Cellular glycoconjugates and their specific receptors, e.g. lectins, form a recognitive and informative transfer system that justifies special scientific and clinical attention. In various contributions reviewing the initiation and recent progress in this rapidly developing field advances in clinical oncology are discussed with regard to basic sciences as well as their application in clinical sciences. The approaches comprise reports from diverse fields such as biochemistry, cell biology, pathology and clinical oncology, addressing questions of how tumors grow and spread, and leading to the improvement of clinical management and tumor diagnosis.