TNF and type 2 diabetes mellitus: There were no significant differences in the levels of IL-1β, IL-2, IL-6 and TNF-α between T2DM + OU group and T2DM + SH + OU group, although the levels of IL-1β, IL-6 and TNF-α in T2DM + SH + OU group were higher than those in T2DM + OU group.