1. From the Urologic Oncology Branch, National Cancer Institute, National Heart, Lung, and Blood Institute, Diagnostic Radiology and Nuclear Medicine Department, Warren G. Magnuson Clinical Center, Biostatistics and Data Management Sections, Cancer Diagnosis Branch, Division of Cancer Treatment, Diagnosis and Centers, National Cancer Institute, National Institutes of Health, Bethesda and Laboratory of Immunobiology, National Cancer Institute, Frederick, Maryland