HLH Hemophagocytic lymphohistiocytosis
M-HLH Malignancy-associated hemophagocytic lymphohistiocytosis
NK Natural killer
B-ALL B-cell acute lymphoblastic leukemia
COG Children’s Oncology Group
EBV Epstein-Barr virus
sIL-2 Soluble interleukin-2
CXCL9 Chemokine (CXC motif) ligand 9
IFNγ Interferon gamma
JAK Janus kinase
IL-6 Interleukin 6