“Delta9-Tetrahydrocannabinol, the main active component of marijuana… Here, we show that intratumoral administration of Delta9-tetrahydrocannabinol… induced a considerable regression of malignant gliomas… Cannabinoid treatment did not produce any substantial neurotoxic effect… cannabinoids signal apoptosis (cell death/suicide) by a pathway involving cannabinoid receptors… These results may provide the basis for a new therapeutic approach for the treatment of malignant gliomas.”

‎”Remarkably, cannabinoids kill glioma cells selectively and can protect non-transformed glial cells from death…”

http://www.ncbi.nlm.nih.gov/pubmed/10700234