HSPA5 and rheumatoid arthritis: With respect to the present work, the differential expression of GRP78 of plasma cells in distinct variants of rheumatoid synovitis, and the positive association between the expression of GRP78 of plasma cells and the local production of anti-CCP (IgG) within RA-inflamed peripheral joints, may provide partial evidence for the links between ectopic lymphoid neogenesis in rheumatoid synovium and the differentiation of autoantibody-secreting plasma cells as well as the ongoing local autoimmunity [1,39,40].