Prostate-specific antigen kallikrein: from prostate cancer to cardiovascular system.

Prostate-specific antigen (PSA), considered only an established marker for the detection of prostate cancer, has been identified as a member (hK3) of the human kallikrein family of serine proteases and now, it is known that PSA is not specific to prostate, semen, and gender. Increased PSA serum levels have been reported also in cardiovascular patients and both elevated as well as diminished PSA have been reported during acute myocardial infarction (AMI). Preliminary observations have concluded that when elevation of prostate-specific antigen occurs during AMI, it seems to relate to a higher occurrence of major adverse cardiac events and that coronary lesions are frequent and often more severe than when a diminution of PSA occurs. Large studies need to be done to confirm these preliminary results but the journey of PSA could be longer than expected.