IL10 and rheumatoid arthritis: The frequency and the absolute number of mature/memory (CD24hiCD27+) cells, of immature (CD24hiCD38hi) transitional B cells, and of IL-10-producing Breg cells have been shown to be decreased in RA versus healthy controls, and increased after therapy with MTX together with the anti-TNF-α inhibitors, adalimumab or etanercept [41,42,43,44].