Approaches resulting in reduced T cell activation using agents such as alefacept (fusion protein of lymphocyte function antigen (LFA)-3 (CD58) and immunoglobulin (Ig)G, rituximab (anti-CD20 antibody) and efalizumab (anti-CD11a antibody, no longer available) have been shown to be effective in selected patients with moderate to severe AD and were mentioned in guidelines [2,41-44]. The gene discussed is CD58; the disease is Alzheimer disease.