It is known in the clinical research world that disparities exist when it comes to clinical trials participation. In fact in some sectors of research this represents a significant problem including Alzheimer's Disease, Oncology, etc. Moreover there is plenty of research that minority groups such as African Americans and Latinos generally receive inferior health care services to other groups. There is a horrible legacy to overcome--although decades ago there are still memories such as the Tuskegee experiments; see https://en.wikipedia.org/wiki/Tuskegee_syphilis_experiment. There is a significant body of research addressing lack of African American (and minority or persons of color) participation in clinical research trials --we include some references for reader's review below.
African-American Participation in Clinical Trials: Situating Trust and Trustworthiness
Recruitment of African-Americans to National Oncology Clinical Trials through a Clinical Trial Shared Resources
Challenging Assumptions About Minority Participation in Clinical Research
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