BDNF and asthma: In addition, based on the analysis of KEGG signaling pathway data, we believed that the key signaling pathways such as neurotrophin signaling pathway, estrogen signaling pathway, PI3K-Akt signaling pathway, and ErbB signaling pathway, the top 4 KEGG pathways in these clusters, might be the core pharmacological mechanism of MXGSD for asthma.