Book excerpt: Since a number of mucosal digestive tract cancer detected has increased in recent years with an advance of endoscopic instruments, endoscopic treatment of digestive tract cancer is widely spread in Japan but not in other countries. Minute cancers seem to have own characteristic mucosal signs compared with benign lesions. Therefore, strategies, those are different in Japan from other countries, of endoscopic diagnosis are very important. The cancer institute hospital of JFCR (Japan foundation of cancer research) is one of the top institutions which do the best endoscopic treatment in Japan. This book is expected to be the first valuable atlas in which the abundant experiences of this hospital offer beautiful photographs of minute cancers without any scars of biopsies which change aspects of original lesions. This book also offer pictures of magnifying endoscopy using NBI (Narrow Band Imaging) and pathological findings.