Published in:
Open Access
01-12-2014 | Research
Clinical and genetic features of pediatric acute lymphoblastic leukemia in Down syndrome in the Nordic countries
Authors:
Catarina Lundin, Erik Forestier, Mette Klarskov Andersen, Kirsi Autio, Gisela Barbany, Lucia Cavelier, Irina Golovleva, Sverre Heim, Kristiina Heinonen, Randi Hovland, Johann H Johannsson, Eigil Kjeldsen, Ann Nordgren, Lars Palmqvist, Bertil Johansson, the Swedish Cytogenetic Leukemia Study Group (SCLSG), the NOPHO Leukemia Cytogenetic Study Group (NLCSG)
Published in:
Journal of Hematology & Oncology
|
Issue 1/2014
Login to get access
Abstract
Background
Children with Down syndrome (DS) have an increased risk for acute lymphoblastic leukemia (ALL). Although previous studies have shown that DS-ALL differs clinically and genetically from non-DS-ALL, much remains to be elucidated as regards genetic and prognostic factors in DS-ALL.
Methods
To address clinical and genetic differences between DS-ALL and non-DS-ALL and to identify prognostic factors in DS-ALL, we ascertained and reviewed all 128 pediatric DS-ALL diagnosed in the Nordic countries between 1981 and 2010. Their clinical and genetic features were compared with those of the 4,647 B-cell precursor (BCP) ALL cases diagnosed during the same time period.
Results
All 128 DS-ALL were BCP ALL, comprising 2.7% of all such cases. The 5-year event-free survival (EFS) and overall survival (OS) were significantly (P = 0.026 and P = 0.003, respectively) worse for DS-ALL patients with white blood cell counts ≥50 × 109/l. The age distributions varied between the DS and non-DS cases, with age peaks at 2 and 3 years, respectively; none of the DS patients had infant ALL (P = 0.029). The platelet counts were lower in the DS-ALL group (P = 0.005). Abnormal karyotypes were more common in non-DS-ALL (P < 0.0001), and there was a significant difference in the modal number distribution, with only 2% high hyperdiploid DS-ALL cases (P < 0.0001). The 5-year EFS and 5-year OS were significantly worse for DS-ALL (0.574 and 0.691, respectively) compared with non-DS-ALL (0.783 and 0.894, respectively) in the NOPHO ALL-1992/2000 protocols (P < 0.001).
Conclusions
The present study adds further support for genetic and clinical differences between DS-ALL and non-DS-ALL.