Prostate cancer is the second leading cancer in men in Western society. A major concern, and an area of intensive research, involves understanding why certain prostate cancers remain localized or indolent, whereas others become aggressive and metastasize. The differences between these cancer types have profound implications for patients and physicians. Indolent d- ease, which grows very slowly, generally does not cause any problems to the patient, whereas aggressive disease requires immediate treatment, the earlier the better. At present, there are no markers that discriminate between these...