Three distinct subgroups of hypodiploidy in lymphoblastic leukaemia

Christine J. Harrison, Anthony V. Moorman, Zoë J. Broadfield, Kan L. Cheung, Rachel L. Harris, G. Reza Jalali, Hazel M. Robinson, Kerry E. Barber, Sue M. Richards, Christopher D. Mitchell, Tim O.B. Eden, Ian M. Hann, Frank G.H. Hill, Sally E. Kinsey, Brenda E.S. Gibson, John Lilleyman, Ajay Vora, Anthony H. Goldstone, Ian M. Franklin, Jill DurrantMary Martineau

Research output: Contribution to journalArticlepeer-review

137 Scopus citations


This study of children and adults with acute lymphoblastic leukaemia (ALL) is the largest series of patients with hypodiploidy (<46 chromosomes) yet reported. The incidence of 5% was independent of age. Patients were subdivided by the number of chromosomes; near-haploidy (23-29 chromosomes), low hypodiploidy (33-39 chromosomes) and high hypodiploidy (42-45 chromosomes). The near-haploid and low hypodiploid groups were characterized by their chromosomal gains and a doubled hyperdiploid population. Structural abnormalities were more frequent in the low hypodiploid group. Near-haploidy was restricted to children of median age 7 years (range 2-15) whereas low hypodiploidy occurred in an older group of median age 15 years (range 9-54). Patients with 42-45 chromosomes were characterized by complex karyotypes involving chromosomes 7, 9 and 12. The features shared by the few patients with 42-44 chromosomes and the large number with 45 justified their inclusion in the same group. Survival analysis showed a poor outcome for the near-haploid and low hypodiploid groups compared to those with 42-45 chromosomes. Thus cytogenetics, or at least a clear definition of the modal chromosome number, is essential at diagnosis in order to stratify patients with hypodiploidy into the appropriate risk group for treatment.

Original languageEnglish (US)
Pages (from-to)552-559
Number of pages8
JournalBritish journal of haematology
Issue number5
StatePublished - Jun 1 2004
Externally publishedYes


  • Acute lymphoblastic leukaemia
  • Cytogenetics
  • Event free survival
  • Hypodiploidy

ASJC Scopus subject areas

  • Hematology


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