PIK3CA and attention deficit-hyperactivity disorder: The most promising pathways for LMQXM treatment of ADHD, according to GO and KEGG pathway enrichment analysis, are serotonergic synapse, neuroactive ligand-receptor interaction, the PI3K-Akt signaling pathway, the calcium signaling pathway, dopaminergic synapse, the cAMP signaling pathway, Alzheimer disease, the MAPK signaling pathway, and so on.