TNFSF13B and rheumatoid arthritis: It has also been reported that BAFF and its receptors act as trophic factors in lymphocyte malignancies and immune-related disorders, such as systemic lupus erythematosus (SLE), Sjögren’s syndrome, and rheumatoid arthritis (RA), which are characterized by the production of pathogenic autoantibodies against certain nuclear antigens and DNA [7–9].