| Inclusion Criteria: | The patient is scheduled to receive a bone marrow transplant from an unrelated donor.
The donor must be a genotypic match based upon intermediate resolution molecular typing of class I loci (HLA-A, and B loci) and high resolution molecular typing for DRB1 loci. For centers in which high resolution typing of class I loci is routinely performed, a one antigen minor allelic mismatch is allowed.
The patient is < 21 years of age at the time of study entry. |