This October 2025 CRDSA white paper, External Controls—Evolving Regulatory Approaches, analyzes how MHRA, EMA, and FDA are approaching the regulatory use of externally controlled clinical trials. It compares the scope and intent of each agency’s draft guidance, highlighting MHRA’s broader inclusion of hybrid and augmented trial designs as a more flexible, patient-centered model. The paper also outlines implications for sponsors and regulators seeking globally harmonized standards, consistent evaluation frameworks, and reproducible methodologies.


This paper examines the benefits and challenges of using supplemental and external controls in regulatory submissions. Data platforms are an integral part of the ecosystem, enabling trial sponsors to access and use patient data from real-world settings and prior clinical trials. The paper recommends specific steps data platforms can take to support sponsors in meeting health authority expectations.
Innovative trial designs that make use of the totality of available evidence can reduce the burden on patients and meaningfully improve the drug development process. In February 2023, the FDA released for public comment “