Ketamine could offer hope in the fight against cancer, scientists believe.
Promising laboratory tests showed the horse tranquiliser-cum-party drug could kill tumour cells.
Experts think it might block a receptor which encourages tumours to grow.
Although not proven to work on humans, the Imperial College London team hope similar results could be seen in further lab studies and among patients.
In-depth studies involving thousands of cancer patients would be needed before ketamine is ever rolled out as a treatment, however, meaning any development is still years away at best.
Ketamine is only licensed in the UK as an anaesthetic but can also be prescribed off-license as a pain killer.
These versions are medical-grade and proven to be safe.
However, they can still trigger hallucinations, just like the version sold on the streets for as little as £3 a pop.
Anyone caught in possession of the class B drug faces a five-year prison term and an unlimited fine.
As it stands, surgery, chemotherapy and radiotherapy are the most commonly used cancer treatments.
But researchers around the world are searching for other treatments in a bid to boost care and survival rates, with up to half of people expected to get the disease in their lifetime.
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