Table 6.
Clinical trial registers and search engines. In addition to the technical parameters and survey responses as introduced in Table 2, we report the scope of trial locations, the number of registered trials (
on 19 February 2021) and the availability of an option to search by molecular markers in each KB.
| Database | Source | Survey | Acad. use | API | Dump | Update interval | Scope |
Number of trials
|
Molecular markers |
|---|---|---|---|---|---|---|---|---|---|
| ClinicalTrials.gov | [129] | 80% | ✓ | ✓ | ✓ | 1 d | International | 367 846 | |
| PCM | [130] | 70% | ✓ | – | – | – | International | 314 | ✓ |
| EU-CTR | [131] | 50% | ✓ | – | – | – | EU | 39 147 | |
| DKTK Trial Register | [132] | 20% | ✓ | – | (✓) | 1 m | Germany | 1056 | ✓ |
| DRKS | [133] | 20% | ✓ | – | – | – | Germany | 11 354 |