PPFIA4 and colorectal carcinoma: Consequently, the PPI network was generated in the STRING protein interaction database to show the interaction among the 100 genes (Supplementary Figure 1), and then the 100 genes were imported into the Cytoscape platform (Version 3.7.1) to clarify the mutual relations of the 100 top genes co-expressed with PPFIA4 in CRC (Supplementary Figure 2).