Routine blood tests were unremarkable; tumor marker tests showed: alpha fetoprotein 1.69 (‐), carcinoembryonic antigen (‐), CA19-9 (‐), CA72-4 (+), total prostate-specific antigen (‐), free prostate-specific antigen (‐), fP/tP% (‐). Here, KLK3 is linked to neoplasm.