- Acquired bone marrow failure disorders include aplastic anemia, paroxysmal nocturnal hemoglobinuria (PNH) * Primary allogeneic HSCT is appropriate for selected patients with severe aplastic anemia; however, patients with aplastic anemia must have failed at least one cycle of standard immunosuppressive therapy with calcineurin inhibitor plus anti-thymocyte globulin (ATG) if a fully matched donor is available * Patients with PNH should not be eligible for a myeloablative HSCT