In biological processes, it is mainly involved in regulating cellular processes, stress response processes, biological metabolic process, etc KEGG signalling pathway enrichment analysis results suggest that these differentially expressed proteins are mainly involved in the following signalling pathways: pathways in cancer, endocytosis pathways, axon guidance pathways, Ras signalling pathways, neurotrophin signalling pathways and PI3K‐Akt signalling pathways. The gene discussed is BDNF; the disease is cancer.