A Review of the Use of EQ-5D for Clinical Outcome Assessment in Health Technology Assessment, Regulatory Claims, and Published Literature.

The aim is to identify the extent to which EQ-5D is used as a clinical outcome assessment (COA) endpoint in a non-economic context in health technology assessment (HTA) decisions, regulatory labelling claims and published literature. Drug technology appraisals (TAs) published by HTA agencies in England, France, Germany and the USA between 2019 and 2021 were identified. Product labelling for drugs approved by the European Medicines Agency (EMA) and US Food and Drug Administration (FDA) between 2016 and 2021 were also identified. A systematic literature review (SLR) was also performed. Documents reporting EQ-5D in the context of economic evaluation only were excluded. EQ-5D data were reported for COA in 195 of 1072 (18%) published TAs, with the majority reported for Germany (n = 138). The EQ-5D visual analogue scale (EQ-VAS) was reported most frequently, in 68% of all TAs, and accounted for 100% of Institut für Qualität und Wirtschaftlichkeit im Gesundheitswesen (IQWiG) and 94% of Gemeinsamer Bundesausschuss (G-BA) TAs. In total, 320 drugs were approved or reviewed by the EMA and 735 by the FDA. Of these, 15 reported EQ-5D data from the EMA and 35 from the FDA; however, all EQ-5D data submitted to the FDA were reported in supporting documentation. Reporting of both EQ-5D index and EQ-VAS was most frequent, occurring in 32% of all documents. For the SLR, 329 of 4248 (8%) retrieved records were included. Reporting of both EQ-5D index and EQ-VAS was most frequent, occurring in 36% of studies. Clinical evaluation of recent drug approvals, based on regulatory, HTA and systematic literature reviews, demonstrated limited use of EQ-5D outside the context of economic evaluations. This may be due to the likelihood that the EQ-5D may lack sensitivity to detect improvement in conditions with small expected therapeutic benefit, or because the EQ-5D is not considered an adequate COA tool for clinical evaluation of treatment benefit. EQ-5D, as a COA, was more likely to be used in clinical evaluation of cancer drugs than drugs for treatment in any other disease category. HTA bodies were more likely to use the EQ-5D for COA, especially in Germany.