1. From the Departments of Medicine, Biostatistics, and Surgery, Institut Gustave Roussy, Villejuif; Centre de Chirurgie Viscerale et de Transplantation, Hopital de Hautepierre, Strasbourg; Commisariat à l'Energie Atomique, Fontenay-aux-roses, France; and the Departments of Surgical Oncology, Gastrointestinal Medical Oncology, and Pathology, The University of Texas M.D. Anderson Cancer Center, Houston, TX