title: Apolipoprotein E phenotype frequency and cerebrospinal fluid concentration are not associated with Creutzfeldt-Jakob disease.
abstract: OBJECTIVE
  To analyze the distribution of apolipoprotein E (Apo E) phenotypes between patients with Creutzfeldt-Jakob disease (CJD) and control subjects.
  
  
  METHODS
  University hospital, base of the German National CJD Surveillance Study.
  
  
  METHODS
  Prospective case-control study.
  
  
  METHODS
  Sixty-two patients with definite or probable CJD, 90 patients with initial suspected CJO, and 51 controls matched for age, sex, and place of residence.
  
  
  METHODS
  Phenotyping of Apo E in serum by isoelectric focusing, assessment of the gels by 3 independent investigators, measurement of of Apo E in cerebrospinal fluid using an enzyme-linked immunosorbent assay, and calculation of Kaplan-Meier cumulative survival plots.
  
  
  RESULTS
  The most frequent phenotype was E 3-3 with 56% in patients and 59% in controls, followed by E 3-4 with a frequency of 29% vs 25%, respectively. The phenotype E 3-2 was much rarer (13% vs 16%, respectively). Patients with definite CJD had a mean (SD) Apo E concentration of 3.4 (2.0) mg/L; patients with probable CJD, 3.1 (1.6) mg/L; patients with possible CJD, 3.8 (2.2) mg/L; and subjects with other diseases, 3.0 (1.7) mg/L. Mean (SD) disease duration for patients with E 3-2 was 11.8 (9.8) months; for patients with E 3-3, 12.0 (9.02) months; and for patients with E 3-4, 14.2 (12.3) months.
  
  
  CONCLUSIONS
  We found no significant difference in the distribution of Apo E phenotypes between patients with CJD and controls. The concentration of Apo E in cerebrospinal fluid cannot be taken as a biochemical marker for the disease. The Apo E phenotype had no influence on the duration of CJD. Our data do not support an association of Apo E4 with either the duration or time at onset of CJD.
authors.affiliation: Neurologische Klinik, Georg-August-Universität Göttingen, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Zerr
authors.forename: M
authors.initials: M
authors.lastname: Helmhold
authors.forename: S
authors.initials: S
authors.lastname: Poser
authors.forename: V W
authors.initials: VW
authors.lastname: Armstrong
authors.forename: T
authors.initials: T
authors.lastname: Weber
mesh_terms: D000328:Adult; D000368:Aged; D001057:Apolipoproteins E / Q000134:cerebrospinal fluid* / Q000235:genetics*; D016022:Case-Control Studies; D007562:Creutzfeldt-Jakob Syndrome / Q000134:cerebrospinal fluid / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D011446:Prospective Studies
chemical_list: D001057:Apolipoproteins E