Thanks to a blood test called prostate specific antigen, or PSA, the quest to discover prostate cancer early is made easier. As a result of early detection, over eighty percent of patients with prostate cancer can be cured. Researchers now believe that prostate cancer cells grow in part due to a failure of the body's immune system to recognize and react to these cells. However, there are new ways to help the immune system recognize prostate cancer cells, and hopefully destroy them.