Hong Kong police and the Department of Health have arrested three people, including a doctor, in an operation linked to the alleged supply of unregistered injections. Authorities seized at least 1,600 items, although reports differed on the exact total and whether they should be described as vials or injections. None had been identified as WT1 injections, according to the reports.
A health centre reportedly promoted WT1 injections on social media in July 2026, claiming they could prevent various cancers.
Health Secretary Lo Chung-mau said there was no scientific evidence that WT1 injections prevent cancer and that the product was not formally registered for clinical use.
Officials were investigating whether the case involved fraud, including whether customers had received saline or vitamin injections instead of the WT1 products advertised by the premises. As of 5 September 2026, authorities had found no evidence that anyone had received a WT1 injection.
The seized items were described in reports as unregistered injections, vitamins or health products, and officials were still investigating their contents. Lo warned that injecting unregistered products could pose serious health risks, including contamination and bloodstream infection. No adverse-reaction cases linked to WT1 injections had been reported as of 5 September 2026.
Officials said some people who may have bought or received the injections could have been visitors from outside Hong Kong who had already left the city, although this remained unconfirmed. The investigation was continuing, including into what customers may have received.