4.1. The Median Concentration of CXCL-9, CXCL-10, CXCL-11, CXCL-12, CCL-17, CCL-20, CCL-21, CCL-22, CCL-27, IL-18 in AD Patients below 10 Years Old (Group 1). This evidence concerns the gene CXCL12 and Alzheimer disease.