The self-administered questionnaire included questions on: socio-demographic characteristics, personal and familiar medical history of prostate cancer, knowledge about prostate cancer and the prostate-specific antigen (PSA) test, perception of risk towards prostate cancer, perception of the benefits of having a PSA-test, willingness to receive the PSA-test and sources of and needs of information regarding prostate cancer and the PSA-test. This evidence concerns the gene KLK3 and prostate cancer.