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e12583 Background: For women with certain high risk germline mutations, preventive surgical procedures (PSP) have been shown to reduce the risk of cancer. Uptake of these PSP, however, is highly variable among the population at risk. Rate of contralateral mastectomies is reported to be lower among African American (AA) and Asian women compared to Whites. Low socioeconomic status (SES) is reported to impact decision making concerning PSP, but the data remains scant due to associated low healthcare access. Our comprehensive cancer center is notable for providing state of the art care at a public safety net hospital, Harris Health System (HHS), where the population is > 80% racial and ethnic minorities, 60% uninsured and predominantly of low SES. Patients who meet the National Comprehensive Cancer Network (NCCN) guidelines for genetic testing are provided with the opportunity for counseling and testing. We therefore evaluated the likelihood of PSP among our patients with known germline mutations. Methods: We performed a retrospective chart review of a prospectively maintained database of patients who were offered genetic counseling and testing at HHS. We included patients diagnosed with high-risk mutations in BRCA1, BRCA2, PALB2, ATMand CHEK2 between 10/1/2009-09/30/2019 . We abstracted data on date of birth, race and ethnicity, history of breast cancer, breast cancer subtype, family history of breast or ovarian cancers. We collected data on whether the patients had undergone any PSP: bilateral or contralateral mastectomy, salpingectomy, or BSO. We used descriptive statistics to compare patient profiles in each mutation category. We performed univariate and multivariate logistic regression to evaluate whether differences in race, ethnicity, family history of breast or ovarian cancer, or personal history of breast cancer contributed to the likelihood of undergoing PSP. Results: Our dataset identified a total of 202 patients who had a pathogenic mutation in one of the genes above. This included 108 BRCA1, 57 BRCA2, 26 PALB2, 8 ATM and 4 CHEK2 mutation carriers. Sixty-one percent of the mutation carries identified as Hispanic, 18% as AA, 10% as White and 3% as Asian, 31% of the population never had a history of breast cancer. Sixty-three percent of the patients underwent at least one PSP. The results of the regression analysis identified personal history of breast cancer as the only predictor of undergoing PSP, OR 2.77, p = 0.002, which remained significant on the multivariate analysis with OR 4.4, p < 0.001. There were no statically significant findings with regards to race, ethnicity or family history of breast or ovarian cancers. Conclusions: Among our population racially diverse patients with low SES, history of breast cancer significantly increases the likelihood of opting to have prophylactic PSP. We will use this information to tailor our approach towards patient education and future quality improvement projects.

10587 Background: Identifying patients with hereditary breast cancer is critical since lifetime breast cancer risk is as high as 85% for those with germline BRCA1/2 mutations and preventive interventions can reduce that risk. However, genetic assessments and counseling are often underutilized among racial/ethnic minority populations. Reducing this genetic testing gap is important since hereditary breast/ovarian cancer syndromes occur among racial/ethnic minorities at least as frequently as non-Ashkenazi Jewish, non-Hispanic White populations. More information on variants in these populations is also needed to better define their genetic susceptibility. Methods: We conducted a retrospective study of adult patients evaluated for genetic testing for hereditary breast/ovarian cancer by a genetic counselor between October 1, 2009 and September 30, 2014 in Harris Health System which is a large, county health system composed mostly of underserved and minority patients. Data from 2015-2019 is currently being extracted and we are reporting the first 5 years of data. Descriptive statistics were used to summarize patient data. Results: 659 patients underwent genetic counseling (10.5% non-Hispanic White, 24.4% Black, 56.9% Hispanic, 5.9% Asian, and 2.3% other). Five patients had Ashkenazi Jewish ancestry. The majority of patients completed testing (87.4%) with 72.7% receiving financial assistance. Among those who did not complete testing, only 12.0% declined, while 66.3% did not meet guideline-based criteria or were recommended to have an affected relative tested. Multigene panel testing was not available until April 2014, so most underwent BRCA sequencing (75.0%) and/or a BRCA large rearrangement test (61.0%). 36.1% received multigene panel testing, 4.6% single site analysis, and 4.4% p53 sequencing. Deleterious mutations occurred in 98 (14.9%) patients: BRCA1 (n = 60), BRCA2 (n = 25), PALB2 (n = 7), ATM (n = 3), and other (n = 3). The distribution of races/ethnicities among those with deleterious mutations was similar to the overall population (7.1% non-Hispanic White, 18.4% Black, 69.4% Hispanic, 3.1% Asian, and 2.0% other). 80.6% of those with deleterious mutations had breast cancer. High rates of bilateral mastectomies were performed in patients with deleterious mutations: BRCA1 60%, BRCA2 55%, PALB2 57.1%, and ATM 33%. Risk-reducing salpingectomy or salpingo-oophorectomy was performed in 56.7% BRCA1, 60% BRCA2, 28.5% PALB2, and 33.3% other mutation carriers. Conclusions: We demonstrate that with the support of financial assistance programs, most patients who receive genetic counseling will accept genetic testing in a socioeconomically underserved, racially/ethnically diverse population. Identification of high-risk patients in these groups is critical since pathogenic variants in this population were common and more than half underwent risk-reducing procedures.