A 64-year-old Swiss Caucasian man patient with weak urinary flow and an elevated serum prostate-specific antigen (PSA) level of 130 μg/L was diagnosed with adenocarcinoma of the prostate on the basis of a biopsy (Gleason grade G3, Gleason score 4 + 4 = 8). Here, KLK3 is linked to prostate adenocarcinoma.