PTX3 and rheumatoid arthritis: Pentraxin 3 (PTX3) is a newly discovered member of the long pentraxins, and an acute phase protein that has emerged as a new serological marker reflecting tissue inflammation and damage under diverse human pathological conditions [13], [14], such as acute myocardial infarction [15], small vessel vasculitis [16], rheumatoid arthritis [17], chronic kidney disease [18], septic shock and tuberculosis [19], [20].