The mean PSA (ng/mL) of men with suspected prostate cancer and diagnosed with (a)intermediate to high-grade prostate cancer was 6.2 (SD = 2.1); (b) low-gradeprostate cancer was 11.9 (SD = 12.6); and (c) no cancer was 10.0 (SD = 5.9). This evidence concerns the gene KLK3 and prostate cancer.