CD40LG and neoplasm: Other antibodies recognized what are referred to as oncofetal antigens or tumor-associated carbohydrate antigens (glycans that have high expression during development and in various cancer cells but have low expression in healthy adult tissue).[38, 54] For example, we found abundant IgM antibodies to glycopeptides containing the tumor-associated Tn antigen (GalNAc alpha linked to a serine or threonine).