A Phase 3, Multicenter, open label, study to Evaluate the EFficacy and SaFEty of Leukotac® (inolimomab) in pediatric patients with steroid resistant acute Graft versus Host Disease (SR-aGvHD)

Inclusion Criteria:

• Patients who develop a first episode of aGvHD stage ≥ II (Przepiorka et al., 1995), resistant to a first line therapy with steroids (lack of improvement after 5 days or progression after 3 days of treatment with corticosteroids at 2 mg/Kg methylprednisolone equivalent dose)
• Age 28 days to < 18 years old
• Allo-HSCT with any type of donor, stem cell source, GVHD prophylaxis or conditioning regimen
• Patients receiving Allo-HSCT for any indication (i.e. malignant or non-malignant disease)
• Signature of informed and written consent by the patient and/or by the patient's legally acceptable representative(s)

Exclusion Criteria:

• Isolated stage 1 skin SR-aGvHD
• Overlap chronic GvHD as defined by the NIH Consensus Criteria (Jagasia MH, 2015)
• Acute GvHD after donor lymphocytes infusion (DLI)
• Relapsed/persistent malignancy requiring rapid immune suppression withdrawal
• Other systemic drugs than corticosteroids for GvHD treatment (including extra-corporeal photopheresis). Drugs already being used for GvHD prevention (e.g. calcineurin inhibitors) are allowed.
• Active, uncontrolled bacterial, viral, or fungal infection requiring systemic therapy
• Known allergy or intolerance to Leukotac of one of its ingredients
• Pregnancy: positive urinary or blood test in female of childbearing potential; lactation; absence of effective contraceptive method for female and male of childbearing potential
• Other ongoing interventional protocol that might interfere with