Methylation markers identify high risk patients in IGHV mutated chronic lymphocytic leukemia

Epigenetics. 2011 Mar;6(3):300-6. doi: 10.4161/epi.6.3.14038. Epub 2011 Mar 1.

Abstract

Chronic lymphocytic leukemia (CLL) exhibits a very variable clinical course. Altered DNA methylation of genes has shown promise as a source of novel prognostic makers in a number of cancers. Here we have studied the potential utility of a panel of methylation markers (CD38, HOXA4 and BTG4) in 118 CLL patients. Each of the three loci assessed exhibited frequent methylation, as determined by COBRA analysis, and individually correlated with either good (CD38, BTG4 methylation) or poor (HOXA4 methylation) prognosis. Using a combined approach to produce an overall methylation score, we found that methylation score was significantly associated with time to first treatment in CLL patients. Multivariate Cox regression analysis revealed that methylation score was the strongest predictor of time to first treatment, and was independent of IGHV gene mutational status and CD38 expression. This study provides proof of principle that a panel of methylation markers can be used for additional risk stratification of CLL patients.

MeSH terms

  • ADP-ribosyl Cyclase 1 / genetics
  • ADP-ribosyl Cyclase 1 / metabolism
  • Biomarkers, Tumor / genetics*
  • Biomarkers, Tumor / metabolism
  • Cell Cycle Proteins / genetics
  • Cell Cycle Proteins / metabolism
  • Cohort Studies
  • DNA Methylation*
  • Female
  • Genes, Immunoglobulin Heavy Chain
  • Homeodomain Proteins / genetics
  • Homeodomain Proteins / metabolism
  • Humans
  • Leukemia, Lymphocytic, Chronic, B-Cell / diagnosis*
  • Leukemia, Lymphocytic, Chronic, B-Cell / epidemiology
  • Leukemia, Lymphocytic, Chronic, B-Cell / genetics
  • Male
  • Membrane Glycoproteins / genetics
  • Membrane Glycoproteins / metabolism
  • Mutation
  • Proportional Hazards Models
  • Risk Factors
  • Transcription Factors

Substances

  • BTG4 protein, human
  • Biomarkers, Tumor
  • Cell Cycle Proteins
  • Homeodomain Proteins
  • Membrane Glycoproteins
  • Transcription Factors
  • HOXA4 protein, human
  • CD38 protein, human
  • ADP-ribosyl Cyclase 1