title: Plasma homocysteine, methylene tetrahydrofolate reductase C677T and factor II G20210A polymorphisms, factor VIII, and VWF in central retinal vein occlusion.
abstract: OBJECTIVE
  To determine whether plasma homocysteine, methylene tetrahydrofolate reductase (MTHFR) C677T and factor II G20210A polymorphisms, factor VIII, and vWF are risk factors for central retinal vein occlusion (CRVO).
  
  
  METHODS
  Prospective comparison of 63 consecutive patients with central retinal vein occlusion and 63 age matched controls. Plasma homocysteine and vWF were estimated by ELISA, the MTFHR and factor II G20210A polymorphisms determined by polymerase chain reaction with restriction enzyme product digestion and factor VIII by one stage automated clotting assay.
  
  
  RESULTS
  Plasma homocysteine (patients: median 12.4 micromol/l, controls: median 11.6 micromol OR = 1.05, p=0.20), factor VIII (patients: median = 115 U/dl, controls: median = 113 U/dl), and vWF (patients: median = 115 U/dl, controls: median = 108 U/dl) were not statistically higher in patients than in controls. Five CRVO patients and seven controls were homozygous for the MTHFR C677T mutation. One control was heterozygous for the factor II G20210A mutation.
  
  
  CONCLUSIONS
  This study has not identified new risk factors for CRVO.
authors.affiliation: Moorfields Eye Hospital, City Road, London EC1V 2PD, UK.
authors.forename: S
authors.initials: S
authors.lastname: Boyd
authors.forename: D
authors.initials: D
authors.lastname: Owens
authors.forename: T
authors.initials: T
authors.lastname: Gin
authors.forename: K
authors.initials: K
authors.lastname: Bunce
authors.forename: H
authors.initials: H
authors.lastname: Sherafat
authors.forename: D
authors.initials: D
authors.lastname: Perry
authors.forename: P G
authors.initials: PG
authors.lastname: Hykin
mesh_terms: D001777:Blood Coagulation / Q000502:physiology; D016022:Case-Control Studies; D004797:Enzyme-Linked Immunosorbent Assay; D005169:Factor VIII / Q000032:analysis*; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D016015:Logistic Models; D008754:Methylenetetrahydrofolate Dehydrogenase (NADP) / Q000235:genetics*; D008875:Middle Aged; D009154:Mutation / Q000235:genetics; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D011446:Prospective Studies; D011516:Prothrombin / Q000235:genetics*; D012170:Retinal Vein Occlusion / Q000097:blood* / Q000235:genetics*; D014841:von Willebrand Factor / Q000032:analysis*
chemical_list: D014841:von Willebrand Factor; D006710:Homocysteine; D011516:Prothrombin; D005169:Factor VIII; D008754:Methylenetetrahydrofolate Dehydrogenase (NADP)