Real-World Evidence Studies – What Are They and Why Are They Important?
Real-World Evidence (RWE) studies are research projects designed to evaluate the performance of therapies, medical devices, clinical procedures, or healthcare delivery models under real-world clinical practice conditions. Unlike traditional clinical trials, which follow a strictly defined protocol and often involve carefully selected patient populations, RWE studies are based on data collected during routine patient care.
Data sources used in Real-World Evidence research may include electronic health records (EHRs), patient registries, hospital and outpatient information systems, reimbursement and claims databases, physician observations, patient surveys, as well as data generated by medical applications and health-monitoring devices. These diverse sources provide a broader understanding of how a therapy or procedure performs outside the controlled environment of a clinical trial.
RWE studies are particularly valuable for evaluating the effectiveness and safety of treatments in everyday clinical practice. They make it possible to assess how therapies perform in patients with multiple comorbidities, older adults, diverse patient populations, or clinical situations that are not always fully represented in conventional clinical trials. They can also provide insights into patient adherence, quality of life, the incidence of adverse events, treatment costs, and the overall impact of a therapy on healthcare delivery.
Real-World Evidence does not replace clinical trials but serves as an essential complement to them. While clinical trials establish the efficacy and safety of an intervention under controlled conditions, RWE demonstrates how these findings translate into routine medical practice. As a result, RWE studies are increasingly used by pharmaceutical companies, medical device manufacturers, public institutions, healthcare payers, physicians, and organizations responsible for health technology assessment (HTA).
A Real-World Evidence study may be conducted either as a retrospective analysis of existing data or as a prospective observational study in which data are collected from patients and healthcare professionals over a defined period. In both approaches, careful study design, appropriate data source selection, data quality assurance, and compliance with legal and ethical requirements—including personal data protection regulations—are essential.
In practice, RWE studies help answer key questions that are highly relevant to patient care: Is the therapy being used according to clinical recommendations? What outcomes does it achieve in real-world settings? Does it improve patients' quality of life? What barriers affect its use? Which patient groups benefit the most from the treatment?
Ultimately, Real-World Evidence represents an approach that bridges scientific research with everyday clinical practice. It provides a deeper understanding of the real needs of patients, healthcare professionals, and healthcare systems while supporting evidence-based decision-making related to treatment strategies, reimbursement policies, medical product development, and healthcare organization.
