CD40LG and systemic lupus erythematosus: Such analyses had revealed that the levels of IgM anti-ApoCell antibodies were significantly decreased in the sera of SS patients (median IgM anti-ApoCell binding index [range]: 1.34 [0.22–5.05]) compared to HBD (3.26 [1.44–5.97], p = 0.0079), but not in those from SLE and RA patients (SLE: 4.91 [0.60–8.50], RA: 2.48 [1.58–3.28], differences not significant).