The expression of 70 apoptosis genes in relation to lineage, genetic subtype, cellular drug resistance, and outcome in childhood acute lymphoblastic leukemia

Amy Holleman, Monique L den Boer, Renée X de Menezes, Meyling H Cheok, Cheng Cheng, Karin M Kazemier, Gritta E Janka-Schaub, Ulrich Göbel, Ulrike B Graubner, William E Evans, Rob Pieters

Research output: Contribution to journalArticlepeer-review

113 Citations (Scopus)

Abstract

Childhood acute lymphoblastic leukemia (ALL) consists of various subtypes that respond differently to cytotoxic drugs and therefore have a markedly different clinical outcome. We used microarrays to investigate, in 190 children with ALL at initial diagnosis, whether 70 key apoptosis genes were differentially expressed between leukemic subgroups defined by lineage, genetic subtype, in vitro drug resistance, and clinical outcome. The expression of 44 of 70 genes was significantly different in T-versus B-lineage ALL, 22 genes differed in hyperdiploid versus nonhyperdiploid, 16 in TEL-AML1-positive versus-negative, and 13 in E2A-rearranged versus germ-line B-lineage ALL. Expression of MCL1 and DAPK1 was significantly associated with prednisolone sensitivity, whereas BCL2L13, HRK, and TNF were related to L-asparaginase resistance. BCL2L13 overexpression was also associated with unfavorable clinical outcome (P < .001). Multivariate analysis including known risk factors revealed that BCL2L13 expression was an independent prognostic factor (P = .011). The same trend was observed in a validation group of 92 children with ALL treated on a different protocol at St Jude (P = .051). In conclusion, ALL subtypes have a unique expression pattern of apoptosis genes and our data suggest that selective genes are linked to cellular drug resistance and prognosis in childhood B-lineage ALL.

Original languageEnglish
Pages (from-to)769-76
Number of pages8
JournalBlood
Volume107
Issue number2
DOIs
Publication statusPublished - 15 Jan 2006
Externally publishedYes

Keywords

  • Apoptosis
  • B-Lymphocytes/cytology
  • Cell Lineage
  • Child
  • Drug Resistance, Neoplasm/genetics
  • Gene Expression Profiling
  • Gene Expression Regulation, Neoplastic
  • Humans
  • Oligonucleotide Array Sequence Analysis
  • Ploidies
  • Precursor Cell Lymphoblastic Leukemia-Lymphoma/genetics
  • Prognosis
  • Risk Factors
  • T-Lymphocytes/cytology
  • Treatment Outcome

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