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

Aaron R. Folsom, M. Cushman, S. R. Heckbert, T. Ohira, L. Rasmussen-Torvik, M. Y. Tsai

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

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 ≥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.

Original languageEnglish (US)
Pages (from-to)1674-1678
Number of pages5
JournalJournal of Thrombosis and Haemostasis
Volume5
Issue number8
DOIs
StatePublished - Aug 2007

Keywords

  • Blood coagulation factors
  • Factor VII
  • Prospective study
  • Pulmonary embolus
  • Venous thrombosis

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