Differences in the diagnostic criteria for early cancer of the gastrointestinal tract between Japan and Western countries have been an interesting issue for some time, physicians in Japan being much more inclined to give a diagnosis of cancer than their European and North American counterparts. This book addresses those differences by contrasting the views of Eastern and Western endoscopists and pathologists on 24 cases presented in Part I. The following sections examine and discuss the Vienna consensus criteria, early cancer in Barrett’s esophagus, early detection of cancers, endoscopic treatments, the natural course of early cancer, and diagnostic methods and treatments for early cancer. These all deal with esophagus, stomach, and colorectal cancers. This book will be an indispensable and unique resource for all pathologists, endoscopists, and surgeons who are involved in managing gastrointestinal cancer.