Re-consent practices in biobanks in Japan: current status and stakeholder perspectives.

Pediatric research in rare diseases relies on sharing biological specimens, clinical data, and analytical information among researchers. Re-consent is essential in longitudinal biobank (BB) research to ensure that pediatric participants remain informed and willing to continue. However, the issue of re-consent-obtaining consent once participants reach adulthood-remains a significant ethical concern. This study examined the current practices of re-consent acquisition in Japanese BBs and explores stakeholder opinions regarding genomic data sharing. A survey of 41 BBs revealed that only 25% of those handling pediatric samples obtained re-consent, all via written informed consent. Although 71% of respondents recognized the necessity of re-consent, the methods used to obtain it varied. Stakeholders identified ethical and logistical challenges, including privacy concerns and administrative burden. Various re-consent methods were suggested, with preferences depending on feasibility and ethical considerations. The findings highlight the need for policy discussions to balance data-sharing benefits with participant rights and privacy protection in pediatric genomic research. Determining optimal re-consent methods requires continued stakeholder engagement, including research participants and the public.