Response to ‘Application of MS score in macrophage activation syndrome patients associated with adult onset Still’s disease’ by Wang et al

We are grateful to Wang et al 1 for testing our diagnostic score for macrophage activation syndrome (MAS)2 in their patients with adult onset Still disease (AOSD). Because it is increasingly recognised that systemic juvenile idiopathic arthritis (sJIA) and AOSD represent the same disease occurring at different ages3 4 and considering that the two illnesses share a similar risk for MAS, it is important to investigate whether the current...