KLK3 and Familial prostate cancer: A total of 28 prostate cancer patients with a mean age of 67.3 ± 7.4 years and a mean serum PSA value of 25.49 ± 32.7 ng/mL (median: 9.39 ng/mL, range: 0.5–125.1 ng/mL) were included in our study.