These guest editors have assembled a high-profile group of international authors to present state-of-the-art information on advances in diagnostic modalities for gastrointestinal cancer. Special attention is given to magnification endoscopy and narrow band imaging, confocal endomicroscopy, PET scanning, and single fiber endoscopy. Clinical entities discussed include gastric cancer, biliary cancer, pancreatic cancer, esophageal cancer (Barretts Esophagus), colorectal cancer, intraductal papillary mucinous neoplasms, as well as gastric tumors.