Ghassan K. Abou-Alfa, MD, is a member of the Gastrointestinal Oncology Service at Memorial Sloan-Kettering Cancer Center in New York, where he specializes in the treatment of primary liver cancer. Dr. Abou-Alfa received his medical degree from the American University of Beirut, Lebanon, and completed his post-doctoral training at Yale University School of Medicine. His research is dedicated to finding novel therapies and improving the effectiveness of current therapies for primary liver cancer, while continuing to understand the basic mechanisms of the disease and its therapies. Dr. Abou-Alfa also focuses on the study of prevention of recurrence of primary liver cancer after surgery and has many publications in the field of primary liver cancer. Dr. Abou-Alfa is a strong advocate for raising awareness about liver cancer and has lectured on the subject at universities worldwide. Ronald P. DeMatteo, MD, serves as Vice Chair of the Depart-ment of Surgery, Chief of the Division of General Surgical Oncology, and Director of the General Surgical Oncology Fellowship Program at Memorial Sloan-Kettering Cancer Center in New York City. He is a graduate of Johns Hopkins University and Cornell Medical School. He did his general surgery training at the University of Pennsylvania and a surgical oncology fellowship at Memorial Sloan-Kettering Cancer Center. He maintains a busy clinical practice and has performed several hundred major resections for cancer in the past five years. He has been the principal author or a co-author on numerous clinical research projects and chapters relating to hepatobiliary disease. He has lectured and has taught several postgraduate courses in this country and in Europe. Dr. DeMatteo is recognized as an international expert in gastrointestinal stromal tumor (GIST). He is the principal investigator of two multicenter trials. He has lectured in this country and in Europe on the treatment of patients with GIST. He has been a member of the consensus panels here and in Europe to establish treatment guidelines in GIST.