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Expert’s introductionRobert S. Warren, MD (Figure 1) is a Professor of Surgery in the University of Califoia School of Medicine and a specialist in gastrointestinal and liver cancer. He eaed a medical degree at the University of Minnesota, where he completed a general surgery residency. After completing an oncology research fellowship at Memorial Sloan-Kettering Cancer Center in New York, Dr. Warren, joined UCSF Medical Center in 1988. A board-certified surgeon, he later became the Chief of Surgical Oncology at UCSF. Highly respected by his peers, Dr. Warren was named to the list of U.S. News "America’s Top Doctors", a distinction reserved for the top 1% of physicians in the nation for a given specialty. His research focuses on the biology of colorectal cancer (CRC) and how it spreads.