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Can Cannabis Slow The Growth Of Cancer?

Q: What is it about marijuana that slows the spread of breast cancer? It sounds far-fetched.  Is there anything to it?

A: You probably heard about a study from California showing that a substance in marijuana appears to turn off the activity of a gene that promotes the spread of breast cancer cells.  But don’t assume that you can get enough of it from smoking marijuana to have this effect.

thc cbd cancer marijuana cannabisThe compound is cannabidiol ( CBD ).  In the study at California Pacific Medical Center Research Institute, CBD inhibited the activity of a gene called Id-1, which the researchers think is responsible for metastasis–the process by which cancer cells spread from the original tumour to other sites in the body.  Id-1 genes are involved in development of the human embryo, but then go on “hold” and stay that way unless cancer develops.  Then, they can become active and trigger the spread of the disease.

In addition to its ability to block the activity of Id-1 genes, the marijuana compound is said to be far less toxic than the drugs now used for cancer treatment, and therefore may be better tolerated than chemotherapy and, perhaps, radiation therapy.  And, no, it doesn’t have the psychoactive effects of marijuana itself: if it is ever used on patients, they won’t get high.

Much more research remains to be done before CBD could be used to treat breast cancer.  So far, studies have been done only in the lab.  CBD has yet to be tested against any type of animal or human breast cancer.  While these findings are interesting, they’re very preliminary.

Dr.  Andrew weil is the founder and director of the Arizona Center for Integrative Medicine at the University of Arizona.  He is an internationally recognized expert on medicinal plants, alternative medicine and the reform of medical education.  Readers who wish to ask Dr.  Weil a question may do so by visiting

Source: Calgary Herald (CN AB)
Copyright: 2009 Canwest Publishing Inc.