The sialyl-Tn (STn) antigen (Neu5Acα2-6Gal-NAcα1-O-Ser/Thr), also known as CD175s, is a mucin-type carbohydrate antigen, and STn antigen is aberrantly expressed in a variety of carcinomas, including gastric [11, 12], colorectal [13], ovarian [14], breast [15], and pancreatic [16] cancers. The gene discussed is EEF1A2; the disease is carcinoma.