| Completed | 3 | 368 | Europe | Dexamethasone, Etoposide, Cyclosporin, Intrathecal therapy, Stem cell transplant | Karolinska University Hospital, Azienda Ospedaliero, Universitaria Meyer, Leiden University Medical Center, Children's Hospital Medical Center, Cincinnati, Ehime University Graduate School of Medicine, Universitätsklinikum Hamburg-Eppendorf, Baylor College of Medicine, Great Ormond Street Hospital for Children NHS Foundation Trust, St. Anna Kinderkrebsforschung, Hospital de Cruces, Hospital JP Garrahan | Hemophagocytic Lymphohistiocytosis | 12/11 | 12/17 | | |