“In the current study, we examined whether ligation of CB2 receptors would lead to induction of apoptosis in tumors of immune origin and whether CB2 agonist could be used to treat such cancers.

 Exposure of murine tumors EL-4, LSA, and P815 to delta-9-tetrahydrocannabinol (THC) in vitro led to a significant reduction in cell viability and an increase in apoptosis…

Culture of primary acute lymphoblastic leukemia cells with THC in vitro reduced cell viability and induced apoptosis.

Together, the current data demonstrate that CB2 cannabinoid receptors expressed on malignancies of the immune system may serve as potential targets for the induction of apoptosis. Also, because CB2 agonists lack psychotropic effects, they may serve as novel anticancer agents to selectively target and kill tumors of immune origin.”

http://bloodjournal.hematologylibrary.org/content/100/2/627.long

“We examined whether treatment of tumor-bearing mice with THC was effective at killing tumor cells in vivo… These data suggest that THC was effective in vivo to induce apoptosis and kill the tumor cells… THC treatment can cure tumor-bearing mice… they were completely cured…Taken together, these results suggest that THC can exert anticancer properties in vivo.” http://bloodjournal.hematologylibrary.org/content/100/2/627.long?sso-checked=1