Cannabinoids may cause antitumor effects by various mechanisms, including induction of cell death, inhibition of cell growth, and inhibition of tumor angiogenesis and metastasis.
From 1977-78 he submitted nine separate proposals for research grants--including work on the controlled release of cancer drugs and the inhibition of angiogenesis--but was rejected by the National Institutes of Health and various foundations.
It is not just that hypertension drugs led to Viagra or that angiogenesis drugs led to the treatment of macular degeneration, but that even discoveries we claim come from research are themselves highly accidental.