H19 and rheumatoid arthritis: LncRNA H19, Hotair, lincRNA-p21, C5T1, LOC100652951, and LOC100506036 have been verified to be dysregulated in T cells, peripheral blood mononuclear cells (PBMCs), exosomes, and synovial cells in RA, which are associated with inflammation and immune reaction in RA (Table 1) (24–27, 61).