title: Family history as a risk factor for venous thromboembolism.
abstract: BACKGROUND
  There are very few data assessing a family history of venous thromboembolism (VTE) as a risk factor for VTE. This question is nonetheless of interest as inherited risk factors are involved but at least partly unknown.
  
  
  METHODS
  The E.D.I.TH. study is a prospective hospital-based case-control study. The family history was assessed by using a standard questionnaire, considering the total number of the first-degree relatives and the number of these relatives who had suffered from VTE. We analysed 698 first VTE cases and their matched controls, 507 pairs without and 191 pairs with a major acquired risk factor (active malignancy, surgery or plaster cast in the past three months, pregnancy or delivery in the past three months).
  
  
  RESULTS
  A family history of VTE was associated with VTE occurrence, irrespective of carrying or not factor V Leiden mutation or G20210A prothrombin gene mutation and irrespective of the presence or absence of major acquired risk factors; adjusted conditional odds ratio: 2.7 (95%CI, 1.8-3.8).
  
  
  CONCLUSIONS
  A family history might well be considered when estimating type and duration of prophylaxis for VTE specifically in patients with active cancer or who experienced surgery. Family history of VTE could be added to a prior VTE history to define a concept of clinical thrombophilia which is not necessarily related to carrying a known inherited risk factor.
authors.affiliation: Faculté de Médecine et des Sciences de la Santé de Brest, Université de Bretagne, Occidentale (UBO), Brest, France.
authors.forename: Soledad
authors.initials: S
authors.lastname: Noboa
authors.forename: Grégoire
authors.initials: G
authors.lastname: Le Gal
authors.forename: Karine
authors.initials: K
authors.lastname: Lacut
authors.forename: Bernard
authors.initials: B
authors.lastname: Mercier
authors.forename: Christophe
authors.initials: C
authors.lastname: Leroyer
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Nowak
authors.forename: Dominique
authors.initials: D
authors.lastname: Mottier
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Oger
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D005192:Family Health; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D011795:Surveys and Questionnaires; D054556:Venous Thromboembolism / Q000209:etiology* / Q000235:genetics*