Similar to our previous study in rheumatoid arthritis, where intra-articular glucocorticoid treatment decreased both the number and the frequency of FOXP3+ Tregs in synovial tissue [36], we observed a decrease in the number of FOXP3+ cells in myositis muscle tissue upon glucocorticoid-based immunosuppresive treatment. Here, FOXP3 is linked to rheumatoid arthritis.