The use of validated and nonvalidated surrogate endpoints in two European Medicines Agency expedited approval pathways: A cross-sectional study of products authorised 2011–2018


Autoři: Catherine Schuster Bruce aff001;  Petra Brhlikova aff002;  Joseph Heath aff003;  Patricia McGettigan aff001
Působiště autorů: William Harvey Research Institute, Queen Mary University of London, Charterhouse Square, London, United Kingdom aff001;  The Institute of Health and Society, Newcastle University, Newcastle upon Tyne, United Kingdom aff002;  Greater Manchester Mental Health NHS Foundation Trust, Prestwich, Manchester, United Kingdom aff003
Vyšlo v časopise: The use of validated and nonvalidated surrogate endpoints in two European Medicines Agency expedited approval pathways: A cross-sectional study of products authorised 2011–2018. PLoS Med 16(9): e32767. doi:10.1371/journal.pmed.1002873
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pmed.1002873

Souhrn

Background

In situations of unmet medical need or in the interests of public health, expedited approval pathways, including conditional marketing authorisation (CMA) and accelerated assessment (AA), speed up European Medicines Agency (EMA) marketing authorisation recommendations for medicinal products. CMAs are based on incomplete benefit-risk assessment data and authorisation remains conditional until regulator-imposed confirmatory postmarketing measures are fulfilled. For products undergoing AA, complete safety and efficacy data should be available, and postauthorisation measures may include only standard requirements of risk management and pharmacovigilance plans. In the pivotal trials supporting products assessed by expedited pathways, surrogate endpoints reduce drug development time compared with waiting for the intended clinical outcomes. Whether surrogate endpoints supporting products authorised through CMA and AA pathways reliably predict clinical benefits of therapy has not been studied systematically. Our objectives were to determine the extent to which surrogate endpoints are used and to assess whether their validity had been confirmed according to published hierarchies.

Methods and findings

We used European Public Assessment Reports (EPARs) to identify the primary endpoints in the pivotal trials supporting products authorised through CMA or AA pathways during January 1, 2011 to December 31, 2018. We excluded products that were vaccines, topical, reversal, or bleeding prophylactic agents or withdrawn within the study time frame. Where pivotal trials reported surrogate endpoints, we conducted PubMed searches for evidence of validity for predicting clinical outcomes. We used 2 published hierarchies to assess validity level. Surrogates with randomised controlled trials supporting the surrogate-clinical outcome relationship were rated as ‘validated’. Fifty-one products met the inclusion criteria; 26 underwent CMAs, and 25 underwent AAs. Overall, 26 products were for oncology indications, 10 for infections, 8 for genetic disorders, and 7 for other systems disorders. Five products (10%), all AAs, were authorised based on pivotal trials reporting clinical outcomes, and 46 (90%) were authorised based on surrogate endpoints. No studies were identified that validated the surrogate endpoints. Among a total of 49 products with surrogate endpoints reported, most were rated according to the published hierarchies as being ‘reasonably likely’ (n = 30; 61%) or of having ‘biological plausibility’ (n = 46; 94%) to predict clinical outcomes. EPARs did not consistently explain the nature of the pivotal trial endpoints supporting authorisations, whether surrogate endpoints were validated or not, or describe the endpoints to be reported in the confirmatory postmarketing studies. Our study has limitations: we may have overlooked relevant validation studies; the findings apply to 2 expedited pathways and may not be generalisable to products authorised through the standard assessment pathway.

Conclusions

The pivotal trial evidence supporting marketing authorisations for products granted CMA or AA was based dominantly on nonvalidated surrogate endpoints. EPARs and summary product characteristic documents, including patient information leaflets, need to state consistently the nature and limitations of endpoints in pivotal trials supporting expedited authorisations so that prescribers and patients appreciate shortcomings in the evidence about actual clinical benefit. For products supported by nonvalidated surrogate endpoints, postauthorisation measures to confirm clinical benefit need to be imposed by the regulator on the marketing authorisation holders.

Klíčová slova:

Medicine and health sciences – Oncology – Cancer treatment – Cancers and neoplasms – Hematologic cancers and related disorders – Myelomas and lymphoproliferative diseases – Myelomas – Clinical medicine – Clinical trials – Phase III clinical investigation – Phase II clinical investigation – Pharmacology – Drug research and development – Hematology – Plasma cell disorders – Gastroenterology and hepatology – Liver diseases – Chronic liver disease – Chronic hepatitis – Social sciences – Sociology – Communications – Marketing – Research and analysis methods – People and places – Geographical locations – Europe


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