11.   The recommendation does not include men with moderate or high levels of PSA, or prostate specific antigen, an antibody the body produces to combat cancer.

12.   When they analyzed the results, researchers found that men with higher stress levels were three times as likely to have high levels of prostate specific antigen.

13.   The blockers are sometimes used before surgery or radiation to shrink the prostate and reduce prostate specific antigen, or PSA, levels.