Patients with a prior diagnosis of prostate cancer will be evaluated in the GMB Clinic, NCI. Blood samples may be collected at the initial visit or at follow-up visits. Genomic DNA and white blood cells will each be extracted from these samples to be utilized for genotyping and establishment of individual cell lines. Genetic variance will be correlated with prostate cancer prognosis (i.e. time from diagnosis to death) and prognostic indicators (i.e. histological tumor grade). Healthy controls will not be compared and no correlations will be made with prostate cancer susceptibility.