Fig. 7From: Genomic landscape of the immune microenvironments of brain metastases in breast cancera The constructed protein–protein interaction (PPI) network of differentially expressed genes (DEGs) associated with macrophages M2. The triangle nodes represent upregulated DEGs; the red node represents DEGs associated with macrophages M2. b The thickness of the line is positively correlated to the relationship score obtained by STRINGBack to article page