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Thoas Fioretos

Thoas Fioretos

Research team manager

Thoas Fioretos

The correlation pattern of acquired copy number changes in 164 ETV6/RUNX1-positive childhood acute lymphoblastic leukemias


  • Henrik Lilljebjörn
  • Charlotte Soneson
  • Anna Andersson
  • Jesper Heldrup
  • Mikael Behrendtz
  • Norihiko Kawamata
  • Seishi Ogawa
  • H. Phillip Koeffler
  • Felix Mitelman
  • Bertil Johansson
  • Magnus Fontes
  • Thoas Fioretos

Summary, in English

The ETV6/RUNX1 fusion gene, present in 25% of B-lineage childhood acute lymphoblastic leukemia (ALL), is thought to represent an initiating event, which requires additional genetic changes for leukemia development. To identify additional genetic alterations, 24 ETV6/RUNX1-positive ALLs were analyzed using 500K single nucleotide polymorphism arrays. The results were combined with previously published data sets, allowing us to ascertain genomic copy number aberrations (CNAs) in 164 cases. In total, 45 recurrent CNAs were identified with an average number of 3.5 recurrent changes per case (range 0-13). Twenty-six percent of cases displayed a set of recurrent CNAs identical to that of other cases in the data set. The majority (74%), however, displayed a unique pattern of recurrent CNAs, indicating a large heterogeneity within this ALL subtype. As previously demonstrated, alterations targeting genes involved in B-cell development were common (present in 28% of cases). However, the combined analysis also identified alterations affecting nuclear hormone response (24%) to be a characteristic feature of ETV6/RUNX1-positive ALL. Studying the correlation pattern of the CNAs allowed us to highlight significant positive and negative correlations between specific aberrations. Furthermore, oncogenetic tree models identified ETV6, CDKN2A/B, PAX5, del(6q) and +16 as possible early events in the leukemogenic process.


  • Division of Clinical Genetics
  • Mathematics (Faculty of Engineering)
  • Paediatrics (Lund)
  • BioCARE: Biomarkers in Cancer Medicine improving Health Care, Education and Innovation

Publishing year







Human Molecular Genetics





Document type

Journal article


Oxford University Press


  • Medical Genetics




  • ISSN: 0964-6906