A Study of Itolizumab in Combination With Corticosteroids for the First-Line Treatment of Acute Graft Versus Host Disease (EQUATOR)

Inclusion Criteria

• Is willing and able to provide written informed consent/assent and to comply with all protocol procedures and assessments required for the study.
• Is age ≥12 years and >40kg at informed consent/assent.
• Has had an initial allogeneic HSCT for any indication using any graft source, donor source, conditioning regimen intensity or prophylaxis.
• Has evidence of myeloid engraftment
• Has a clinical diagnosis of aGVHD Grades III-IV or Grade II with LGI involvement based on Mount Sinai Acute GVHD International Consortium (MAGIC) grading criteria.
• Began systemic corticosteroid treatment for aGVHD ≤72 hours prior to the start of study drug dosing AND must receive 2 mg/kg/day methylprednisolone or equivalent on Day 1.

Exclusion Criteria

• Evidence of morphological relapsed, progressive, persistent, or untreated malignancy, with the exception of nonmelanoma skin cancer and in situ ductal carcinoma of the breast.
• An unplanned donor lymphocyte infusion for persistent or recurrent malignancy after HSCT.
• Evidence of persistent molecular disease requiring treatment that was not specified prior to HSCT.
• Evidence of cGVHD or overlap syndrome
• Use of immunosuppressants other than corticosteroids for the treatment of aGVHD.
• Use of any systemic corticosteroids of >0.5 mg/kg/day methylprednisolone or equivalent for any indication other than aGVHD within 7 days before the onset of aGVHD.