Using a KEGG analysis, we further explored proteoglycans related to cancer (MAPK14, DDX5, STAT3, EGFR, PXN, GRB2, CBL) and various pathways, including mitogen‐activated protein kinase (MAPK) signalling (MAPK14, DUSP3, EGFR, GRB2), FoxO signalling (MAPK14, STAT3, EGFR, GRB2) and phosphatidylinositol‐4,5‐bisphosphate 3‐kinase (PI3K)‐Akt signalling (CDK4, EGFR, GRB2, LAMA5). Here, STAT3 is linked to cancer.