Impossible to know treatment benefits without ethnoracial data
Penn Medicine
Dr. Junko Takeshita
Another investigator who has considered this issue, Junko Takeshita, MD, PhD, an assistant professor of dermatology at the University of Pennsylvania, Philadelphia, agreed.
“Lack of diversity among participants in phase 3 clinical trials for psoriasis is a problem,” said Dr. Takeshita, who led a study of racial differences in perceptions of psoriasis therapies that was published last year.
In that study, “my research group not only found differences in perceptions about biologics between Black and White patients with psoriasis, but we have also shown that Black patients with psoriasis are less likely to receive biologic treatment,” she reported. There are many explanations. For example, she found in another study that Black patients are underrepresented in direct-to-consumer advertisements for biologics.
This problem is not unique to psoriasis. Underrepresentation of Blacks and other ethnoracial groups is true of other skin diseases and many diseases in general, according to Dr. Takeshita. However, she cautioned that the 3% figure for Black participation in psoriasis trials reported by Mr. Reddy and colleagues is not necessarily reflective of trials in the United States.
“This study included international study sites that are recruiting patients from populations with different demographics than the U.S.,” she noted. By including sites with only Asian patients or countries with few Blacks in the population, it dilutes Black representation. She would expect the exact proportion of Black participants to be somewhat higher even if they are “still likely to be underrepresented” if the analysis has been limited to U.S. data.
The research had no funding source. Three of the nine authors reported financial relationships with pharmaceutical companies.
SOURCE: Reddy VD et al. Br J Dermatol. 2020 Sep 17. doi: 10.1111/bjd.19468.