title: Association between single nucleotide polymorphism-genotype and outcome of patients with chronic lymphocytic leukemia in a randomized chemotherapy trial.
abstract: BACKGROUND
  There is variability in the outcome of patients with chronic lymphocytic leukemia with apparently the same stage of disease. Identifying genetic variants that influence patients' outcome and response to treatment may provide important insights into the biology of the disease.
  
  
  METHODS
  We investigated the possibility that genetic variation influences outcome by conducting a genome-wide analysis of 346,831 single nucleotide polymorphisms in 356 patients entered into a phase III trial comparing the efficacy of fludarabine, chlorambucil, and fludarabine with cyclophosphamide as first-line treatment. Genotypes were linked to individual patients' outcome data and response to chemotherapy. The association between genotype and progression-free survival was assessed by Cox regression analysis adjusting for treatment and clinicopathology.
  
  
  RESULTS
  The strongest associations were shown for rs1949733 (ACOX3; P=8.22x10-7), rs1342899 (P=7.72×10(-7)) and rs11158493 (PPP2R5E; P=8.50×10(-7)). In addition, the 52 single nucleotide polymorphisms associated at P<10(-4) included rs438034 (CENPF; P=4.86×10(-6)), previously correlated with cancer progression, and rs2255235 (B2M; P=3.10×10(-5)) and rs2064501 (IL22RA2; P=4.81×10(-5)) which map to B-cell genes.
  
  
  CONCLUSIONS
  Our findings provide evidence that genetic variation is a determinant of progression-free survival of patients with chronic lymphocytic leukemia. Specific associations warrant further analyses.
authors.affiliation: Clinical Trial Service Unit, University of Oxford, Oxford, UK.
authors.forename: Rachel
authors.initials: R
authors.lastname: Wade
authors.forename: Maria Chiara
authors.initials: MC
authors.lastname: Di Bernardo
authors.forename: Sue
authors.initials: S
authors.lastname: Richards
authors.forename: Davide
authors.initials: D
authors.lastname: Rossi
authors.forename: Dalemari
authors.initials: D
authors.lastname: Crowther-Swanepoel
authors.forename: Gianluca
authors.initials: G
authors.lastname: Gaidano
authors.forename: David G
authors.initials: DG
authors.lastname: Oscier
authors.forename: Daniel
authors.initials: D
authors.lastname: Catovsky
authors.forename: Richard S
authors.initials: RS
authors.lastname: Houlston
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D015973:Gene Expression Regulation, Leukemic; D005838:Genotype; D060005:Genotyping Techniques; D006801:Humans; D053208:Kaplan-Meier Estimate; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000188:drug therapy / Q000235:genetics* / Q000401:mortality* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D020641:Polymorphism, Single Nucleotide; D054648:Protein Phosphatase 2 / Q000235:genetics; D011786:Quality Control; D012333:RNA, Messenger; D015203:Reproducibility of Results
chemical_list: C525692:PPP2R5E protein, human; D012333:RNA, Messenger; D054648:Protein Phosphatase 2