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The need for a new keyword — “Trial registry-metaresearch” — to track certain uses of clinical trial registry records


Public clinical trial registries contain a large amount of information about a large number of trials. Academic researchers have conducted various analyses using such data. However, some of these studies do not concern the medical condition or intervention that is the focus of each trial. We list examples of publications that have performed such analyses. Currently, there is no keyword to track relevant publications. Here, we propose a novel keyword, “Trial registry-metaresearch”, that could be used in such publications. This would be a great help to researchers who wish to more systematically search the literature for such metaresearch.

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A public clinical trial registry holds the details of a large number of clinical trials. The World Health Organization recognizes almost 20 of these registries, which are hosted by various countries. Between them, these registries host several hundred thousand records [1], with the largest, of the USA, hosting almost 440,000. Although these records have been the subject of many diverse analyses, there is no systematic way to search for publications that capture such metaresearch. Here, I propose a new keyword that would aid researchers to do so.

A government may wish to have quantitative information of the use of the nation’s public clinical trial registry thus far. Other organizations that wish to support a registry may also find this information useful. Such funders may be interested in the number of users who access the registry and the number of pages viewed per day ([2], or the categories of people who access it (, for instance. Another angle would be to know how scholars have used the database. Elsewhere, I have pointed out that registries have been used for multiple types of analyses, relating to the dissemination of information, tracking scientific discoveries or biomedical applications, and so on [3]. In Table 1, I list one example of each of these various uses of such a registry. Each of these publications reports on metaresearch conducted across trial records in a registry, of a particular piece of information that is not related to a medical condition or intervention, for instance. That is, the analyses are independent of the specific nature of the trial that the record captures.

Table 1 Examples of various types of analyses performed with trial registry data, and a sample publication of each. The keywords linked to each publication are also listed

These categories of analysis - although sometimes with different wording - were outlined in an earlier commentary by the author [3]

However, there is no systematic way to search for publications that do such metaresearch. Even though all the publications listed above are examples of a certain type of analysis, there is no common keyword. In fact, of the 49 keywords, only three occur twice, and one occurs five times.

Therefore, I hereby propose a novel keyword, “Trial registry-metaresearch,” that would apply to studies of this type. Although possible tags include “Trials’ analysis,” “Across trials,” and “Registry analysis,” none of these keywords imply the exclusion of studies that concern a particular condition or intervention.

In a search on PubMed on 4 March 2023, the terms “trial registry-metaresearch” and “trial registry metaresearch” yielded 262,514 and four hits respectively. The first of these numbers is overwhelmingly large and the second is clearly inadequate. Putting the terms in quotation marks for the search did not solve the problem. This reflects the need to formally define the keyword. Just as the keywords in Table 1 are author-provided, I believe that researchers should submit the new keyword with their manuscripts. However, that will not be enough since even if interested colleagues help to spread the word through Twitter and mailing lists for instance, it will take time for the idea of the keyword to spread in the research community.

Although the proposed keyword cannot be included in The Medical Subject Headings (MeSH) thesaurus, which is used to index articles that are listed in PubMed, the staff of the Index Section of the Bibliographic Services Division of the National Library of Medicine (in the USA), work to improve the quality of searches [13]. I intend to be in touch with these staff about the proposed keyword. They would probably have a way to link this keyword to relevant publications even if the keyword has not been submitted by the authors.

In summary, I have proposed that a novel keyword is required to describe metaresearch of clinical trial registry records that do not pertain to a given medical issue or intervention. I believe that the consistent use of such a keyword would benefit those who wish to evaluate the many uses to which registry data has been put. It would also benefit researchers who wish to more systematically search the literature for what metaresearch has, or has not, been carried out.

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I thank Till Bruckner for comments on an earlier version of this Commentary.


This piece was not specifically funded. However, the author’s work is supported by internal funding from the Institute of Bioinformatics and Applied Biotechnology, from the Department of Electronics, IT, BT, and S&T of the Government of Karnataka, India.

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GS conceptualized this piece, wrote it, and takes full responsibility for it. The author(s) read and approved the final manuscript.

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Correspondence to Gayatri Saberwal.

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Saberwal, G. The need for a new keyword — “Trial registry-metaresearch” — to track certain uses of clinical trial registry records. Trials 24, 190 (2023).

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