NSABP Members' Area
  Password Protected - Access
  Limited to NSABP Participating
  Institutions Only

NSABP Foundation, Inc.

General NSABP Information
  Financial Conflicts of
     Interest Policy
  Coalition Comment:
  IOM Report Group Comment
  Contact the NSABP
  Pathology Section
  Future Meetings
  NSABP Newsletters
  Media Info on STAR

Clinical Trials Information
  Clinical Trials Overview
  Protocol Chart
  Never Say Lost

Treatment Trials Information
  Protocol B-51
  Protocol B-52
  Protocol B-53/S1207
  Protocol B-55/BIG 6-13

Prevention Trials Information
  Protocol P-1 - BCPT
  Protocol P-2 - STAR

Scientific Publications

Related Web Sites

Medical Search Engines

To report problems, ask
questions or make comments,
please send e-mail to:

Annotated Bibliography of NSABP Publications

Effect of Tamoxifen on Venous Thrombosis Risk Factors in Women Without Cancer: the Breast Cancer Prevention Trial
Cushman M, Costantino JP, Bovill EG, Wickerham DL, Buckley L, Roberts JD, Krag DN
British Journal of Hematology 120(1):109-116, January 2003

Tamoxifen reduces breast cancer incidence among healthy women, but is associated with an increased risk of venous thrombosis. We studied the 6 month effects of tamoxifen on venous thrombosis risk factors in women without cancer. One hundred and eleven women at one centre who were participants in a multicentre breast cancer prevention trial were randomized, in double-blind fashion, to receive 20 mg/d of tamoxifen or placebo. The activated protein C (APC) ratio and concentrations of antithrombin, protein C antigen, and total protein S were measured at baseline and 6 months of treatment. None of the factors changed over 6 months in placebo-treated women. Among tamoxifen-treated women, antithrombin and protein S, but not protein C or APC ratio were reduced. Sequential antithrombin concentrations with tamoxifen were 114% and 104% (P = 0.001 compared with placebo). Sequential protein S concentrations with tamoxifen were 18.42 and 17.30 micro g/ml (P = 0.02 compared with placebo). Reductions in antithrombin and protein S were greater in postmenopausal women, but did not differ by other risk factors for venous thrombosis, such as body mass index. Reductions of antithrombin and protein S, but not protein C or APC resistance, might relate to the increased risk of venous thrombosis associated with tamoxifen treatment.

Department of Medicine, University of Vermont, Burlington, VT, USA.