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Could Recent Decreases in Breast Cancer Incidence Really Be Due to Lower HRT Use? Trends in Attributable Risk for Modifiable Breast Cancer Risk Factors in Canadian Women
Beginning of article
ABSTRACT
Objectives: Recent downward trends in breast cancer incidence have been attributed to declining use of hormone replacement therapy (HRT). To determine whether this is a credible conclusion, this study calculated population attributable risk (PAR) for HRT and other modifiable breast cancer risk factors.
Methods: PAR calculation needs both the prevalence of a risk factor, and the relative risk (RR) for breast cancer incidence for that risk factor. Prevalences were calculated for Canadian women, aged 50-69, participating in the National Population Health Survey, 1994-2006. RR were derived from published research: 1.4 for HRT use, 1.4 for excessive alcohol use, 1.15 …
