Level of circulating microparticles (MPs), secretory phospholipase A2 (sPLA2), sCD40L, sCD62P in patients with primary Sjögren syndrome (pSS), systemic lupus erythematosus (SLE), rheumatoid arthritis (RA) and in healthy controls (HCs). The gene discussed is CD40LG; the disease is rheumatoid arthritis.