Resiniferatoxin is made from the sap of a Moroccan cactus-like plant. It is a plant that contains the chemical that makes chile peppers hot.
Researchers have tested resiniferatoxin (RTX) on dogs suffering with the severe pain of osteosarcoma. The chemical destroyed the pain-sensing nerves that control a type of heat-related inflammatory pain although it has no effect on the tumor.
The result has been that the dogs treated with RTX were able to function pain-free.
The injection burns temporarily so the dogs must be anthetized to receive it.
RTX is not a cancer cure, but it can relieve the excruciating pain of cancer. Tests are ongoing for use in humans as well.