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Clinical trials have shown tamoxifen to be effective only in women with estrogen receptor (ER)-positive tumors. In a previous model, trends in the utilization of adjuvant therapy were modeled only as a function of age and stage of the disease and not ER status. In this paper, we integrate this previous estimate on the use of adjuvant systemic therapy for breast cancer in the United States with information on ER status from the Patterns of Care (POC) data to estimate the dissemination of adjuvant therapy for women with different ER-status tumors. We also summarize efficacy of adjuvant systemic therapy reported in the overviews of early breast cancer clinical trials. These two inputs, dissemination and efficacy, are key pieces for models that investigate the effect of breast cancer adjuvant therapy on the decline of U.S. breast cancer mortality.

journal of the national cancer institute. monographs

Chapter 2: Dissemination of Adjuvant Multiagent Chemotherapy and Tamoxifen for Breast Cancer in the United States Using Estrogen Receptor Information: 1975-1999