COVID-19 VACCINE CLINICAL TRIAL CONCERNS

Announcements have been made that Moderna, the University of Oxford and AstraZeneca, and Johnson & Johnson independently of one another will begin testing proposed coronavirus vaccines in stage three trials beginning in July 2020. Related to the important matter of whether these attempts or any related investigations will yield products that protect against the onset of COVID-19 is the essential question of which kinds of individuals will benefit from this research. Key demographic characteristics, such as age, gender, and race/ethnicity help to distinguish one person from another. Unless the pool of participants in these clinical trials adequately reflects such differences, then the overall impact of any vaccine may be limited to representatives of groups taking part in such studies.

Major shortcomings presently exist in the composition of participants in clinical trials. As reported in the March 2020 issue of the journal Contemporary Clinical Trials Communications, adult participation in U.S. cancer clinical trials is at less than 10% of cancer patients, with even lower rates for racial and ethnic minority groups. For example, African Americans comprise 5% of patients enrolled in trials that support FDA approval of new drugs, while representing 13.3% of the general U.S. population. Cancer is the leading cause of death for Asian Americans, yet they comprise just 3% of cancer participants in clinical trials. Also, Hispanics represent less than 3% of participants in similar investigations, despite accounting for an estimated 17.8% of the U.S. population.

An under-representation of older adults in cancer clinical trials remains an ongoing concern. Consequently, optimal treatment in this group remains undefined. The January 2020 issue of the Journal of Geriatric Oncology describes challenges involving efforts to increase their level of participation. Older adult cancer patients, differ from younger adults since they often possess more comorbidities, take more medications, and have diminishing organ function, which often excludes them from clinical investigations. Furthermore, older adults enrolled in studies tend to be fitter and healthier than the average older patient seen in clinics, which leads to uncertainty about the risks, benefits, and tolerability of systemic therapies in the older population.

Potential barriers to enrollment of older adults in trials have been identified. One reason for non-accrual of older adults is due to trial unavailability or patient ineligibility. Strict exclusion criteria, especially those related to functional status, organ function, and comorbidities, which are common in older patients, can serve as major enrollment barriers.

Mortality data for victims of the COVID-19 epidemic show that some portions of the U.S. population have been devastated more than other demographic segments. Patients 80 years of age and older residing in long-term care facilities have been particularly hard hit. African American males also have died at significantly higher rates than their proportion of the population would suggest. Thus, it would be most prudent to ensure that stage three vaccine trials represent these groups adequately.

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COVID-19 VACCINE CLINICAL TRIAL CONCERNS

Indicates the importance of ensuring that key demographic groups experiencing the ravages of this disease are represented adequately in upcoming stage three clinical trials. Read More

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