For instance, theglycoprotein MUC1 is overexpressed in many tumor tissues and tendsto carry simple oligosaccharides that allow for the presentation ofdifferent tumor-associated antigens, such as the Tn or sTn antigens(GalNAc-α-1-O-Thr/Ser and Neu5Acα2-6GalNAcα1-O-Ser/Thr,respectively). This evidence concerns the gene MUC1 and neoplasm.