IL2 and acute lymphoblastic leukemia: WBC: white blood count; NA: not available; GAS: Group A Streptococcus; ESR: erythrocyte sedimentation rate; CRP: C-reactive protein; ALP: alkaline phosphate; AST: aspartate transaminase; ALT: alanine transaminase; PCR: polymerase chain reaction; IL-2: interleukin-2; INR: international normalised ratio PTT: partial thromboplastin time; INR: international normalized ratio; CMV: cytomegalovirus; EBV: Epstein-Barr virus; ACE: angiotensin-converting enzyme; ALL panel: acute lymphocytic leukemia