There are substantial state variations in racial and ethnic disparities in triple-negative breast cancer (TNBC) incidence in the United States, according to a study published online March 2 in JAMA Oncology.
Hyuna Sung, Ph.D., from the American Cancer Society in Atlanta, and colleagues quantified between and within racial and ethnic disparities in TNBC incidence rates among U.S. women using data from the U.S. Cancer Statistics Public Use Research Database. The analysis included 133,579 women with TNBC diagnosed from 2015 through 2019.
The researchers found that the TNBC incidence rate was highest among Black women (25.2 per 100,000 women), followed by White (12.9 per 100,000), American Indian or Alaska Native (11.2 per 100,000), Hispanic (11.1 per 100,000), and Asian or Pacific Islander (9.0 per 100,000), with substantial variance observed in racial and ethnic group-specific and state-specific rates.
Within each racial and ethnic population, state variations were smaller but still substantial. Incident rate ratios (IRRs) were statistically significantly higher in 38 of 38 states among Black women versus White women. Black women in Delaware, Missouri, Louisiana, and Mississippi had the highest rates among all states and racial and ethnic populations. Compared with the national rate, IRRs varied from 0.72 in Utah to 1.18 in Iowa among White women.
“The findings suggest a role of social determinants of health in shaping the geographically patterned risk of TNBC and a need for more research to identify factors contributing to the state variations in disparity to develop effective preventive measures,” the authors write.
Hyuna Sung et al, State Variation in Racial and Ethnic Disparities in Incidence of Triple-Negative Breast Cancer Among US Women, JAMA Oncology (2023). DOI: 10.1001/jamaoncol.2022.7835
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