Screening for prostate cancer. Does it make a difference?

Susan's father, Sidney Smith, is 63 years old. Recently he has heard on radio and television talk shows that a new test, the Prostate Specific Antigen (PSA), is now available to check for prostate cancer. During his general check-up visit to your office, he mentions this test and wants to know more. He is in excellent health and his urinary review of systems reveals only a slight decrease in the intensity of his urinary stream. On examination he has moderate prostate enlargement but no palpable nodules. His stool test is Hemoccult negative. The remainder of his examination is normal.