Different Clusterin levels have been reported for AD patients; 67 AD cases were studied with mean age 85.3 ± 3.2 and Clusterin plasma levels of 158.5 ± 45.3 μg/mL (Schürmann et al., 2011), 60 AD cases were studied with mean age 83.4 ± 7.3 with Clusterin plasma levels of 129 ± 29 μg/mL (Schrijvers et al., 2011), also 17 AD cases with mean age 86.0 ± 6.36 and Clusterin plasma levels of 106.3 ± 23.7 μg/mL (Thambisetty et al., 2012). The gene discussed is CLU; the disease is Alzheimer disease.