Analysis of the 122 samples studied by Grasso et al. [23] identified PIK3R1 as −1.428 fold under-expressed in prostate carcinoma relative to normal prostate tissue (p=4.99E-5) and placed PIK3R1 in the top 10% of under-expressed genes (Figure 5A). The gene discussed is PIK3R1; the disease is prostate carcinoma.