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Blood, 15 March 2008, Vol. 111, No. 6, pp. 2991-2998. Prepublished online as a Blood First Edition Paper on January 8, 2008; DOI 10.1182/blood-2007-10-118810.
CLINICAL TRIALS AND OBSERVATIONS Treatment and prognostic impact of transient leukemia in neonates with Down syndrome1 Department of Pediatric Hematology and Oncology, Medical School Hannover, Hannover, Germany; 2 Department of Pediatric Hematology and Oncology, University Children's Hospital, Muenster, Germany; 3 St Anna Kinderspital and Childrens Cancer Research Institute, Vienna, Austria; 4 Kinderklinik Krankenanstalten Gilead, Bielefeld, Germany; 5 University Hospital Hamburg-Eppendorf, University Hamburg, Hamburg, Germany; and 6 Prof-Hess-Kinderklinik, Klinikum Bremen-Mitte, Bremen, Germany Approximately 10% of the neonates with Down syndrome (DS) exhibit a unique transient leukemia (TL). Though TL resolves spontaneously in most patients, early death and development of myeloid leukemia (ML-DS) may occur. Prognostic factors as well as treatment indication are currently uncertain. To resolve that issue, we prospectively collected clinical, biologic, and treatment data of 146 patients with TL. The 5-year overall survival (OS) and event-free survival (EFS) were 85% plus or minus 3% and 63% plus or minus 4%, respectively. Multivariate analysis revealed a correlation between high white blood cell (WBC) count, ascites, preterm delivery, bleeding diatheses, failure of spontaneous remission, and the occurrence of early death. Treatment with cytarabine (0.5-1.5 mg/kg) was administered to 28 patients with high WBC count, thrombocytopenia, or liver dysfunction. The therapy had a beneficial effect on the outcome of those children with risk factors for early death (5-year EFS, 52% ± 12% vs 28% ± 11% [no treatment]; P = .02). Multivariate analysis demonstrated its favorable prognostic impact. A total of 29 (23%) patients with TL subsequently developed ML-DS. Patients with ML-DS with a history of TL had a significantly better 5-year EFS (91% ± 5%) than those without documented TL (70% ± 4%), primarily due to a lower relapse rate. A history of TL may therefore define a lower-risk ML-DS subgroup. This study was registered at www.clinicaltrials.gov as no. NCT 00111345.
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