In a recent update to their website, the national cancer institute have had added a list of studies which indicate the anti-tumor effects of cannabis.
The studies reveal how cannabis “may inhibit tumor growth by causing cell death, blocking cell growth, and blocking the development of blood vessels needed by tumors to grow” while also protecting normal, healthy cells.
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The institute, which is part of the US Department of Health, now advises that ‘cannabinoids may be useful in treating the side effects of cancer and cancer treatment’ by smoking, eating it in baked products, drinking herbal teas and even spraying it under the tongue.
The site lists other uses including: anti-inflammatory activity, blocking cell growth, preventing the growth of blood vessels that supply tumours, antiviral activity and relieving muscle spasms caused by multiple sclerosis.
The information page also explains how cancer cells in mice were killed when exposed to cannabis:
• Studies in mice and rats have shown that cannabinoids may inhibit tumor growth by causing cell death, blocking cell growth, and blocking the development of blood vessels needed by tumors to grow. Laboratory and animal studies have shown that cannabinoids may be able to kill cancer cells while protecting normal cells.
• A study in mice showed that cannabinoids may protect against inflammation of the colon and may have potential in reducing the risk of colon cancer, and possibly in its treatment.
• A laboratory study of delta-9-THC in hepatocellular carcinoma (liver cancer) cells showed that it damaged or killed the cancer cells. The same study of delta-9-THC in mouse models of liver cancer showed that it had antitumor effects. Delta-9-THC has been shown to cause these effects by acting on molecules that may also be found in non-small cell lung cancer cells and breast cancer cells.
• A laboratory study of cannabidiol (CBD) in estrogen receptor positive and estrogen receptor negative breast cancer cells showed that it caused cancer cell death while having little effect on normal breast cells. Studies in mouse models of metastatic breast cancer showed that cannabinoids may lessen the growth, number, and spread of tumors.
• A laboratory study of cannabidiol (CBD) in human glioma cells showed that when given along with chemotherapy, CBD may make chemotherapy more effective and increase cancer cell death without harming normal cells. Studies in mouse models of cancer showed that CBD together with delta-9-THC may make chemotherapy such as temozolomide more effective.
Back in April this year the US government’s National Institute on Drug Abuse (NIDA) also referenced studies that showed cannabis could shrink brain tumours by killing off cancer cells.
“Recent animal studies have shown that marijuana can kill certain cancer cells and reduce the size of others,” the NIDA report said. “Evidence from one animal study suggests that extracts from whole-plant marijuana can shrink one of the most serious types of brain tumours. Research in mice showed that these extracts, when used with radiation, increased the cancer-killing effects of the radiation.”
Despite the numerous, proven benefits of cannabis, the US federal government wants it to remain illegal. They still classifies marijuana as a Schedule 1 drug alongside heroin and ecstasy.