%0 Journal Article %T Risk of significant cytopenias after treatment with tocilizumab in systemic juvenile arthritis patients with a history of macrophage activation syndrome %A Kessler Elizabeth A %A Vora Sheetal S %A Verbsky James W %J Pediatric Rheumatology %D 2012 %I BioMed Central %R 10.1186/1546-0096-10-30 %X Tocilizumab (TCZ) is the first FDA- approved treatment for systemic juvenile idiopathic arthritis (sJIA). We report 3 cases of cytopenias in children with sJIA treated with TCZ. Two of the children who developed significant cytopenias shortly after initiation of TCZ had a history of macrophage activation syndrome. We raise the possibility that patients with a tendency towards MAS have an increased risk of developing cytopenias when treated with tocilizumab. %K Juvenile idiopathic arthritis %K Macrophage activation syndrome %K Tocilizumab %U http://www.ped-rheum.com/content/10/1/30