Abstract
Treatment of infants with acute lymphoblastic leukemia (ALL), especially those with mixed lineage leukemia (MLL) rearrangement (MLL-r), which account for approximately 80% of cases, is still a major challenge for pediatric hematologists and oncologists worldwide. Continuing efforts by collaborative clinical study groups in Europe, North America, and Japan have rescued approximately half of the MLL-r ALL patients with intensive chemotherapy with or without allogeneic hematopoietic stem cell transplantation. Recent progress has clarified the unique mechanism of MLL-r ALL: the aberrant methylation and histone modifications via DOT1L and other related molecules by MLL fusion proteins lead to leukemogenetic gene expression, thus to overt leukemia. In order to overcome this dismal subtype of ALL, novel targeted therapy based on leukemia biology is urgently needed. Due to the extreme rarity of the disease, collaboration between the study groups in Europe (Interfant), North America (Children's Oncology Group), and Japan (Japanese Pediatric Leukemia/Lymphoma Study Group) is under way.
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