Cannabis extracts combined with radiation therapy improve brain cancer treatment

21 November 2014

Research at St George's University of London has shown that when chemical extracts of cannabis are used to treat cancer tumours alongside radio therapy the growths can virtually disappear.

Cannabinoids are the active chemicals in cannabis. There are 85 known cannabinoids in the cannabis plant. Two of these, tetrahydrocannabinol (THC) and cannabidiol (CBD) were tested as part of the research into brain cancer.

Brain cancer is particularly difficult to treat and claims the lives of about 5,200 people in the UK each year. It also has a particularly poor prognosis as the rate of survival after five years of patients’ diagnosis is around 10%.

The new research is the first to show a drastic effect when combining THC and CBD with irradiation. Tumours growing in the brains of mice were drastically slowed down when THC/CBD was used with irradiation.

Dr Wai Liu, Senior Research Fellow and lead researcher on the project, said: “The results are extremely exciting. The tumours were treated in a variety of ways, either with no treatment, the cannabinoids alone, and irradiation alone or with both the cannabinoids and irradiation at the same time.

“Those treated with both irradiation and the cannabinoids saw the most beneficial results and a drastic reduction in size. In some cases, the tumours effectively disappeared in the animals. This augurs well for further research in humans in the future. At the moment this is a mostly fatal disease.

“The benefits of the cannabis plant elements were known before but the drastic reduction of brain cancers if used with irradiation is something new and may well prove promising for patients who are in gravely serious situations with such cancers in the future.”

The research team are discussing the possibility of combining cannabinoids with irradiation in a human clinical trial.

The research has been published in the journal Molecular Cancer Therapeutics.


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