Outcome of children with acute lymphoblastic leukemia (ALL) has improved over the years, but not for those with multiple recurrences because of high therapy resistance and heavily pretreated history that potentially cause physical damages. We describe the case of an 11-year-old boy with a third relapse of ALL and a history of 2 allogeneic bone marrow transplantations. He was successfully treated with clofarabine combination chemotherapy and achieved a fourth remission at 16 months following haploidentical bone marrow transplantation with conditioning regimen of clofarabine and busulfan. Clofarabine/busulfan conditioning might be a preferable option for children with multiple recurrent ALL, and warrants further investigation.
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