The Australian and New Zealand Clinical Trials Registry (ANZCTR) website, hosted by the University of Sydney, has been temporarily deactivated following a cyber security breach. The University of Sydney wrote to affected user accounts on Friday 28 February 2025 and this email outlined additional information and any actions affected users need to take.

Registration, updating trial details and changing user account details are not yet possible. If you are concerned about obtaining a prospective registration label for your trial on time, we recommend registering your trial on ClinicalTrials.gov or your closest WHO-recognised Primary Registry (see https://www.who.int/clinical-trials-registry-platform/network/primary-registries).

We apologise for this disruption. As soon as we have timeframes available, these will be shared on the website.