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• W4366750957 abstract "From a systems biology perspective, genes usually work collaboratively in the form of a network, e.g., cancer-related genes participate in an integrative dysfunctional pathway. Thus, feature gene selection considering the graph or network structure plays a crucial role in cancer biomarker discovery from high-throughput omics data. The network-based paradigm demonstrates that integrating gene expression data with gene networks can improve classification performances and generate more interpretable feature subsets. In this paper, we propose an embedded connected network-constrained support vector machine (CNet-SVM) method to keep the selected features in an inherent graph structure in discovering biomarker genes. Firstly, we mathematically formulate the CNet-SVM model as a convex optimization problem constrained by network connectivity inequalities and theoretically investigate the behaviors of all tuning parameters to provide search guidance on the regularization path. Secondly, to check if the genes selected by CNet-SVM could be studied as network-structured biomarkers, we conduct experiments on several simulation datasets and real-world breast cancer (BRCA) datasets to validate its classification and prediction capabilities. The results show that CNet-SVM not only maintains the sparsity and smoothness, but also considers the connectivity constraints between genes when selecting features on a prior gene–gene interaction network from omics data. Especially, CNet-SVM identifies 32 BRCA biomarker genes, which form into a connected network component and can be potentially used for BRCA diagnosis. Furthermore, the comparisons with eight feature selection-empowered SVM methods demonstrate that the easily interpretable networked feature genes discovered by CNet-SVM are more closely related to BRCA dysfunctions. Finally, we validate that the identified biomarkers achieve high prediction accuracy on external independent cohorts. All results proved that the proposed CNet-SVM method is effective in selecting connected-network-structured features and can be an alternative improvement to the current SVM models for biomarker identification from high-throughput data. The data and code are available at https://github.com/zpliulab/CNet-SVM." @default.
• W4366750957 created "2023-04-24" @default.
• W4366750957 creator A5001552700 @default.
• W4366750957 creator A5060349602 @default.
• W4366750957 date "2023-09-01" @default.
• W4366750957 modified "2023-10-04" @default.
• W4366750957 title "Biomarker discovery from high-throughput data by connected network-constrained support vector machine" @default.
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• W4366750957 doi "https://doi.org/10.1016/j.eswa.2023.120179" @default.
• W4366750957 hasPublicationYear "2023" @default.
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