When we take the Phytocannabinoids from the Cannabis plant and Ingest or inhale them, they are able to attach to our CB1 and CB2 Receptors and activate the ECS to signal an antitumorigenic warning. Impairing cancer development through inhibiting reproduction, metastasis, and tumor angiogenesis (formation of blood cells). When tumors can no longer form new blood cells to be able to grow, Autophagy and Apoptosis begins; A type of programmed cell death accomplished through self-digestion in such a way that surrounding healthy cells are not affected.
Long story short, Phytocannabinoids become the booster that our ECS needs to catch up to the pace of which cancer cells grow and metastasize. Or in other cases, if our ECS is deficient due to other diseases, genetic mutations etc, the Phytocannabinoids enable to ECS to begin working properly.