In "beijing model" for haploidentical transplant, the rate of acute graft-versus-host disease (GVHD) from maternal or collateral donors was significantly higher than that from other kins. To reduce the GVHD incidence from maternal or collateral donors, post-transplantation cyclophosphamide is planned to be added into the protocol in "beijing model".

Inclusion Criteria:

• haploidentical patients from maternal or collateral donors

Exclusion Criteria:

• uncontrolled infection before transplant