1. From the Department of Pathology, University of Texas M. D. Anderson Cancer Center, Houston, Tex (Dr Granville); Department of Pathology, Baylor College of Medicine, Houston, Tex (Dr Laga); Department of Pathology, University of Texas Health Center at Tyler (Dr Allen); Department of Pathology, Texas Children's Hospital, Houston (Dr Dishop); Department of Pathology, Duke University Medical Center,