CSF3 and lymphoproliferative syndrome: The increased incidence of EBV (approximately 90%) in T cell–depleted haploidentical HSCT could lead to fatal lymphoproliferative disorders.23 In a trial of low-dose PTCy with ATG/granulocyte colony-stimulating factor, the CMV reactivation incidence was 73%, which requires an extra preemptive-like CMV–cytotoxic T lymphocyte strategy to prevent CMV disease.20 In this trial, the data indicated that infusion of MSCs did not increase the overall incidence of AEs and severe AEs.