1. From the Department of Pathology, Cedars-Sinai Medical Center, Los Angeles, Calif (Dr Marchevsky); the Department of Pathology, LDS Hospital and University of Utah School of Medicine, Salt Lake City (Dr Hammond); the Department of Pathology, M. D. Anderson Cancer Center, Houston, Tex (Dr Moran); and the Department of Pathology, Ohio State University School of Medicine, Columbus (Dr Suster)