Factor VII coagulant activity, factor VII -670A/C and -402G/A polymorphisms, and risk of venous thromboembolism

J Thromb Haemost. 2007 Aug;5(8):1674-8. doi: 10.1111/j.1538-7836.2007.02620.x.


Background: Most epidemiological studies have found no association between levels of factor (F) VII:C and venous thromboembolism (VTE). Our Longitudinal Investigation of Thromboembolism Etiology (LITE) had, in contrast, reported an independent, increased risk of VTE after 7.8 years of follow-up for those with high baseline levels of FVII:C.

Objective: To confirm whether FVII:C is associated with VTE after 12.6 years of follow-up and to examine whether two FVII gene polymorphisms (-670A/C and -402G/A) are related to VTE occurrence.

Methods: In 19 091 LITE participants with no prior history of VTE or cancer, we measured FVII:C at baseline and identified 404 new VTEs. We also performed a nested case-control study to relate the polymorphisms to VTE (n = 490 without exclusion for cancer or prior VTE).

Results: FVII:C was not independently associated with VTE occurrence after extended follow-up. Multivariable-adjusted rate ratios for VTE were 1.00, 1.00, 0.94, 1.00, and 1.38 (P-trend = 0.48) for the <25th, 25th-49th, 50th-74th, 75th-94th, and >or=95th percentiles of FVII:C, respectively. The -670C and -402A alleles were in high linkage disequilibrium, and both were associated with greater FVII:C levels. However, neither polymorphism was associated with VTE occurrence.

Conclusion: After extended follow-up, LITE offers little evidence that a greater FVII level is a risk factor for VTE.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Alleles
  • Antigens / chemistry*
  • Coagulants / chemistry*
  • Factor VII / chemistry*
  • Factor VII / genetics*
  • Female
  • Genotype
  • Humans
  • Male
  • Polymorphism, Genetic*
  • Prospective Studies
  • Risk Factors
  • Thromboembolism / drug therapy
  • Thromboembolism / genetics*
  • Thromboembolism / prevention & control
  • Venous Thrombosis / drug therapy
  • Venous Thrombosis / genetics*
  • Venous Thrombosis / prevention & control


  • Antigens
  • Coagulants
  • factor VII clotting antigen
  • Factor VII