Zhao Y, Mokliatchouk O, Ramia NF, Naylor ML, Butts CL. Pharmacokinetics/pharmacodynamics by race: Analysis of a peginterferon β-1a phase 1 study.
MED 2022;
3:612-621.e3. [PMID:
35853458 DOI:
10.1016/j.medj.2022.06.006]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 04/28/2022] [Accepted: 06/17/2022] [Indexed: 10/17/2022]
Abstract
BACKGROUND
Black/African American participants are underrepresented in clinical trials for multiple sclerosis but can experience a greater burden of disease than other racial groups in the United States. A phase 1, open-label, crossover study that demonstrated bioequivalence of subcutaneous and intramuscular injection of peginterferon β-1a in healthy volunteers enrolled similar proportions of Black and White participants, enabling a post hoc subgroup analysis comparing these groups.
METHODS
Peginterferon β-1a (125 μg) was administered by subcutaneous or intramuscular injection, followed by a washout period before a second injection using the alternative method. The primary pharmacokinetic and pharmacodynamic endpoints were maximum observed concentration (Cmax) and area under the concentration-time curve from hour 0 to infinity (AUCinf) of study drug and serum concentration of neop-terin, respectively. Safety and tolerability were included as secondary endpoints.
FINDINGS
This analysis included 70 (51.5%) Black and 59 (43.3%) White participants. Peginterferon β-1a Cmax was 29.8% higher in Black than in White participants following subcutaneous administration but was similar following intramuscular administration. Mean AUCinf was 31.0% and 11.8% greater in Black than in White participants with subcutaneous and intramuscular administration, respectively. Pharmacodynamics and safety signals were similar between groups, although Black participants reported numerically fewer adverse events.
CONCLUSIONS
No clinically meaningful differences were identified between Black and White participants related to peginterferon β-1a administration, supporting the approved dose of 125 μg/mL peginterferon β-1a. Future clinical studies should include sufficiently diverse populations to ensure accurate assessments of treatment response.
FUNDING
Funding for medical writing support was provided by Biogen (Cambridge, MA, USA).
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