KLK3 and cancer: Tumour markers were within the normal range: alpha- fetoprotein (AFP) (1.46 μg/L; normal range <13.4), carcinoembryonic antigen (CEA) (1.79 μg/L; normal range < 3.4), cancer antigen 19/9 (CA19-9) (16.93 kIU/L; normal range < 37), prostate-specific antigen (PSA) (1.44 μg/L, normal range < 4).