Accessibility of clinical study reports supporting medicine approvals: a cross-sectional evaluation

OBJECTIVES

Clinical study reports (CSRs) are highly detailed documents that play a pivotal role in medicine approval processes. Though not historically publicly available, in recent years, major entities including the European Medicines Agency (EMA), Health Canada, and the US Food and Drug Administration (FDA) have highlighted the importance of CSR accessibility. The primary objective herein was to determine the proportion of CSRs that support medicine approvals available for public download as well as the proportion eligible for independent researcher request via the study sponsor.

STUDY DESIGN AND SETTING

This cross-sectional study examined the accessibility of CSRs from industry-sponsored clinical trials whose results were reported in the FDA-authorized drug labels of the top 30 highest-revenue medicines of 2021. We determined (1) whether the CSRs were available for download from a public repository, and (2) whether the CSRs were eligible for request by independent researchers based on trial sponsors' data sharing policies.

RESULTS

There were 316 industry-sponsored clinical trials with results presented in the FDA-authorized drug labels of the 30 sampled medicines. Of these trials, CSRs were available for public download from 70 (22%), with 37 available at EMA and 40 at Health Canada repositories. While pharmaceutical company platforms offered no direct downloads of CSRs, sponsors confirmed that CSRs from 183 (58%) of the 316 clinical trials were eligible for independent researcher request via the submission of a research proposal. Overall, 218 (69%) of the sampled clinical trials had CSRs available for public download and/or were eligible for request from the trial sponsor.

CONCLUSION

CSRs were available from 69% of the clinical trials supporting regulatory approval of the 30 medicines sampled. However, only 22% of the CSRs were directly downloadable from regulatory agencies, the remaining required a formal application process to request access to the CSR from the study sponsor.

Improving clinical trial transparency at UK universities: Evaluating 3 years of policies and reporting performance on the European Clinical Trial Register

BACKGROUND

January 2019, the House of Commons' Science and Technology Committee sent letters to UK universities admonishing them to achieve compliance with results reporting requirements for Clinical Trials of Investigative Medicinal Products by summer 2019. This study documents changes in the clinical trial policies and Clinical Trials of Investigative Medicinal Product reporting performance of 20 major UK universities following that intervention.

METHODS

Freedom of Information requests were filed in June 2018 and June 2020 to obtain clinical trial registration and reporting policies covering both Clinical Trials of Investigative Medicinal Products and all other clinical trials. Two independent reviewers assessed policies against transparency benchmarks based on World Health Organization best practices. To evaluate universities' trial reporting performance, we used a public online tracking tool, the European Union Trials Tracker, which assesses universities' compliance with regulatory Clinical Trials of Investigative Medicinal Product disclosure requirements on the European Clinical Trial Register. Specifically, we evaluated whether universities were adhering to the European Union requirement to post summary results on the trial registry within 12 months of completion.

RESULTS

Mean policy strength increased from 2.8 to 4.9 points (out of a maximum of 7 points) between June 2018 and June 2020. In October 2018 the average percentage of due Clinical Trials of Investigative Medicinal Products that had results available on the European trial registry across university sponsors included in the cohort was 29%. By June 2021, this had increased to 91%, with 5 universities achieving a reporting performance of 100%. All 20 universities reported more than 70% of their due trial results on the European trial registry.

INTERPRETATION

Political pressure appears to have a significant positive impact on UK universities' clinical trial reporting policies and performance. Similar approaches could be used to improve reporting performance for other types of sponsors, other types of trials, and in other countries.

Missing clinical trial data: the evidence gap in primary data for potential COVID-19 drugs

Background

Several drugs are being repurposed for the treatment of the coronavirus disease 2019 (COVID-19) pandemic based on in vitro or early clinical findings. As these drugs are being used in varied regimens and dosages, it is important to enable synthesis of existing safety data from clinical trials. However, availability of safety information is limited by a lack of timely reporting of overall clinical trial results on public registries or through academic publication. We aimed to analyse the evidence gap in this data by conducting a rapid review of results posting on ClinicalTrials.gov and in academic publications to quantify the number of trials missing results for drugs potentially being repurposed for COVID-19.

Methods

ClinicalTrials.gov was searched for 19 drugs that have been identified as potential treatments for COVID-19. Relevant clinical trials for any prior indication were listed by identifier (NCT number) and checked for results and for timely result reporting (within 395 days of the primary completion date). Additionally, PubMed and Google Scholar were searched to identify publications of results not listed on the registry. A second, blinded search of 10% of trials was conducted to assess reviewer concordance.

Results

Of 3754 completed trials, 1516 (40.4%) did not post results on ClinicalTrials.gov or in the academic literature. Tabular results were available on ClinicalTrials.gov for 1172 (31.2%) completed trials. A further 1066 (28.4%) had published results in the academic literature, but did not report results on ClinicalTrials.gov. Key drugs missing clinical trial results include hydroxychloroquine (37.0% completed trials unreported), favipiravir (77.8%) and lopinavir (40.5%).

Conclusions

There is an important evidence gap for the safety of drugs being repurposed for COVID-19. This uncertainty could cause unnecessary additional morbidity and mortality during the pandemic. We recommend caution in experimental drug use for non-severe disease and urge clinical trial sponsors to report missing results retrospectively.