Abstract PD16-02: Factors Associated with Receipt of Digital Breast Tomosynthesis Among Racially/Ethnically Diverse Women Undergoing Screening Mammography
Authors: McGuinness Julia E. , Patel Gargi , Amenta Jacquelyn N. , Kukafka Rita , Crew Katherine D. 
Published: March 2023

Abstract
Introduction: Digital breast tomosynthesis (DBT) is increasingly utilized in breast cancer screening, including among women at high risk for breast cancer. While there is a lack of rigorous data from randomized controlled trials demonstrating superior efficacy compared to two-dimensional (2D) digital mammography, observational studies suggest that DBT might have lower rates of false-positive results and increased detection of invasive cancer than 2D mammography. However, uptake of DBT might be lower among racial/ethnic minorities, which could contribute to breast cancer disparities. We evaluated whether sociodemographic and breast cancer risk factors were associated with receipt of DBT vs. 2D mammography among a racially/ethnically diverse population of women undergoing screening mammography.
Methods: We conducted a respective cohort study among women, age 40-74 years, who underwent screening mammography at Columbia University Irving Medical Center (CUIMC) in New York, NY, from February 2020 to January 2022. We extracted data from the electronic health record (EHR) on age, race/ethnicity, first-degree family history of breast cancer (yes/no), prior breast biopsies (yes/no), and mammographic breast density (high vs. low), and calculated individual 5-year risks of invasive breast cancer according to the Breast Cancer Surveillance Consortium (BCSC) model. High risk was defined as a 5-year invasive breast cancer risk 1.67%. Our primary outcome was receipt of at least one DBT screening examination from 2020-2022 (yes/no). We conducted multivariable logistic regression analyses to assess the association between demographic/clinical factors and receipt of DBT.
Results: Among 5617 evaluable women, mean age was 55.4 years (SD, 9.5 years) and 56% identified as non-Hispanic White, 10% as non-Hispanic Black, 17% as Hispanic, 8% as Asian, and 9% other/unknown. Over 60% of women had high breast density, and 34% met high-risk criteria. Seventy percent of women had at least one DBT from 2020-2022. In multivariable analyses (Table 1), women with high vs. low breast density were 2.5 times more likely to receive DBT (odds ratio [OR]=2.51, 95% confidence interval [CI]=2.19-2.88), while first-degree family history of breast cancer, prior breast biopsy, and age were inversely associated with DBT. Racial/ethnic minorities were less than half as likely to undergo DBT compared to non-Hispanic Whites; for example, Hispanic women were over 85% less likely to receive DBT (OR=0.14, 95% CI=0.11-0.16). Overall, there was no association between breast cancer risk status (high vs. low/average) and receipt of DBT (OR=1.00, 95% CI 0.92-1.08).
Conclusion: We observed that the majority of women undergoing screening mammography at CUIMC from 2020-2022 received DBT for breast cancer screening. However, racial/ethnic minorities, including non-Hispanic Blacks and Hispanics, were significantly less likely than non-Hispanic Whites to have received DBT. Breast cancer risk according the BCSC model was also not associated with receipt of DBT. Future studies should determine which subsets of women are more likely to benefit from DBT.

Citation Format: Julia E. McGuinness, Gargi Patel, Jacquelyn N. Amenta, Rita Kukafka, Katherine D. Crew. Factors Associated with Receipt of Digital Breast Tomosynthesis Among Racially/Ethnically Diverse Women Undergoing Screening Mammography [abstract]. In: Proceedings of the 2022 San Antonio Breast Cancer Symposium; 2022 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2023;83(5 Suppl):Abstract nr PD16-02.