TBXT and cancer: In cancer states, truncated forms such as the Tn antigen (Thomsen nouveau; GalNAcα-Ser/Thr), sialylated STn-antigen (sialyl-Tn; Neu5Acα2–6GalNAcα-Ser/Thr) and the elongated T-antigen (Thomsen–Friedenreich; Galβ1-3GalNAcα-Ser/Thr) are observed [7,8].