ABSTRACT
Non-Hispanic Black breast cancer survivors have poorer outcomes and higher mortality rates than White survivors, but systemic biological mechanisms underlying these disparities are unclear. We used circulating leukocytes as a surrogate for measuring systemic mechanisms, which might be different from processes in the target tissue (e.g., breast). We investigated race-based differences in DNA damage and repair, using a novel CometChip assay, in circulating leukocytes from breast cancer survivors who had completed primary cancer therapy and were cancer free. We observed novel race-based differences in systemic DNA damage and repair activity in cancer survivors, but not in cells from healthy volunteers. Basal DNA damage in leukocytes was higher in White survivors, but Black survivors showed a much higher induction after bleomycin treatment. Double-strand break repair activity was also significantly different between the races, with cells from White survivors showing more sustained repair activity compared to Black leukocytes. These results suggest that cancer and cancer therapy might have long-lasting effects on systemic DNA damage and repair mechanisms that differ in White survivors and Black survivors. Findings from our preliminary study in non-cancer cells (circulating leukocytes) suggest systemic effects beyond the target site, with implications for accelerated aging-related cancer survivorship disparities.
ABSTRACT
INTRODUCTION: The Achieving Cancer Equity through Identification, Testing, and Screening (ACE-ITS) program is a community-engaged framework to improve mammography maintenance and rates of genetic risk assessment, counseling, and testing using a multilevel approach that enhances patient navigation through mobile health and community education. METHODS: The ACE-ITS program is based on the National Institute of Minority Health and Health Disparities research framework focused on the individual (genetic testing, screening navigation) and community (community-based breast health education) levels and targeted to the biological- (genetic risk), behavioral- (mammography screening), sociocultural- (underserved Black and Hispanic women), and the health care system (patient navigation, automated text messages)-related domains. We further integrate the Practical Robust Implementation and Sustainability Model to describe our program implementation. RESULTS: In collaboration with genetic counselors and community partners, we created educational modules on mammography maintenance and genetic counseling/testing that have been incorporated into the navigator-led community education sessions. We also implemented a universal genetic risk assessment tool and automated text message reminders for repeat mammograms into our mammography navigation workflow. Through the ACE-ITS program implementation, we have collaboratively conducted 22 educational sessions and navigated 585 women to mammography screening over the 2020-2021 calendar years. From January to December 2021, we have also conducted genetic risk assessment on 292 women, of whom 7 have received genetic counseling/testing. CONCLUSIONS: We describe a multilevel, community-engaged quality improvement program designed to reduce screening-related disparities in Black and Hispanic women in our catchment area.
