Abstract P6-10-01: Results from NRG oncology/NSABP protocol DMP-1: Women's decision-making in breast cancer risk reduction

Background: Tamoxifen and raloxifene are two selective receptor modulators (SERMs) that have been shown to reduce the risk of developing breast cancer in women at increased risk of the disease. Both drugs are infrequently used in the general U.S. population. Increased knowledge about the risks and benefits of SERM use for breast cancer risk reduction does not lead to increased uptake of chemoprevention. We know little about what influences decision-making regarding breast cancer risk reduction with SERMs. Methods: To better understand what influences SERM decision-making for breast cancer risk reduction we conducted a survey study assessing social, environmental, and psychological factors that may influence a woman9s decision. Women who talked to a health care provider (HCP) about SERM use (N=1,023) received a questionnaire immediately after the HCP visit that asked about the counseling session, sociodemographics, experiences with breast cancer, breast cancer risk, and risk perception. After its completion a second survey was administered that inquired about issues surrounding medication intake such as attitudes about taking medicines in general, trust in pharmaceutical companies, and in their HCP. A statistical comparison of survey responses was performed between those who decided to take a SERM and those who decided not to take a SERM. Logistic regression was used to determine a key set of independent factors associated with the decision. Results: Of the 1,023 women, 716 made a decision about SERM intake (70%) and were included in the study. Of those, 324 (45%) decided to take a SERM and 392 (55%) decided not to take a SERM. Of SERM users 89.8% received a recommendation to take a SERM by the HCP compared to 44.4% of non-users. Only 15.7% of SERM users reported never having had a breast biopsy compared to 26.3% of non-users. Overall, SERM users had a higher breast cancer risk, risk perception, and worry about getting breast cancer. In multivariate analysis 11 factors were identified as having independent association with SERM use, including: recommendation from HCP, attitudes and perceptions regarding medication intake, influenced by someone9s breast cancer diagnosis, breast cancer worry, trust in HCP, a diagnosis of atypical hyperplasia, and others9 experiences with SERM intake. Women who had one or more first degree relatives with breast cancer were less likely to take a SERM. Neither breast cancer risk nor risk perception influenced SERM decision-making. Discussion: Factors that influence SERM decision-making are related to women9s personal experiences with breast cancer, their HCP, and attitudes towards medications. Conclusions: Social, environmental, and psychological factors proved to be more important for SERM decision-making than breast cancer risk or risk perception. In addition to presenting risks and benefits in counseling, the importance of personal experiences and attitudes for decision-making need to be considered to understand and support women9s decision-making on SERM use for breast cancer risk reduction. SUPPORT: U10CA37377, -69974; -180868, -180822; -189867. Citation Format: Holmberg C, Bandos H, Fagerlin A, Bevers TB, Battaglia TA, Wickerham DL, McCaskill-Stevens W. Results from NRG oncology/NSABP protocol DMP-1: Women9s decision-making in breast cancer risk reduction. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P6-10-01.