Causes of death in 109 patients randomized to receive no ATG (n = 53), 7.5 mg/kg ATG (n = 29), or 15 mg/kg ATG (n = 27).

Acute GVHD was the cause of death in 36% of patients not receiving ATG, 28% of patients receiving 7.5 mg/kg ATG, and 11% of patients receiving 15 mg/kg ATG. Infections were, on the contrary, more frequent in patients receiving high-dose ATG.