RT Journal
A1 Ness RB, Albano JD, McTiernan A, Cauley JA
T1 INfluence of estrogen plus testosterone supplementation on breast cancer
JF Archives of Internal Medicine
JO Archives of Internal Medicine
YR 2009
FD January 12
VO 169
IS 1
SP 41
OP 46
DO 10.1001/archinternmed.2008.507
UL http://dx.doi.org/10.1001/archinternmed.2008.507
AB Background 
    Concern that the use of exogenous testosterone may increase breast cancer risk coexists with rising use of this medication in the United States. We sought to examine the relationship between the use of estrogen plus testosterone (E + T) therapy (esterified estradiol plus methyltestosterone) and the occurrence of breast cancer.Methods 
    A total of 31 842 postmenopausal participants in the Women's Health Initiative Observational Study were followed for a mean of 4.6 years. At the 3-year visit, E + T users were compared with non–hormone therapy users for time to incident invasive breast cancer. Cox proportional hazards estimates were adjusted for known predictors of breast cancer including prior hormone use and screening mammography.Results 
    Thirty five women using E + T at visit 3 developed invasive breast cancer. Use of E + T had a nonsignificant impact on invasive breast cancer risk (adjusted hazard ratio, 1.42; 95% confidence interval, 0.95-2.11). The most commonly used E + T preparation, Estratest, was associated with a significant elevation in invasive breast cancer (adjusted hazard ratio, 1.78; 95% confidence interval, 1.05-3.01). However, rates of breast cancer were lower in longer-term E + T users than in shorter-term E + T users.Conclusion 
    Although our results have less strength than an initial report linking E + T to breast cancer, we found a modest, albeit nonsignificant, elevation in breast cancer risk associated with E + T use.