KLK3 and prostate cancer: The observed lower risk of prostate cancer mortality among foreign-born men, which was also found in immigrants in other parts of the world [6], [8], [25], [39], [40], [46], [47], [48], might be due to a true lower incidence of prostate cancer [26], [49] or to undetected prostate cancer among foreign-born men as a result of a lack of awareness among this group of the prostate-specific antigen test.