Clinical trial diversity data show mismatch between enrollment and disease prevalence, GSK says
A lack of diversity in clinical trials has persisted despite decades of initiatives to try to turn the tide.
In a recent review of 17 years of clinical trials, drugmaker GSK found that there were some mismatches between the demographics of its US-based trials and how prevalent diseases were in those populations.
The results, the company says, will help GSK and others design studies that better represent epidemiological rates within races and ethnicities.
In the study, UK-based GSK looked at data from its drug trials spanning 2002 to 2019 and reviewed more than 100,000 US-based participants in 495 trials. The results were published Monday in Clinical Trials: Journal of the Society for Clinical Trials. The review compared trial enrollment to US demographics and to the share of each demographic group represented in a disease population, as some racial and ethnic groups are disproportionately affected by certain diseases.
The results were mixed. The company found that in trials for asthma drugs, Black/African Americans made up 22.6% of participants — exceeding the 13.4% they represent in the US population, as well as the 17% share of asthma patients comprised by Black/African Americans.
However, in HIV trials, enrollment of Black/African American participants was at 35.1%, higher than census levels of 13.4%. But it was significantly lower than the 55.3% share the group represents among HIV patients.
In COPD, 2.1% of Asians are impacted, according to epidemiology data — but GSK studies had only 0.4% representation. Hispanics/Latinos were also underrepresented — only 4.5% of participants in GSK’s COPD trials identified as Hispanic/Latino, but according to epidemiology data, they make up 6.5% of the disease population.
The study also found that across pharmaceutical trials, Asians and participants who marked they were of more than one race were the least represented. For vaccine trials, the most well-represented group was non-Hispanic whites, while the least represented group was Indigenous.
GSK said that by the end of 2022, all of its clinical trials had a “diversity plan” in place to make sure that the racial and ethnic groups most impacted by a disease were enrolled in the trial.
The company says that they are also now implementing “global cultural competency training” to 15,000 clinical trial staffers “to build trust, enhance disease awareness and provide appropriately tailored information.”
The lack of diversity in trials is not only on GSK’s radar.
In December, the Government Accountability Office released a report that found certain racial and ethnic groups, as well as adolescents, older adults, women, low-income individuals and individuals from rural communities, “remain consistently underrepresented in cancer clinical trials” — despite attempts to rectify those gaps.