1. From the Laboratories of Immunobiology and Pathology, Surgery Branch and Cancer Diagnosis Branch, National Cancer Institute, Department of Diagnostic Radiology, National Institutes of Health, Bethesda, Maryland, Department of Renal Medicine, Huddinge Hospital, Huddinge, Department of Surgery, Karolinska Hospital, Stockholm, Department of Urology, Sahlgrenska Hospital, Gothenburg, Sweden, and Department of Pathology, Henry Ford Hospital, Detroit, Michigan