The questions that participants were least knowledgeable about (scored less than 60%) were: (1) I should be able to tell immediately if I have prostate problem; (2) Having somebody in your family with prostate cancer increases the chance of getting prostate cancer; (3) A diet high in fat will decrease the chance of getting prostate cancer; (4) Doing only one of the tests, prostate-specific antigen (PSA) or the digital rectal exam (DRE), is enough to test for prostate cancer; and (5) Early screening for prostate cancer cannot tell if one has prostate cancer. Here, KLK3 is linked to prostate cancer.