CD40LG and systemic lupus erythematosus: GD group had a lower prevalence of T3‐T4Ab and IgG and IgM‐Ab than SLE group (p = 0.044; p = 0.010) and had a lower prevalence of overall THAb and isolated IgM‐Ab than pSS group ((p = 0.025; p = 0.016) (Figure 1).