ltd., Ono Pharmaceutical Co., Sanofi Pharmaceutical Co. and Bristol-Myers Squibb and research fund from Bristol-Myers Squibb. T.M. received honoraria from Takeda Pharmaceutical Co., Otsuka Pharmaceutical Co., Astellas Pharmaceutical Co., Janssen Co. Ltd., AbbVie Pharmaceutical Co. Ltd., and Sanofi Pharmaceutical Co. The remaining authors declare no competing interest.
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Morita, K., Karashima, S., Terao, T. et al. 3D CNN-based Deep Learning Model-based Explanatory Prognostication in Patients with Multiple Myeloma using Whole-body MRI. J Med Syst 48, 30 (2024). https://doi.org/10.1007/s10916-024-02040-8
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DOI: https://doi.org/10.1007/s10916-024-02040-8