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manufacturers’ browsers. Leukemias / Lymphomas : Leukemias (high
risk hematologic malignancies) Hematologic malignancies (blood
cell cancers) in very young children are hard to treat with
standard doses of chemotherapy (anti-cancer drugs). Stem cell
transplantation (infusion of healthy blood forming cells) has
been used but has not always been successful. The best donor of
stem cells is a sibling (brother or sister) who is a match (the
sibling’s cells match the subject’s immune type, or HLA type).
But few very young children with leukemia have a matched sibling
donor. This research study is for those children who do not have
a matched sibling donor. In this study, a parent will be the
stem cell donor. Using a parent donor (a parent donor is a
partial match for the subject’s HLA typ