If an ISO 20387 accreditation program were launched, would existing certificates be cancelled?

Nothing requires it. Furthermore, the establishment of an accreditation scheme, in addition to the need for creation by a party or a regulatory text, requires the definition of a flexible accreditation scope, the drafting of reference documents, the identification of assessors, the solicitation of Committees… All these steps take time, during which the level of appropriation of ISO 20387 by French biobanks allows them to maintain a recognized leadership through their certification by a third-party body.