FLAG with Bortezomib Salvage Therapy in Relapsed/Refractory Childhood Leukemia-A Reliable Bridge to Transplantation with Limited Toxicity.

Relapsed refractory leukemia represents a difficult-to-treat population of patients. The balance between perceived benefit and potential side effects along with the significant financial burden of managing multidrug-resistant sepsis are factors that determine the choice of salvage regimen. Here, we present our experience with the combination of fludarabine, cytarabine, granulocyte-colony stimulating factor with bortezomib. The morphological complete response rate was 58% with 50% of the patients achieving complete remission. With only three patients requiring intensive care unit admission during remission induction, 66.6% of the patients went on to undergo successful hematopoietic stem cell transplantation. Thus, it proved to be a possible, safer alternative to other salvage regimens, while enabling a significant percentage of patients to achieve remission and proceed to allogenic stem cell transplantation.