The use of prostate specific antigen (PSA) test could have a large impact o
n the incidence of prostate cancer in the UK. Over a period of 1 year (1999
), 3.5% out of 160 015 men aged > 45 on a GP database, who had no previous
record of prostate cancer, had a PSA test. Of the tested men, 21.3% had a P
SA > 4 ng/ml. Future data need to distinguish between men with and without
symptoms. (C) 2001 Cancer Research Campaign.