IDO1 and rheumatoid arthritis: In additional analyses, patients diagnosed with RA, SLE, or Sjögren ́s syndrome (n = 13) were compared with other patients, and patients treated with steroids and/or methotrexate (n = 13) were compared with other patients, but there were no differences in high or low amounts of follicular and interfollicular IDO1+ or PD-L2+ cells in these analyses (Table 1).