The cancer was detected recently in its early stages, he said. His doctors had monitored his health for about
2½ years after a routine test came came back with unusual results. The test was a Prostate-Specific Antigen (PSA) test to measure antigen, substances that stimulate an immune response in the body.
He also had biopsies to test for cancer. The fourth and most recent biopsy found a "very, very small isolated pocket of cancer," Howard said.
http://www.cnn.com/2009/HEALTH/02/18/clark.howard/