Complex karyotype newly defined: the strongest prognostic factor in advanced childhood myelodysplastic syndrome

Blood. 2010 Nov 11;116(19):3766-9. doi: 10.1182/blood-2010-04-280313. Epub 2010 Aug 27.

Abstract

To identify cytogenetic risk factors predicting outcome in children with advanced myelodysplastic syndrome, overall survival of 192 children prospectively enrolled in European Working Group of Myelodysplastic Syndrome in Childhood studies was evaluated with regard to karyotypic complexity. Structurally complex constitutes a new definition of complex karyotype characterized by more than or equal to 3 chromosomal aberrations, including at least one structural aberration. Five-year overall survival in patients with more than or equal to 3 clonal aberrations, which were not structurally complex, did not differ from that observed in patients with normal karyotype. Cox regression analysis revealed the presence of a monosomal and structurally complex karyotype to be strongly associated with poor prognosis (hazard ratio = 4.6, P < .01). Notably, a structurally complex karyotype without a monosomy was associated with a very short 2-year overall survival probability of only 14% (hazard ratio = 14.5; P < .01). The presence of a structurally complex karyotype was the strongest independent prognostic marker predicting poor outcome in children with advanced myelodysplastic syndrome.

Trial registration: ClinicalTrials.gov NCT00047268 NCT00662090.

Publication types

  • Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Anemia, Refractory, with Excess of Blasts / genetics
  • Anemia, Refractory, with Excess of Blasts / mortality
  • Anemia, Refractory, with Excess of Blasts / therapy
  • Child
  • Chromosome Aberrations
  • Cytogenetic Analysis
  • Female
  • Hematopoietic Stem Cell Transplantation
  • Humans
  • Kaplan-Meier Estimate
  • Karyotyping
  • Male
  • Monosomy
  • Myelodysplastic Syndromes / genetics*
  • Myelodysplastic Syndromes / mortality
  • Myelodysplastic Syndromes / therapy
  • Prognosis
  • Prospective Studies
  • Risk Factors

Associated data

  • ClinicalTrials.gov/NCT00047268
  • ClinicalTrials.gov/NCT00662090