ST6GAL1 and systemic lupus erythematosus: Hence, we decided to investigate ST6Gal-1 and α-2,3-sialyltransferase (ST3Gal-1 catalyzes α-2,3 sialylation, which is also involved in the tumorigenesis and in T-cell apoptosis [18–20]), to determine if they are good markers of disease activity in SLE.