Comprehensive analysis of primary immune thrombocytopenia clinical trials in the ClinicalTrials.gov database

Objective The purpose is to clarify the overall situation of clinical related to primary immune thrombocytopenia (ITP), to evaluate the difference between published clinical trials and unpublished trials, and to evaluate the relevant information of trial publication. Methods Search the ClinicalTrials.gov database on March 20, 2022 to identify ITP clinical trials and obtain relevant data. Publications in PubMed were searched using standardized methods to identify the publication of completed clinical trials. Results Of 341 trials identified, interventional trials were the most common (74.2%, n=253). Interventional trials and observational trials differ in the main research content (odds ratio (OR) 0.06, 95% confidence interval (CI) 0.03-0.015, P=0.000). In terms of published articles, there are few trials involving non drugs (OR 0.23, CI 0.08-0.64, P = 0.005). There were fewer trials with less than 10 participants (OR 1.52, CI 1.06-2.20, P = 0.024). Of the 167 completed trials, 93 (55.7%) were published and 48 (28.7%) uploaded results. Conclusion If the main research content involves drugs, trials with a larger number of people are more likely to be published. The publication rate of ITP clinical trials is high, but the submission rate of database results is low. Therefore, more attention should be paid to the submission of clinical trial results in the later stage.