At present, a variety of treatments are available for AD, such as granulocyte colony‐stimulating factor and CXCR4 antagonist, mobilization of hematopoietic stem cells to peripheral blood, β secretase inhibitors and other drugs to reduce Aβ load, neurotrophic factors, and immunotherapy, but so far, there is no effective treatment for AD.5 The gene discussed is CXCR4; the disease is Alzheimer disease.