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April 17, 2007

New Study Shows Marijuana Cuts Lung Cancer Tumor Growth In Half

Topics: Medicine

Researchers at Harvard University report that in-vivo and in-vitro studies show that Delta-tetrahydrocannabinol (THC), the active ingredient in marijuana, cuts tumor growth in common lung cancer in half and significantly reduces the ability of the cancer to spread:

Science Daily - ... this is the first set of experiments to show that the compound, Delta-tetrahydrocannabinol (THC), inhibits EGF-induced growth and migration in epidermal growth factor receptor (EGFR) expressing non-small cell lung cancer cell lines. Lung cancers that over-express EGFR are usually highly aggressive and resistant to chemotherapy.

THC that targets cannabinoid receptors CB1 and CB2 is similar in function to endocannabinoids, which are cannabinoids that are naturally produced in the body and activate these receptors. The researchers suggest that THC or other designer agents that activate these receptors might be used in a targeted fashion to treat lung cancer.

... Acting through cannabinoid receptors CB1 and CB2, endocannabinoids (as well as THC) are thought to play a role in variety of biological functions, including pain and anxiety control, and inflammation. Although a medical derivative of THC, known as Marinol, has been approved for use as an appetite stimulant for cancer patients, and a small number of U.S. states allow use of medical marijuana to treat the same side effect, few studies have shown that THC might have anti-tumor activity, Preet says. The only clinical trial testing THC as a treatment against cancer growth was a recently completed British pilot study in human glioblastoma.

... researchers first demonstrated that two different lung cancer cell lines as well as patient lung tumor samples express CB1 and CB2, and that non-toxic doses of THC inhibited growth and spread in the cell lines. "When the cells are pretreated with THC, they have less EGFR stimulated invasion as measured by various in-vitro assays,"...

Then, for three weeks, researchers injected standard doses of THC into mice that had been implanted with human lung cancer cells, and found that tumors were reduced in size and weight by about 50 percent in treated animals compared to a control group. There was also about a 60 percent reduction in cancer lesions on the lungs in these mice as well as a significant reduction in protein markers associated with cancer progression ...

Continue reading here.

As the Science Daily article points out, much work is needed to clarify the pathway by which THC functions, especially since some animal studies have shown that THC can stimulate some cancers. THC offers some promise, but the road to determine whether or not THC has true potential in cancer therapy is a long one.

Cross posted from New Hope Blog

Posted by Richard at April 17, 2007 10:58 PM



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