title: Effect of prothrombin 19911 A>G polymorphism on the risk of cerebral sinus-venous thrombosis.
abstract: OBJECTIVE
  The A>G polymorphism at position 19911 of the prothrombin gene is associated with a mildly increased risk of venous thromboembolism, alone or in association with such common thrombophilia mutations as factor V Leiden and prothrombin 20210 GA. Its role in cerebral sinus-venous thrombosis (CSVT) is not known.
  
  
  METHODS
  The presence of prothrombin 19911 A>G was investigated in a case–control study of 107 patients with cerebral thrombosis and factor V Leiden (n = 25), prothrombin 20210 GA (n = 47), without known thrombophilia (n = 35) and 842 healthy individuals with the corresponding coagulation profile.
  
  
  RESULTS
  Prothrombin 19911 A>G did not increase the risk of CSVT in carriers of factor V Leiden (adjusted odds ratio 1.6, 95%CI 0.6–4.7), prothrombin 20210 GA (odds ratio 1.1, 95%CI 0.6–2.2), nor in patients without known thrombophilia (odds ratio 1.3, 95%CI 0.5–3.1).
  
  
  CONCLUSIONS
  Prothrombin 19911 A>G polymorphism does not appear to be a risk factor for CSVT, alone or in association with factor V Leiden or prothrombin 20210GA.
authors.affiliation: A. Bianchi Bonomi Haemophilia and Thrombosis Center, Department of Internal Medicine and Medical Specialties, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, University of Milan, Milan, Italy. martin@policlinico.mi.it
authors.forename: I
authors.initials: I
authors.lastname: Martinelli
authors.forename: P
authors.initials: P
authors.lastname: Bucciarelli
authors.forename: V
authors.initials: V
authors.lastname: De Stefano
authors.forename: S M
authors.initials: SM
authors.lastname: Passamonti
authors.forename: M
authors.initials: M
authors.lastname: Menegatti
authors.forename: D
authors.initials: D
authors.lastname: Tormene
authors.forename: A
authors.initials: A
authors.lastname: Tosetto
authors.forename: P M
authors.initials: PM
authors.lastname: Mannucci
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005165:Factor V / Q000235:genetics; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011516:Prothrombin / Q000235:genetics*; D012851:Sinus Thrombosis, Intracranial / Q000235:genetics*; D019851:Thrombophilia / Q000235:genetics
chemical_list: C095381:factor V Leiden; D005165:Factor V; D011516:Prothrombin