Allogeneic BMT from 2 antigen-mismatched donors has been difficult to perform without T-cell depletion. Seven patients with advanced-stage hematologic malignancies underwent BMT with intensified graft-versus-host disease prophylaxis consisting of tacrolimus, methotrexate, and methylprednisolone. No rejection or acute GVHD >or= grade III was observed. This preliminary result is very promising.