Health Secretary Lo Chung-mau said on 7 September 2026 that there was no clinical data showing that injections marketed as WT-1 could prevent or treat cancer. He said the purported cancer-prevention vaccine did not exist, describing the products as fraudulent, and said the authorities would enforce the law and trace their distribution.
The Health Department carried out surprise inspections of medical institutions offering products described as Wilms’ tumour 1, or WT-1, vaccines or injections. The products had reportedly been promoted to customers as being able to prevent several types of cancer.
One report said the department had searched 14 institutions and found illegal injections at several locations. Another report focused on an earlier surprise inspection of a medical centre claiming to provide WT-1 injections. The available reports do not establish how the two accounts are related.
Authorities seized 1,600 doses of injectable products, according to Lo. He said none was labelled WT-1, but that some items had originally been intended as laboratory reagents and were marked as unsuitable for human injection. There was also evidence that the products had been traded or sold.
At least three people were reportedly arrested, although the available report did not identify them or give details of any suspected offences or the progress of the cases. Lo said direct injection into the body could cause an infection if a product were contaminated. He added that the injections were regulated by the Pharmacy and Poisons Board.
The authorities said they would continue tracing where the injections had gone and urged people with information or concerns to report them. The sources did not say whether the 1,600 doses came from all 14 institutions, disclose the products’ ingredients or origins, or confirm whether any had been injected into people.