Titles and Affiliations
Professor and Chair
Department of Cancer Prevention and Control
Roswell Park Comprehensive Cancer Center
Areas of Focus
- Heredity & Ethnicity
- Lifestyle & Prevention
- Tumor Biology
Chi-Chen Hong, PhD, Roswell Park Comprehensive Cancer Center, Buffalo, New York
Understanding the molecular drivers of aggressive breast cancer in Black women and how these are different in white women.
Black women are 42 percent more likely to die of their breast cancer than white women. Those diagnosed with breast cancer are more likely to be younger than newly diagnosed white women and are two times more likely to be diagnosed with triple-negative breast cancer (TNBC), an aggressive subtype of the disease. Drs. Ambrosone and Hong are investigating several biological and lifestyle factors that may influence the incidence of TNBC in Black women. This work may provide new insights at the population level into why some women develop more aggressive breast tumors so that personalized prevention and treatment can be designed.
Progress Thus Far
The team is studying immune cells that are in and around breast tumors, and how these types of immune cells differ between more aggressive and less aggressive tumor subtypes and between Black women and white women. They showed that some tumors appear to have a strong immune response, but the cells are actually ‘exhausted’ and dysfunctional. These findings led to a large national study to see if patients with exhausted immune cells, particularly Black women, could benefit from immunotherapy, which can re-invigorate these exhausted cells. Drs. Ambrosone and Hong also found systemic differences in immune profiles in healthy women related to a variant in the DARC gene, which evolved in African populations and stimulates a strong immune response to fight malaria infection. They discovered that circulating levels of immune cells are determined by DARC genotypes and in the past year, showed that DARC genotypes are also linked to immune cells in tumors. Work is ongoing to investigate whether DARC genotypes are also associated with more aggressive breast cancer subtypes. and we are studying how the immune system can make tumors behave more aggressively.
In the coming year, Drs. Ambrosone and Hong will more deeply explore how DARC genotypes may be related to breast tumor aggressiveness. The team will also look at how immune processes within tumors as well as inherited differences in immune response may influence racial disparities in tumor aggressiveness as well as outcomes.
Dr. Ambrosone is a Distinguished Professor of Oncology, Chair of the Department of Cancer Prevention and Control, and Senior Vice President for Population Sciences at Roswell Park Comprehensive Cancer Center. She is also co-leader of the CCSG Population Sciences Program. She was formerly a member of NCI’s EPIC Study Section and the ACS’s study section on Carcinogenesis, Nutrition and the Environment, and has served on several special emphasis panels and SPORE reviews. She is former Senior Editor for Cancer Research, was a member of the Board of Scientific Advisors to the Director of the National Cancer Institute until 2012, and served on the Interagency Breast Cancer and Environmental Research Coordinating Committee, established by the US Secretary of Health and Human Services to examine the state of the science on breast cancer and the environment and provide recommendations for future directions in research.
Dr. Ambrosone’s research focuses on both the etiology of breast cancer and factors that influence recurrence and survival after breast cancer diagnosis. She leads a number of studies aimed at determining factors that could account for the high prevalence of more aggressive breast tumors among African-American women, and mechanisms underlying these associations. She is also involved in studies of genetic variability in cancer treatment outcomes (pharmacogenetics) and the potential effects of diet, supplements, and lifestyle factors during and after therapy on breast cancer treatment outcomes.