Of the 606 cell surface proteins identified and quantified with high confidence (p-value <0.05), 65 were significantly up-regulated (Effect size >3) in the tumor group compared to the astrocyte group (Table S3), of which 6 (ABCB6, AKR1A1, AKT2, CRYAB, SLC1A3 and UCHL1) were not annotated as N-glycoproteins in the UniProtKB Knowledgebase. Here, AKT2 is linked to neoplasm.