Which statement is true about registration and publication in clinical trials?

• A. All trials must be registered, but not all data are published
• B. Registration guarantees publication
• C. Publication occurs before registration
• D. Publishing is independent of results

Answer: (A)

The main idea is that registration and publication follow different paths: registering a trial is about transparency and accountability, while publication depends on the study actually being completed, analyzed, and deemed suitable for sharing. The best statement reflects that registration is required for trials, but many registered trials do not end up with published results. In other words, you can register a trial, but not all of those trials’ data make it into a published report. The other ideas are not correct because registration does not guarantee publication, publication usually happens after registration and after results are obtained, and publishing is not entirely independent of what the results show—journals and investigators weigh the outcomes when deciding what to publish.