At present it is not possible to say with certainty what the incidence of prostate cancer is in Ireland each year. This information will be available from 1994 from the new national cancer register. The main objective of systematic screening is the prevention or the early diagnosis of certain conditions with a view to curing or stabilising the condition. In general, screening programmes involve the carrying out of specific diagnostic procedures on apparently well individuals, on a mass population basis, to detect those with previously undiagnosed disease.