Introduction Recently, it was recommended that a 3-drug combination of post-transplant cyclophosphamide (PT-Cy), tacrolimus (Tac) and mycophenolate mofetil should be used not only for mismatched transplants but also for closely matched donors. Regarding PT-Cy, it has been shown that a higher 1-year graft-versus-host disease (GVHD)-free and relapse-free survival was achieved compared to standard GVHD prophylaxis with an exclusive calcineurin inhibitor such as Tac and methotrexate [1].