PRL and early-onset autosomal dominant Alzheimer disease: The enrichment analysis results of the KEGG pathway mainly involved neuroactive ligand-receptor interaction, serotonergic synapse, dopaminergic synapse, cAMP signaling pathways, calcium signaling pathways, Alzheimer’s disease, lipid and atherosclerosis, prolactin signaling pathways, Gap junction, morphine addiction, Parkinson’s disease and other pathways.