KLK3 and prostate cancer: For patients with suspicious DRE findings, the corresponding detection rates of prostate cancer for the subgroups stratified according to PSA levels (less than 4.0, 4.0 to 10.0, 10.0 to 20.0, 20.0 to 100.0, and ≥ 100.0 ng/ml) were 33.3, 58.2, 59.6, 62.8, and 96.7%, respectively.