Celso A. Reis is the Head of the Glycobiology in Cancer group at i3S/Ipatimup, University of Porto. He graduated with a degree in Biology in 1991, and completed her PhD degree in Human Biology, in 1998, both from the Faculty of Medicine of the University of Porto. Her main areas of interest are the role of glycosylation in human cancer. He has addressed the molecular mechanisms controlling glycosylation in cancer cell biology and, more specifically, the role of glycosyltransferases regulating the biosynthesis of glycans in cancer. This includes the role of sialyltransferases leading to the biosynthesis of terminal sialylated glycan antigens expressed by cancer cells, such as ST6GalNAc determining the aberrant expression of the simple O-glycan Sialyl-Tn antigen, and the ST3Gal-transferases and Fucosyltransferases controlling the expression of sialyl-Lewis antigens.