BDNF and cancer: Enrichment analysis indicated that they are enriched in the neurotrophin signaling pathway (P = 7.27 × 10−13), ERBB signaling pathway (P = 1.84 × 10−7), long-term potentiation (P = 5.37 × 10−5), MAPK signaling pathway (P = 3.16 × 10−5), T cell receptor signaling pathway (P = 1.17 × 10−5), and pathways in cancer (P = 4.87 × 10−8) to name a few (Supplementary Table S6).