EGFR and cancer: What’s more, enrichment analysis in PD group showed that the proteins were enriched in multiple GO terms and KEGG pathways, including regulation of cell population proliferation, immune response, and cell-cell signaling, as well as a number of oncology and immunology-related pathways such as PI3K-Akt signaling pathway, MAPK signaling pathway, pathways in cancer, ErbB signaling pathway, focal adhesion, and natural killer cell mediated cytotoxicity (Figure 3B).