Dr. Sean McAllister and his colleagues at the California Pacific Medical Center Research Institute have discovered that CBD (cannabidiol) appears to be a very potent inhibitor of agressive and metastisized breast cancer [PDF].
Additionally, they have reported findings on the cumulative effect of CBD in blocking proliferation of brain-cancer cells: http://www.ncbi.nlm.nih.gov/pubmed/20053780, and on CBD’s mechanism of action in blocking breast-cancer metastasis: http://www.ncbi.nlm.nih.gov/pubmed/18025276.
Here’s more from Dr. McAllister:
Dr. McAllister is continuing his groundbreaking research on CBD and cancer at CPMCRI. Information on clinical trials being conducted may be found here.
Further research: New Study Finds Cannabis Compound Could Have Even Greater Reach in Inhibiting Aggressive Cancer than Previously Thought: http://www.cpmc.org/about/press/news2012/cannabis-brain.html