GYG1 and cancer: Gn1-core glycans, which possessed the corresponding antennal structures of major Gn2-core glycans, were also observed at increased levels in the urine of cancer patients (#62 and 78 → #52, #65 and 67 → #53, #66 and 79 → #54, #68 → 38; Fig 1, Fr 3 and 4; Fig E-d in S2 File).