Abstract 2760: Impact of race and age on choice of surgery in newly diagnosed breast cancer patients who tested negative for BRCA 1/2 mutation

Abstract

Abstract Introduction: The benefit of bilateral mastectomies in breast cancer patients who test negative for a deleterious BRCA mutation has not been proven. In spite of this, a significant number of women with unilateral breast cancer who test negative for BRCA mutation choose bilateral mastectomies. We aimed to evaluate the role of age and race in such decision making. Methodology: Records of 323 patients referred to Cancer Genetics between January 01,2012 and June 30,2014 for pre-operative genetic evaluation were analyzed. This cohort consisted of patients with newly diagnosed breast cancer who met genetic testing criteria. Patients were excluded if their surgical records were not available, they declined genetic testing, they underwent surgery prior to their test results being available or they were positive for BRCA mutation. A total of 148 patients met our inclusion criteria and were evaluated for final analysis. Statistical analysis was performed using SPSS21. Results: Of the 148 women with breast cancer who tested negative for a deleterious BRCA mutation, 116(78%) were Caucasian, 9(6%) were African-American, 5(3%) were Asian, 4(3%) were Arab, 3(2%) were Indian, 2(2%) were American-Indian and 1(1%) was Hispanic. The race or ethnicity could not be identified in 8(5%) patients. A total of 47(32%) patients ultimately underwent bilateral mastectomies in this cohort. Of these, 40(27%) underwent bilateral mastectomies as their initial surgery while 7(5%) underwent bilateral mastectomies eventually after undergoing partial mastectomy or simple mastectomy initially. There was no statistically significant difference between the mean ages of the group that underwent bilateral mastectomy (48.9 yrs) and the group that underwent partial or simple mastectomy (49.1 yrs). All of the 8 patients with an unknown ethnicity underwent bilateral mastectomy. The rest of the mastectomies (39) were performed in Caucasian patients. None of the non-Caucasian patients underwent bilateral mastectomy. This difference was statistically significant (p<0.001). Conclusion: Our study demonstrates that a significant proportion(32%) of BRCA negative women with breast cancer undergo bilateral mastectomies. Furthermore, Caucasian patients with BRCA negative breast cancer are more likely to choose bilateral mastectomies than non-Caucasians. However, this result has to be interpreted with caution as our sample size of non-Caucasians was small(24). Considering our catchment population, this small sample brings concerns that a significant proportion of non-Caucasian patients may not be undergoing genetic testing despite meeting criteria. We did not find a significant impact of age on choice of surgery in BRCA negative women with breast cancer. Further studies with larger sample size are needed to better understand the role of race and age in access to genetic testing and surgical decision making. Citation Format: Siddhartha Yadav, Heidi Dreyfuss, Jennifer Fulbright, Ashley Reeves, Sarah Campian, Dana Zakalik. Impact of race and age on choice of surgery in newly diagnosed breast cancer patients who tested negative for BRCA 1/2 mutation. [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Res 2015;75(15 Suppl):Abstract nr 2760. doi:10.1158/1538-7445.AM2015-2760