The European Medicines Agency (EMA) has published a concept paper on how it intends to draft a reflection paper on the use of external controls, such as through the collection of real-world data or derived from data from other trials or data sources, instead of using randomised controls to support the clinical evidence submitted in an application seeking authorisation of a treatment from the regulator. Currently, no guidance addresses this issue and there is not a standard definition of 'external controls'. Randomised controlled trials are considered the 'gold standard' for evaluating the benefits and risks of medicines in regulatory decision-making, there are circumstances where conclusions can be drawn from data collected under a clinical trial protocol where the control group was not randomised. In these circumstances, the external control may be derived from data from other clinical trials or real-world data (RWD). There is a need for more information on the methodological reliability and operational aspects of this approach. The Reflection Paper is intended to define what is meant by an external control; the appropriate clinical and regulatory setting and minimal requirements for external controls; operational and feasibility aspects; planning, design, conduct, analysis and reporting of studies for which external controls are used; and considerations to minimise bias. EMA said it plans to release a draft reflection paper for public consultation in the fourth quarter of 2026, followed by a three-month consultation, and to adopt a guideline in the second quarter of 2027. The concept paper was issued two months after the UK Medicines and Healthcare Products Regulatory Agency (MHRA) issued a draft guideline on a similar topic (LNB News 20/05/2025 18)