We studied the level of IgG Abs that are reactive to TAGs, namely anti-TFα, -Tn, and cancer-irrelevant xenoreactive anti-αGal, as well as anti-GalNAcβ and -PFdi (structures shown in Table 1), in the sera of patients with gastric, colorectal, and breast cancer [8,19,20,21,22]. Here, F3 is linked to cancer.