MUC1 and neoplasm: T]his membrane-localized glycoprotein is overexpressed and aberrantly glycosylated in most epithelial cancers 125, and the aberrant glycosylation of MUC1 might result in the shortening of the sugar chain, causing the exposure of hidden antigens; the hidden antigens usually have peptidic and carbohydrate properties, making the MUC1 epitope tumor-specific 126.