Endoscopy in Early Gastrointestinal Cancers, Volume 1: Diagnosis provides detailed information of the technique of novel endoscopic diagnostic tools including magnifying endoscopy, narrow band imaging system (NBI), autofluorescence endoscopy (AFI), endocytoscopy, FICE and confocal endomicroscopy.  Carcinoma of the gastrointestinal tract remained a major health issue worldwide, which is, however notoriously difficult to treat. One of the major reasons for such a poor result is that these cancers are diagnosed at advanced stage. There is a recent increase in the number of gastrointestinal cancers diagnosed at early stage. This is attributed to an increasing recognition of these early stage cancers through a recent development in the technology of endoscopy.