As shown in Figure 2A, the mean concentration of serum PSA levels in normal controls was 4.64 ± 0.86 ng/mL (n = 25), whereas that in prostate cancer patients was 12.95 ± 1.84 ng/mL (n = 32, p-value = 0.0002). The gene discussed is KLK3; the disease is Familial prostate cancer.