Bulk download of UMIN-CTR dataset is available from here
Since WHO revised TRDS(Trial Registration Data Set) to version 1.3, summary results and IPD(individual clinical trial participant-level data) sharing statement of every clinical trial registration will be mandatory. UMIN-CTR will be adjusted to the new version soon. To share IPD, you can use UMIN ICDR(Individual Case Data Repository) service, that is linked with UMIN-CTR. For more information, refer to ICDR website.
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Search for clinical trials List of clinical trials that have been registered and open