In AD, the Th2 type of immune response dominates and is characterized by the participation of the cytokines interleukin 4 (IL-4), interleukin 5 (IL-5), interleukin 13 (IL-13), interleukin 33 (IL-33), and thymic stromal lymphopoietin (TSLP) [15]. This evidence concerns the gene IL4 and Alzheimer disease.