Prominent peaks of Gn1-core glycans having antennal sialyl LacdiNAc (GalNAcβ1-4GlcNAc) or bisecting GlcNAc were identified from one gastric cancer patient G11 (#10, 11, 21–23 and 37; in Fig 1, Fr 1–3). Here, GYG1 is linked to gastric cancer.