KLK3 and benign prostatic hyperplasia: The mean values (±SD) for serum PSA in the individual groups were as follows: 8.8 ± 4.8 ng/mL for the BPH, 9.7 ± 8.2 ng/mL for the GS6, 15.8 ± 13.6 ng/mL for the GS7, 28.9 ± 24.6 ng/mL for the GS8, and 80.1 ± 72.2 ng/mL for the GS9 group (Table 1).