RT Journal Article SR Electronic T1 Worldwide Regulatory Reliance: Launching A Pilot on A Chemistry, Manufacturing and Control Post Approval Change for A Vaccine JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP pdajpst.2023.012850 DO 10.5731/pdajpst.2023.012850 A1 Gastineau, Thierry A1 Ban, Cynthia A1 Basso, Ana A1 Brehme, Franziska A1 Silva, Ana Luisa A1 Faure, Olivier A1 Le Palaire, Lyne A1 Persaud, Priya A1 Rodriguez, Heraclio YR 2023 UL http://journal.pda.org/content/early/2023/11/16/pdajpst.2023.012850.abstract AB When an initial marketing authorization of a pharmaceutical product is granted, a substantial number of chemistry, manufacturing and control (CMC) post approval changes (PACs) have to be managed by the manufacturers. Despite efforts undertaken over the years by multiple regulatory jurisdictions, there is still heterogeneity in terms of regulatory requirements and timelines across national regulatory authorities (NRAs). This creates complexity in managing global CMC PACs, putting the supply of medical products at risk. Regulators have developed regulatory mechanisms which aim at accelerating the reviews and approvals of PACs by NRAs. The World Health Organization (WHO) is supporting the concept of ′reliance′ amongst NRAs which are encouraged to rely on the assessment completed by a ″high-performing authority″. The objective is to accelerate the overall process for PACs, ultimately fostering more equitable and timely access of medical products to populations who need them. With the support of Health Canada, WHO, Pan American Health Organization, and the Paul-Ehrlich-Institut, Sanofi has launched a pilot using the principles of reliance for a CMC PAC for a vaccine, with 21 NRAs who accepted to participate in the pilot. The objective of this pilot was to apply these principles to reduce the approval timeline to a maximum of 6 months, in all countries after an initial approval is granted by a reference authority. We discussed the opportunities and challenges of implementing reliance principles for CMC PACs. We also described the pilot experience, by sharing initial lessons learned from the Step 1 of this pilot, which consist of engaging the reference authority and the NRAs.