Researchers at the California Pacific Medical Center Research Institute are suggesting that a compound found in cannabis may stop breast  Cancer from metastasizing or spreading.
Cannabidiol, or CBD, could develop into a non-toxic alternative to
chemotherapy some years down the road, if animal and human trials bear
out its effectiveness. The article notes that smoking cannabis will not
deliver significant quantities of CBD.
Here is a summary of the medical publication abstract and reference: "Invasion and metastasis of aggressive breast cancer cells is the final and fatal step during cancer progression, and is the least understood genetically. Clinically, there are still limited therapeutic interventions for aggressive and metastatic breast cancers available. Clearly, effective and nontoxic therapies are urgently required. Id-1, an inhibitor of basic helix-loop-helix transcription factors, has recently been shown to be a key regulator of the metastatic potential of breast and additional cancers. Using a mouse model, we previously determined that metastatic breast cancer cells became significantly less invasive in vitro and less metastatic in vivo when Id-1 was down-regulated by stable transduction with antisense Id-1. It is not possible at this point, however, to use antisense technology to reduce Id-1 expression in patients with metastatic breast cancer. Here, we report that cannabidiol (CBD), a cannabinoid with a low-toxicity profile, could down-regulate Id-1 expression in aggressive human breast cancer cells. The CBD concentrations effective at inhibiting Id-1 expression correlated with those used to inhibit the proliferative and invasive phenotype of breast cancer cells. CBD was able to inhibit Id-1 expression at the mRNA and protein level in a concentration-dependent fashion. These effects seemed to occur as the result of an inhibition of the Id-1 gene at the promoter level. Importantly, CBD did not inhibit invasiveness in cells that ectopically expressed Id-1. In conclusion, CBD represents the first nontoxic exogenous agent that can significantly decrease Id-1 expression in metastatic breast cancer cells leading to the down-regulation of tumor aggressiveness." [Mol Cancer Ther 2007;6(11):2921–7]
What this means in English is that there is a bona fide plausible molecular mechanism whereby a cannabis derivative can directly inhibit the growth of aggressive and metastatic breast cancer cells. This is clearly VERY early animal data, and does not mean you should start consuming massive amounts of cannabis, pot, weed etc. Based on this, human trials are planned. Now that'll be a clinical trial to watch for!
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Last Updated ( Sunday, 10 February 2008 )
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Cancer Research and News 
