The use of cannabis as a treatment for cancer (and not simply to alleviate symptoms) appears increasingly promising, particularly in some forms of cancer. It contains antiangiogenic properties, which can help prevent the formation of new blood vessels needed by a tumor to continue growth. The neurotransmitter anandamide, which is associated with the CB1 and CB2 receptors — the same receptors that respond to cannabinoids from the cannabis plant — has been shown to inhibit human breast cancer cell proliferation.