Inhibitory effects of cannabinoid CB1 receptor stimulation on tumor growth and metastatic spreading: actions on signals involved in angiogenesis and metastasis.

  “Stimulation of cannabinoid CB1 receptors… inhibits the growth of a rat thyroid cancer cell-derived tumor…  also blocks the growth of tumors… the hypothesis that CB1 receptor stimulation interferes not only with angiogenesis but also with metastatic processes was tested in a widely used model of metastatic infiltration in vivo, the Lewis lung carcinoma… Our findings indicate that CB1 receptor agonists might be used therapeutically to retard tumor growth in vivo by inhibiting at once tumor growth, angiogenesis, and metastasis.”

http://www.ncbi.nlm.nih.gov/pubmed/12958205

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