In this study we confirm that this AD thrombocytopenia was moderate (>50 x109/L) sometimes near the lower limit of normal range [7, 8, 20, 21] and that patients with complete RUNX1 deletion had a lower platelet count than those with RUNX1 mutation (Table 1) [19, 22]. The gene discussed is RUNX1; the disease is Alzheimer disease.