EEF1A2 and neoplasm: Truncated O-glycan Tn (GalNAcα1-Ser/Thr) and its sialylated variant sialyl-Tn (STn) (Neu5Acα2,6GalNAcα1-Ser/Thr) represent two modifications observed in a variety of proteins which give rise to two tumor-associated antigens that are not expressed in normal cells.