More importantly, recent studies have demonstrated that numbers of S100A8/A9-expressing macrophages increased in the ST of patients with RA after treatment with high dose of intravenous methylprednisolone and that high levels of S100A8 induced by glucocorticoids have anti-inflammatory properties independent of hetero-complex formation with S100A9 [43]. This evidence concerns the gene S100A9 and rheumatoid arthritis.