The mean patient age was 67.2 ± 5.5 years (range: 41–78 years), and the mean prostate-specific antigen (PSA) concentration, at diagnosis of prostate cancer, was 9.16 ± 6.50 ng/mL (range: 2.20–55.31 ng/mL). This evidence concerns the gene KLK3 and prostate cancer.