Abstract P3-09-07: Breast cancer risk assessment in a multiethnic patient population
Authors: Park HL , Columbus A ,   Athena Breast Health Network Investigators and Advocate Partners, Kelly R , Alvarez A , Goodman D , Larsen K , Ziogas A , Anton-Culver H 
Published: February 2018

The United States Preventive Services Task Force recommends that women who are at increased risk for breast cancer and at low risk for adverse medication effects should be offered risk-reducing medications, such as tamoxifen or raloxifene, by their clinicians. In addition, the National Comprehensive Cancer Network recommends risk counseling for women with a 5-year risk of ≥1.7% as calculated by the NCI-developed Breast Cancer Risk Assessment Tool (BCRAT, based on the Gail model) or other risk model. Thus, breast cancer risk assessment is important for the identification of women at "high risk" who should be offered risk counseling and potentially intervention. The Athena Breast Health Network, which has served &gt;120,000 breast screening patients across California and the midwest, has integrated breast cancer risk assessment into its clinical breast screening programs. The goal of our study was to characterize breast cancer risk for &gt;10,000 mammography patients in the University of California Irvine Athena Breast Health Network, overall and by race/ethnicity, using several different risk models, including the BCRAT, BCSC, and IBIS models. Our cohort was comprised of 47% non-Hispanic White, 13% non-Hispanic Asian, 38% Hispanic, and 2% women of other race/ethnicities. Using data collected from electronic medical records and self-completed questionnaires, we determined that, as expected, non-Hispanic White and Asian women had higher breast cancer risk scores than Hispanic women for all risk models (5-year risks = 1.51-1.68% and 1.22-1.40% vs. 0.95-1.05%, respectively). In addition, when women were categorized as "increased risk" according to a given risk model if their 5-year risk score was ≥1.7%, the percentages of women at "increased risk" were higher in White women (26.5–42.2%) than in Asian (15.8–28.6%) and Hispanic (6.2–10.7%) women. However, the correlations between risk models were low to moderate in our cohort, overall (Pearson's r = 0.47-0.62) and especially for Asian women (Pearson's r = 0.29-0.49). Our results indicate that using only one risk model in a clinical breast cancer risk assessment program to identify "high risk" women would miss a significant proportion of women who would have been considered "high risk" according to another risk model. Conversely, some women who are identified as "high risk" according to one model may not need risk counseling and intervention since they are not considered "high risk" according to two other models. As our cohort expands and incident breast cancers occur, we will be able to determine which risk model or combination of risk models will have the highest discriminatory accuracy for predicting breast cancer risk in women of different race/ethnicities, which will enable our risk assessment programs to have a more targeted approach to risk counseling and intervention.

Citation Format: Park HL, Columbus A, Athena Breast Health Network Investigators and Advocate Partners, Kelly R, Alvarez A, Goodman D, Larsen K, Ziogas A, Anton-Culver H. Breast cancer risk assessment in a multiethnic patient population [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P3-09-07.