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The identification of key genes in key modules. PPI network of the genes in brown (a), blue (b), and red (c) modules. d Volcano plot visualizing DEGs between metastasis and non-metastasis OS samples. e Identification of common genes between DEGs and the key modules by overlapping them. Receiver operating characteristic curve of support vector machine classification and showed the diagnostic efficiency of genes in brown (f) and red (g) module. AUC, area under the curve
